Canker Sores: What's going on with your canker sores right now?

Commonly suggested options include curcumin, hyaluronic acid, berberine, sage (Salvia officinalis), propolis and vitamin B12 (Cobalamin).

Canker Sores: What kind of help would you actually stick with?

Commonly suggested options include curcumin, hyaluronic acid, vitamin B12 (Cobalamin), berberine, sage (Salvia officinalis) and licorice root (Glycyrrhiza glabra).

Canker Sores: natural remedies and the evidence behind them

21 options · 6 graded B · 5 graded C · 10 traditional or ungraded

What's going on with your canker sores right now?

I've got an active sore and want it to heal as fast as possible

Curcumin
Supported by smaller clinical studies· Centuries of traditional use (Evidence grade B · Traditional use long-standing)Long-standing traditional staple
Soothes active ulcer pain and inflammation
Why it may be relevant
When you have a sore right now, curcumin's anti-inflammatory action targets the local pain and redness directly.
Why try it
Supported by a systematic review of small clinical trials suggesting topical curcumin may reduce canker sore pain and shorten healing time.
Dose or use
Follow product labeling; consult a healthcare practitioner.
Time to results
Typically 3–7 days per episode
Key study
Systematic review (2021, PMID 34331693): The Clinical Use of Curcumin for the Treatment of Recurrent Aphthous Stomatitis: A Systematic Review of Clinical Trials.
Caution
May interact with blood thinners; use topical forms cautiously if on medications.
Hyaluronic acid
Supported by smaller clinical studies (Evidence grade B · No traditional record)
Forms a protective film over the open ulcer
Why it may be relevant
When you have an active sore, topical hyaluronic acid forms a physical barrier over the ulcer, which small clinical trials suggest may support faster healing.
Why try it
Supported by a systematic review of small clinical trials suggesting topical hyaluronic acid may reduce ulcer size and pain in recurrent aphthous stomatitis.
Dose or use
Apply topical oral gel directly to the sore 2–3 times daily; follow product labeling.
Time to results
Typically 3–7 days per episode
Key study
Systematic review (2021, PMID 34542725): Efficacy of hyaluronic acid for recurrent aphthous stomatitis: a systematic review of clinical trials.
Caution
Check with your healthcare provider before starting, especially if you are pregnant or breastfeeding, take prescription medication, or manage a chronic condition.
Berberine
Supported by smaller clinical studies· Recognised traditional use (Evidence grade B · Traditional use recognised)Recognised traditional use
Topical gel tested for active ulcer healing
Why it may be relevant
Berberine gel has been evaluated in a randomized placebo-controlled trial for active canker sore treatment, making it relevant when you need relief now.
Why try it
Supported by an RCT showing berberine gelatin may reduce pain and promote healing of active aphthous ulcers.
Dose or use
Follow product labeling; consult a healthcare practitioner.
Time to results
Typically 3–7 days per episode
Key study
RCT (2013, PMID 23246229): Effects of berberine gelatin on recurrent aphthous stomatitis: a randomized, placebo-controlled, double-blind trial in a Chinese cohort.
Caution
Avoid during pregnancy; may interact with certain medications.
Sage (Salvia officinalis)
Supported by smaller clinical studies (Evidence grade B · No traditional record)
Topical sage gel tested against standard treatment
Why it may be relevant
A double-blind trial compared sage gel directly to a standard oral corticosteroid for active canker sores, making it a good fit when you're dealing with one right now.
Why try it
Supported by clinical research showing sage gel may reduce pain and healing time in active aphthous ulcers.
Dose or use
Apply sage-based oral gel to the sore as directed on product labeling.
Time to results
Typically 4–7 days per episode
Key study
RCT (2023, PMID 36934268): The effect of sage (Salvizan gel) compared to triamcinolone acetonide on the treatment of recurrent aphthous stomatitis: a double-blinded randomized clinical trial.
Caution
Avoid high-dose sage internally during pregnancy.
Propolis
Limited human trials so far· Most of the research is laboratory or animal work (Evidence grade C · No traditional record)
Natural antimicrobial applied directly to sores
Why it may be relevant
Propolis applied topically to an active sore leverages its antimicrobial and anti-inflammatory properties, evaluated in a pilot study for canker sore relief.
Why try it
Supported by a pilot study suggesting propolis may reduce pain and duration of active aphthous ulcers.
Dose or use
Apply topical propolis preparation directly to sore; follow product labeling.
Time to results
Typically 3–7 days per episode
Key study
RCT (2007, PMID 17285269): The effect of bee propolis on recurrent aphthous stomatitis: a pilot study.
Caution
Avoid if allergic to bee products or balsam of Peru.

One is stinging right now — I mainly want the pain calmed and the spot protected

Hyaluronic acid
Supported by smaller clinical studies (Evidence grade B · No traditional record)
Forms a protective film over the open ulcer
Why it may be relevant
When you have an active sore, topical hyaluronic acid forms a physical barrier over the ulcer, which small clinical trials suggest may support faster healing.
Why try it
Supported by a systematic review of small clinical trials suggesting topical hyaluronic acid may reduce ulcer size and pain in recurrent aphthous stomatitis.
Dose or use
Apply topical oral gel directly to the sore 2–3 times daily; follow product labeling.
Time to results
Typically 3–7 days per episode
Key study
Systematic review (2021, PMID 34542725): Efficacy of hyaluronic acid for recurrent aphthous stomatitis: a systematic review of clinical trials.
Caution
Check with your healthcare provider before starting, especially if you are pregnant or breastfeeding, take prescription medication, or manage a chronic condition.
Vitamin B12 (Cobalamin)
Supported by smaller clinical studies (Evidence grade B · No traditional record)
Topical B12 tested for active ulcer pain relief
Why it may be relevant
When you have a sore right now, vitamin B12 applied directly to the ulcer was tested in a placebo-controlled trial and may ease pain while the sore settles.
Why try it
Supported by a small randomized, double-blind, placebo-controlled trial in which topical vitamin B12 relieved aphthous ulcer pain more than placebo.
Dose or use
Apply an oral-grade vitamin B12 gel or ointment directly to the sore as directed on the product label; ask a provider about systemic B12 if you suspect a deficiency.
Time to results
Typically 2-7 days per episode
Key study
Randomized Controlled Trial (2015, PMID 26025792): The Effectiveness of Vitamin B12 for Relieving Pain in Aphthous Ulcers: A Randomized, Double-blind, Placebo-controlled Trial.
Caution
Topical use is generally well tolerated; if you suspect an underlying B12 deficiency, ask your provider to test your level rather than self-dosing high-dose supplements.
Licorice root (Glycyrrhiza glabra)
Centuries of traditional use· Limited human trials so far (Evidence grade C · Traditional use long-standing)Long-standing traditional staple
Bioadhesive patch soothes and protects ulcers
Why it may be relevant
Licorice extract in bioadhesive patch form has been clinically evaluated for active canker sore management, making it most relevant when a sore is present.
Why try it
Supported by clinical research on bioadhesive patches containing licorice extract for managing active recurrent aphthous stomatitis.
Dose or use
Follow product labeling for oral patches; consult a healthcare practitioner.
Time to results
Typically 4–7 days per episode
Key study
Clinical trial (2009, PMID 18853400): The efficacy of the bioadhesive patches containing licorice extract in the management of recurrent aphthous stomatitis.
Caution
Avoid long-term high-dose internal licorice with high blood pressure or heart conditions.
Aloe Vera Topical
Centuries of traditional use· Limited human trials so far (Evidence grade C · Traditional use long-standing)Long-standing traditional staple
Soothing gel applied straight to the sore
Why it may be relevant
When you have a sore right now, dabbing oral-grade aloe vera gel on it may calm the sting and cover the area while the ulcer runs its course.
Why try it
A 2022 meta-analysis of randomized trials in oral ulcers found aloe vera gel improved overall clinical response, though it did not significantly beat controls on pain or ulcer size, so it is best used as a gentle, low-risk soother rather than a proven remedy.
Dose or use
Apply a small amount of oral-grade aloe vera gel directly to the sore 2-3 times daily.
Time to results
Typically 3-7 days per episode
Key study
Meta-analysis of randomized controlled trials (2022, PMID 36504087): pooled data from 9 trials in oral ulcers showed better overall clinical efficacy with aloe vera gel but no statistically significant benefit for pain or ulcer size, so the evidence is mixed.
Caution
Use a product intended for oral use; don't swallow skin-only aloe gels, and stop if irritation develops.
Saltwater Rinse
Centuries of traditional use· Human evidence not yet assessed (Evidence grade not assigned · Traditional use long-standing)Long-standing traditional staple
Simple rinse to clean and calm the ulcer
Why it may be relevant
When you have a sore right now, a warm saltwater rinse can gently clean the area and ease discomfort while it heals.
Why try it
A traditional, low-cost first-line home remedy that helps keep the sore clean and may soothe inflammation.
Dose or use
Dissolve about 1/2 teaspoon of salt in a cup of warm water; swish for 15-30 seconds and spit, a few times a day.
Time to results
Soothing right away; a few days for the sore to heal
Key study
A traditional first-line home rinse for oral wounds; supportive self-care rather than a proven medical treatment.
Caution
Rinse and spit - don't swallow; overly strong salt solutions can sting or irritate the sore.

They keep coming back — I want fewer flare-ups over time

Zinc
Supported by smaller clinical studies (Evidence grade B · No traditional record)
May help reduce recurrent episodes
Why it may be relevant
Zinc supplementation has been evaluated in a systematic review for both preventing and managing recurrent aphthous stomatitis, making it well-suited for frequent sufferers.
Why try it
A systematic review of small clinical trials suggests zinc supplementation may help reduce recurrences and support episode management, particularly when zinc levels are low.
Dose or use
15–30 mg elemental zinc daily with food; long-term use above 40 mg/day warrants practitioner oversight.
Time to results
Typically 4–8 weeks
Key study
Systematic review (2021, PMID 34146924): Zinc supplementation for prevention and management of recurrent aphthous stomatitis: a systematic review.
Caution
Long-term high-dose zinc can deplete copper; take with food to reduce nausea.
Beta-glucan
Limited human trials so far· Most of the research is laboratory or animal work (Evidence grade C · No traditional record)
Immune modulator studied for canker sore reduction
Why it may be relevant
Beta-glucan's immune-modulating properties fit an immune support strategy, and it has been evaluated in a clinical study specifically for recurrent aphthous stomatitis.
Why try it
Supported by clinical research showing beta-glucan may help modulate immune response to reduce canker sore episodes.
Dose or use
Follow product labeling; consult a healthcare practitioner.
Time to results
Typically 4–8 weeks
Key study
RCT (2009, PMID 19216661): The effect of beta-glucan on recurrent aphthous stomatitis.
Caution
Generally well tolerated; consult a doctor if immunocompromised.
Vitamin D
Limited human trials so far· Most of the research is laboratory or animal work (Evidence grade C · No traditional record)
Low vitamin D is associated with more flare-ups
Why it may be relevant
If sores keep coming back, checking your vitamin D is worthwhile: a meta-analysis found vitamin D deficiency is associated with recurrent aphthous stomatitis, so correcting a documented shortfall may support the immune regulation involved.
Why try it
Based on observational evidence linking low vitamin D status to higher recurrence; correcting a confirmed deficiency may help, though supplementation has not been proven in trials to reduce recurrence.
Dose or use
1,000–2,000 IU daily is a common maintenance range; higher doses require practitioner guidance.
Time to results
Typically 4–12 weeks
Key study
Systematic review (2023, PMID 37426194): vitamin D deficiency is associated with recurrent aphthous stomatitis. This is an association, not proof that supplementing reduces recurrence.
Caution
High doses can cause toxicity; check levels with a healthcare provider before supplementing.
Acupuncture
Centuries of traditional use· Human evidence not yet assessed (Evidence grade not assigned · Traditional use long-standing)Long-standing traditional staple
Traditional support for recurring oral flare-ups
Why it may be relevant
For those experiencing frequent recurrence, acupuncture is traditionally used to address underlying imbalances thought to contribute to recurring oral ulcers.
Why try it
Traditionally used in Chinese medicine to support immune balance and reduce the frequency of recurring mucosal conditions like canker sores.
Dose or use
Seek a licensed acupuncturist; sessions typically weekly, course length individualized.
Time to results
Typically 4–8 weeks of regular sessions
Key study
Traditionally used for this condition; this specific use has not been confirmed in controlled clinical trials.
Caution
Ensure practitioner uses sterile single-use needles; inform them of any bleeding disorders or medications.
Probiotics (Lactobacillus plantarum P8)
Not yet assessed· We have not reviewed the literature for this one (Evidence grade not assigned · Traditional use recognised)Recognised traditional use
Gut-immune support to help cut down flares
Why it may be relevant
Supporting the gut-immune axis with a probiotic fits an immune-and-gut approach to reducing how often canker sores appear.
Why try it
Probiotics are studied for gut and immune support, and this is an emerging, low-risk option; strain-specific proof for this exact product in canker sores has not been confirmed in controlled trials.
Dose or use
Follow product labeling; consult a healthcare practitioner.
Time to results
Typically 4–8 weeks
Key study
General gut-immune support; there is no controlled trial confirming this specific Lactobacillus plantarum P8 product reduces recurrent aphthous stomatitis. Evidence for probiotics in this use is still emerging.
Caution
Generally well tolerated; those who are immunocompromised should consult a doctor first.
LI4 (Hegu) - Large Intestine 4
Centuries of traditional use· Human evidence not yet assessed (Evidence grade not assigned · Traditional use long-standing)Long-standing traditional staple
Traditional acupressure point for face and mouth
Why it may be relevant
If sores keep coming back, LI4 is the classic point traditionally used for face and mouth complaints and may be a gentle self-care adjunct between flares.
Why try it
Traditionally used in Chinese medicine for face, mouth, and dental discomfort; offered as a low-risk complementary practice, not a proven treatment.
Dose or use
Press the fleshy web between thumb and index finger for 1-2 minutes, a few times a day.
Time to results
Varies; used as an ongoing traditional adjunct
Key study
Traditionally used in Chinese medicine for face and mouth complaints; this specific use has not been confirmed in controlled clinical trials.
Caution
Avoid firm LI4 pressure during pregnancy, as it is traditionally contraindicated.

I suspect a hidden nutrient gap is what's triggering mine

Multivitamin (whole food)
Not yet assessed· We have not reviewed the literature for this one (Evidence grade not assigned · Traditional use recognised)Recognised traditional use
General nutrient cover if a specific gap is likely
Why it may be relevant
If you suspect a nutritional gap, a whole-food multivitamin gives broad coverage while you sort out which nutrient may be short, but it is a general fallback, not a targeted fix.
Why try it
A reasonable general option only if you have or suspect a documented nutrient shortfall; a placebo-controlled trial did not find an overall benefit for canker sores, so this is supportive rather than a proven treatment.
Dose or use
Follow product labeling; take with food for best absorption.
Time to results
Typically 4–8 weeks
Key study
Not evidence-backed as a canker sore treatment: a placebo-controlled RCT found no overall reduction in frequency or duration. Better used to cover a documented, specific gap while you check targeted nutrients (B12, iron, folate, zinc) with your provider.
Caution
Choose reputable whole-food forms; avoid mega-dose formulas without practitioner guidance.
Iron Deficiency
Centuries of traditional use· Human evidence not yet assessed (Evidence grade not assigned · Traditional use long-standing)Long-standing traditional staple
Low iron is a well-known ulcer trigger
Why it may be relevant
If you suspect a nutrient gap, iron is worth checking: iron deficiency is a recognized driver of recurrent mouth ulcers and can show up as cracks at the corners of the mouth.
Why try it
If you're low in iron, correcting a confirmed deficiency may reduce flare frequency; this is a root-cause check, not a direct treatment.
Dose or use
Ask your healthcare provider for a ferritin level and a full iron panel.
Time to results
Typically 8-16 weeks after correcting a confirmed deficiency
Key study
Correcting a documented shortfall can support recovery; this is a root-cause check, not a treatment claim - ask your provider to test your levels.
Caution
Don't start iron without a blood test; excess iron is harmful and supplements can cause stomach upset.
Vitamin B12 (Cobalamin) Deficiency
Centuries of traditional use· Human evidence not yet assessed (Evidence grade not assigned · Traditional use long-standing)Long-standing traditional staple
Low B12 is a classic canker-sore trigger
Why it may be relevant
If you suspect a nutrient gap, checking your B12 is a high-value step: low B12 is one of the most consistently reported nutritional links to recurrent mouth ulcers.
Why try it
If you're low in B12, correcting a confirmed deficiency may reduce how often sores appear; this is a root-cause check rather than a stand-alone treatment.
Dose or use
Ask your healthcare provider for a serum B12 test (and MMA/homocysteine if borderline).
Time to results
Typically 8-16 weeks after correcting a confirmed deficiency
Key study
Correcting a documented shortfall can support recovery; this is a root-cause check, not a treatment claim - ask your provider to test your levels.
Caution
This is a root-cause check, not a treatment; don't self-dose high B12 without testing, and confirm the level with your provider.
Vitamin B9 (Folic Acid) Deficiency
Centuries of traditional use· Human evidence not yet assessed (Evidence grade not assigned · Traditional use long-standing)Long-standing traditional staple
Low folate rounds out the trigger triad
Why it may be relevant
If you suspect a nutrient gap, folate is the third of the classic trio (with iron and B12) to check, and it is commonly screened together with them for recurrent mouth ulcers.
Why try it
If you're low in folate, correcting a confirmed deficiency may help reduce recurrences; this is a root-cause check, not a stand-alone treatment.
Dose or use
Ask your healthcare provider for a serum or red-cell folate test.
Time to results
Typically 8-16 weeks after correcting a confirmed deficiency
Key study
Correcting a documented shortfall can support recovery; this is a root-cause check, not a treatment claim - ask your provider to test your levels.
Caution
Folate supplements can mask a B12 deficiency; test both before correcting either.
Vitamin D Deficiency
Centuries of traditional use· Human evidence not yet assessed (Evidence grade not assigned · Traditional use long-standing)Long-standing traditional staple
Low D is a common hidden trigger
Why it may be relevant
If you suspect a nutritional gap, checking your vitamin D level is a practical first step — if you're low, correcting it may help reduce how often sores appear.
Why try it
If you're low in vitamin D, correcting the deficiency can support the immune balance that helps keep canker sores at bay.
Dose or use
Ask your healthcare provider for a 25-OH vitamin D blood test.
Time to results
Typically 8–16 weeks after correcting deficiency
Key study
Correcting a documented shortfall can support recovery; this is a root-cause check, not a treatment claim — ask your provider to test your levels.
Caution
Supplementation doses should be guided by test results and a practitioner.
Zinc Deficiency
Centuries of traditional use· Human evidence not yet assessed (Evidence grade not assigned · Traditional use long-standing)Long-standing traditional staple
Zinc gap is a well-recognized canker-sore trigger
Why it may be relevant
For those suspecting a nutritional cause, checking zinc status is key — if you're low, correcting it may directly reduce flare frequency.
Why try it
If you're low in zinc, correcting the deficiency can support wound healing and immune function in the oral mucosa.
Dose or use
Ask your healthcare provider about a serum zinc test.
Time to results
Typically 6–12 weeks after correcting deficiency
Key study
Correcting a documented shortfall can support recovery; this is a root-cause check, not a treatment claim — ask your provider to test your levels.
Caution
Avoid self-prescribing high-dose zinc without testing; excess zinc is harmful.

What kind of help would you actually stick with?

I'd rather dab a gel or patch right on the sore

Curcumin
Supported by smaller clinical studies· Centuries of traditional use (Evidence grade B · Traditional use long-standing)Long-standing traditional staple
Soothes active ulcer pain and inflammation
Why it may be relevant
When you have a sore right now, curcumin's anti-inflammatory action targets the local pain and redness directly.
Why try it
Supported by a systematic review of small clinical trials suggesting topical curcumin may reduce canker sore pain and shorten healing time.
Dose or use
Follow product labeling; consult a healthcare practitioner.
Time to results
Typically 3–7 days per episode
Key study
Systematic review (2021, PMID 34331693): The Clinical Use of Curcumin for the Treatment of Recurrent Aphthous Stomatitis: A Systematic Review of Clinical Trials.
Caution
May interact with blood thinners; use topical forms cautiously if on medications.
Hyaluronic acid
Supported by smaller clinical studies (Evidence grade B · No traditional record)
Forms a protective film over the open ulcer
Why it may be relevant
When you have an active sore, topical hyaluronic acid forms a physical barrier over the ulcer, which small clinical trials suggest may support faster healing.
Why try it
Supported by a systematic review of small clinical trials suggesting topical hyaluronic acid may reduce ulcer size and pain in recurrent aphthous stomatitis.
Dose or use
Apply topical oral gel directly to the sore 2–3 times daily; follow product labeling.
Time to results
Typically 3–7 days per episode
Key study
Systematic review (2021, PMID 34542725): Efficacy of hyaluronic acid for recurrent aphthous stomatitis: a systematic review of clinical trials.
Caution
Check with your healthcare provider before starting, especially if you are pregnant or breastfeeding, take prescription medication, or manage a chronic condition.
Vitamin B12 (Cobalamin)
Supported by smaller clinical studies (Evidence grade B · No traditional record)
Topical B12 tested for active ulcer pain relief
Why it may be relevant
When you have a sore right now, vitamin B12 applied directly to the ulcer was tested in a placebo-controlled trial and may ease pain while the sore settles.
Why try it
Supported by a small randomized, double-blind, placebo-controlled trial in which topical vitamin B12 relieved aphthous ulcer pain more than placebo.
Dose or use
Apply an oral-grade vitamin B12 gel or ointment directly to the sore as directed on the product label; ask a provider about systemic B12 if you suspect a deficiency.
Time to results
Typically 2-7 days per episode
Key study
Randomized Controlled Trial (2015, PMID 26025792): The Effectiveness of Vitamin B12 for Relieving Pain in Aphthous Ulcers: A Randomized, Double-blind, Placebo-controlled Trial.
Caution
Topical use is generally well tolerated; if you suspect an underlying B12 deficiency, ask your provider to test your level rather than self-dosing high-dose supplements.
Berberine
Supported by smaller clinical studies· Recognised traditional use (Evidence grade B · Traditional use recognised)Recognised traditional use
Topical gel tested for active ulcer healing
Why it may be relevant
Berberine gel has been evaluated in a randomized placebo-controlled trial for active canker sore treatment, making it relevant when you need relief now.
Why try it
Supported by an RCT showing berberine gelatin may reduce pain and promote healing of active aphthous ulcers.
Dose or use
Follow product labeling; consult a healthcare practitioner.
Time to results
Typically 3–7 days per episode
Key study
RCT (2013, PMID 23246229): Effects of berberine gelatin on recurrent aphthous stomatitis: a randomized, placebo-controlled, double-blind trial in a Chinese cohort.
Caution
Avoid during pregnancy; may interact with certain medications.
Sage (Salvia officinalis)
Supported by smaller clinical studies (Evidence grade B · No traditional record)
Topical sage gel tested against standard treatment
Why it may be relevant
A double-blind trial compared sage gel directly to a standard oral corticosteroid for active canker sores, making it a good fit when you're dealing with one right now.
Why try it
Supported by clinical research showing sage gel may reduce pain and healing time in active aphthous ulcers.
Dose or use
Apply sage-based oral gel to the sore as directed on product labeling.
Time to results
Typically 4–7 days per episode
Key study
RCT (2023, PMID 36934268): The effect of sage (Salvizan gel) compared to triamcinolone acetonide on the treatment of recurrent aphthous stomatitis: a double-blinded randomized clinical trial.
Caution
Avoid high-dose sage internally during pregnancy.
Licorice root (Glycyrrhiza glabra)
Centuries of traditional use· Limited human trials so far (Evidence grade C · Traditional use long-standing)Long-standing traditional staple
Bioadhesive patch soothes and protects ulcers
Why it may be relevant
Licorice extract in bioadhesive patch form has been clinically evaluated for active canker sore management, making it most relevant when a sore is present.
Why try it
Supported by clinical research on bioadhesive patches containing licorice extract for managing active recurrent aphthous stomatitis.
Dose or use
Follow product labeling for oral patches; consult a healthcare practitioner.
Time to results
Typically 4–7 days per episode
Key study
Clinical trial (2009, PMID 18853400): The efficacy of the bioadhesive patches containing licorice extract in the management of recurrent aphthous stomatitis.
Caution
Avoid long-term high-dose internal licorice with high blood pressure or heart conditions.

I'm fine taking a daily supplement to prevent the next one

Zinc
Supported by smaller clinical studies (Evidence grade B · No traditional record)
May help reduce recurrent episodes
Why it may be relevant
Zinc supplementation has been evaluated in a systematic review for both preventing and managing recurrent aphthous stomatitis, making it well-suited for frequent sufferers.
Why try it
A systematic review of small clinical trials suggests zinc supplementation may help reduce recurrences and support episode management, particularly when zinc levels are low.
Dose or use
15–30 mg elemental zinc daily with food; long-term use above 40 mg/day warrants practitioner oversight.
Time to results
Typically 4–8 weeks
Key study
Systematic review (2021, PMID 34146924): Zinc supplementation for prevention and management of recurrent aphthous stomatitis: a systematic review.
Caution
Long-term high-dose zinc can deplete copper; take with food to reduce nausea.
Beta-glucan
Limited human trials so far· Most of the research is laboratory or animal work (Evidence grade C · No traditional record)
Immune modulator studied for canker sore reduction
Why it may be relevant
Beta-glucan's immune-modulating properties fit an immune support strategy, and it has been evaluated in a clinical study specifically for recurrent aphthous stomatitis.
Why try it
Supported by clinical research showing beta-glucan may help modulate immune response to reduce canker sore episodes.
Dose or use
Follow product labeling; consult a healthcare practitioner.
Time to results
Typically 4–8 weeks
Key study
RCT (2009, PMID 19216661): The effect of beta-glucan on recurrent aphthous stomatitis.
Caution
Generally well tolerated; consult a doctor if immunocompromised.
Vitamin D
Limited human trials so far· Most of the research is laboratory or animal work (Evidence grade C · No traditional record)
Low vitamin D is associated with more flare-ups
Why it may be relevant
If sores keep coming back, checking your vitamin D is worthwhile: a meta-analysis found vitamin D deficiency is associated with recurrent aphthous stomatitis, so correcting a documented shortfall may support the immune regulation involved.
Why try it
Based on observational evidence linking low vitamin D status to higher recurrence; correcting a confirmed deficiency may help, though supplementation has not been proven in trials to reduce recurrence.
Dose or use
1,000–2,000 IU daily is a common maintenance range; higher doses require practitioner guidance.
Time to results
Typically 4–12 weeks
Key study
Systematic review (2023, PMID 37426194): vitamin D deficiency is associated with recurrent aphthous stomatitis. This is an association, not proof that supplementing reduces recurrence.
Caution
High doses can cause toxicity; check levels with a healthcare provider before supplementing.
Probiotics (Lactobacillus plantarum P8)
Not yet assessed· We have not reviewed the literature for this one (Evidence grade not assigned · Traditional use recognised)Recognised traditional use
Gut-immune support to help cut down flares
Why it may be relevant
Supporting the gut-immune axis with a probiotic fits an immune-and-gut approach to reducing how often canker sores appear.
Why try it
Probiotics are studied for gut and immune support, and this is an emerging, low-risk option; strain-specific proof for this exact product in canker sores has not been confirmed in controlled trials.
Dose or use
Follow product labeling; consult a healthcare practitioner.
Time to results
Typically 4–8 weeks
Key study
General gut-immune support; there is no controlled trial confirming this specific Lactobacillus plantarum P8 product reduces recurrent aphthous stomatitis. Evidence for probiotics in this use is still emerging.
Caution
Generally well tolerated; those who are immunocompromised should consult a doctor first.

Start me with simple, low-cost home remedies

Propolis
Limited human trials so far· Most of the research is laboratory or animal work (Evidence grade C · No traditional record)
Natural antimicrobial applied directly to sores
Why it may be relevant
Propolis applied topically to an active sore leverages its antimicrobial and anti-inflammatory properties, evaluated in a pilot study for canker sore relief.
Why try it
Supported by a pilot study suggesting propolis may reduce pain and duration of active aphthous ulcers.
Dose or use
Apply topical propolis preparation directly to sore; follow product labeling.
Time to results
Typically 3–7 days per episode
Key study
RCT (2007, PMID 17285269): The effect of bee propolis on recurrent aphthous stomatitis: a pilot study.
Caution
Avoid if allergic to bee products or balsam of Peru.
Aloe Vera Topical
Centuries of traditional use· Limited human trials so far (Evidence grade C · Traditional use long-standing)Long-standing traditional staple
Soothing gel applied straight to the sore
Why it may be relevant
When you have a sore right now, dabbing oral-grade aloe vera gel on it may calm the sting and cover the area while the ulcer runs its course.
Why try it
A 2022 meta-analysis of randomized trials in oral ulcers found aloe vera gel improved overall clinical response, though it did not significantly beat controls on pain or ulcer size, so it is best used as a gentle, low-risk soother rather than a proven remedy.
Dose or use
Apply a small amount of oral-grade aloe vera gel directly to the sore 2-3 times daily.
Time to results
Typically 3-7 days per episode
Key study
Meta-analysis of randomized controlled trials (2022, PMID 36504087): pooled data from 9 trials in oral ulcers showed better overall clinical efficacy with aloe vera gel but no statistically significant benefit for pain or ulcer size, so the evidence is mixed.
Caution
Use a product intended for oral use; don't swallow skin-only aloe gels, and stop if irritation develops.
Saltwater Rinse
Centuries of traditional use· Human evidence not yet assessed (Evidence grade not assigned · Traditional use long-standing)Long-standing traditional staple
Simple rinse to clean and calm the ulcer
Why it may be relevant
When you have a sore right now, a warm saltwater rinse can gently clean the area and ease discomfort while it heals.
Why try it
A traditional, low-cost first-line home remedy that helps keep the sore clean and may soothe inflammation.
Dose or use
Dissolve about 1/2 teaspoon of salt in a cup of warm water; swish for 15-30 seconds and spit, a few times a day.
Time to results
Soothing right away; a few days for the sore to heal
Key study
A traditional first-line home rinse for oral wounds; supportive self-care rather than a proven medical treatment.
Caution
Rinse and spit - don't swallow; overly strong salt solutions can sting or irritate the sore.

I want to get tested and fix the root cause, not just treat sores

Multivitamin (whole food)
Not yet assessed· We have not reviewed the literature for this one (Evidence grade not assigned · Traditional use recognised)Recognised traditional use
General nutrient cover if a specific gap is likely
Why it may be relevant
If you suspect a nutritional gap, a whole-food multivitamin gives broad coverage while you sort out which nutrient may be short, but it is a general fallback, not a targeted fix.
Why try it
A reasonable general option only if you have or suspect a documented nutrient shortfall; a placebo-controlled trial did not find an overall benefit for canker sores, so this is supportive rather than a proven treatment.
Dose or use
Follow product labeling; take with food for best absorption.
Time to results
Typically 4–8 weeks
Key study
Not evidence-backed as a canker sore treatment: a placebo-controlled RCT found no overall reduction in frequency or duration. Better used to cover a documented, specific gap while you check targeted nutrients (B12, iron, folate, zinc) with your provider.
Caution
Choose reputable whole-food forms; avoid mega-dose formulas without practitioner guidance.
Iron Deficiency
Centuries of traditional use· Human evidence not yet assessed (Evidence grade not assigned · Traditional use long-standing)Long-standing traditional staple
Low iron is a well-known ulcer trigger
Why it may be relevant
If you suspect a nutrient gap, iron is worth checking: iron deficiency is a recognized driver of recurrent mouth ulcers and can show up as cracks at the corners of the mouth.
Why try it
If you're low in iron, correcting a confirmed deficiency may reduce flare frequency; this is a root-cause check, not a direct treatment.
Dose or use
Ask your healthcare provider for a ferritin level and a full iron panel.
Time to results
Typically 8-16 weeks after correcting a confirmed deficiency
Key study
Correcting a documented shortfall can support recovery; this is a root-cause check, not a treatment claim - ask your provider to test your levels.
Caution
Don't start iron without a blood test; excess iron is harmful and supplements can cause stomach upset.
Vitamin B12 (Cobalamin) Deficiency
Centuries of traditional use· Human evidence not yet assessed (Evidence grade not assigned · Traditional use long-standing)Long-standing traditional staple
Low B12 is a classic canker-sore trigger
Why it may be relevant
If you suspect a nutrient gap, checking your B12 is a high-value step: low B12 is one of the most consistently reported nutritional links to recurrent mouth ulcers.
Why try it
If you're low in B12, correcting a confirmed deficiency may reduce how often sores appear; this is a root-cause check rather than a stand-alone treatment.
Dose or use
Ask your healthcare provider for a serum B12 test (and MMA/homocysteine if borderline).
Time to results
Typically 8-16 weeks after correcting a confirmed deficiency
Key study
Correcting a documented shortfall can support recovery; this is a root-cause check, not a treatment claim - ask your provider to test your levels.
Caution
This is a root-cause check, not a treatment; don't self-dose high B12 without testing, and confirm the level with your provider.
Vitamin B9 (Folic Acid) Deficiency
Centuries of traditional use· Human evidence not yet assessed (Evidence grade not assigned · Traditional use long-standing)Long-standing traditional staple
Low folate rounds out the trigger triad
Why it may be relevant
If you suspect a nutrient gap, folate is the third of the classic trio (with iron and B12) to check, and it is commonly screened together with them for recurrent mouth ulcers.
Why try it
If you're low in folate, correcting a confirmed deficiency may help reduce recurrences; this is a root-cause check, not a stand-alone treatment.
Dose or use
Ask your healthcare provider for a serum or red-cell folate test.
Time to results
Typically 8-16 weeks after correcting a confirmed deficiency
Key study
Correcting a documented shortfall can support recovery; this is a root-cause check, not a treatment claim - ask your provider to test your levels.
Caution
Folate supplements can mask a B12 deficiency; test both before correcting either.
Vitamin D Deficiency
Centuries of traditional use· Human evidence not yet assessed (Evidence grade not assigned · Traditional use long-standing)Long-standing traditional staple
Low D is a common hidden trigger
Why it may be relevant
If you suspect a nutritional gap, checking your vitamin D level is a practical first step — if you're low, correcting it may help reduce how often sores appear.
Why try it
If you're low in vitamin D, correcting the deficiency can support the immune balance that helps keep canker sores at bay.
Dose or use
Ask your healthcare provider for a 25-OH vitamin D blood test.
Time to results
Typically 8–16 weeks after correcting deficiency
Key study
Correcting a documented shortfall can support recovery; this is a root-cause check, not a treatment claim — ask your provider to test your levels.
Caution
Supplementation doses should be guided by test results and a practitioner.
Zinc Deficiency
Centuries of traditional use· Human evidence not yet assessed (Evidence grade not assigned · Traditional use long-standing)Long-standing traditional staple
Zinc gap is a well-recognized canker-sore trigger
Why it may be relevant
For those suspecting a nutritional cause, checking zinc status is key — if you're low, correcting it may directly reduce flare frequency.
Why try it
If you're low in zinc, correcting the deficiency can support wound healing and immune function in the oral mucosa.
Dose or use
Ask your healthcare provider about a serum zinc test.
Time to results
Typically 6–12 weeks after correcting deficiency
Key study
Correcting a documented shortfall can support recovery; this is a root-cause check, not a treatment claim — ask your provider to test your levels.
Caution
Avoid self-prescribing high-dose zinc without testing; excess zinc is harmful.

I'm open to acupuncture or acupressure alongside the basics

Acupuncture
Centuries of traditional use· Human evidence not yet assessed (Evidence grade not assigned · Traditional use long-standing)Long-standing traditional staple
Traditional support for recurring oral flare-ups
Why it may be relevant
For those experiencing frequent recurrence, acupuncture is traditionally used to address underlying imbalances thought to contribute to recurring oral ulcers.
Why try it
Traditionally used in Chinese medicine to support immune balance and reduce the frequency of recurring mucosal conditions like canker sores.
Dose or use
Seek a licensed acupuncturist; sessions typically weekly, course length individualized.
Time to results
Typically 4–8 weeks of regular sessions
Key study
Traditionally used for this condition; this specific use has not been confirmed in controlled clinical trials.
Caution
Ensure practitioner uses sterile single-use needles; inform them of any bleeding disorders or medications.
LI4 (Hegu) - Large Intestine 4
Centuries of traditional use· Human evidence not yet assessed (Evidence grade not assigned · Traditional use long-standing)Long-standing traditional staple
Traditional acupressure point for face and mouth
Why it may be relevant
If sores keep coming back, LI4 is the classic point traditionally used for face and mouth complaints and may be a gentle self-care adjunct between flares.
Why try it
Traditionally used in Chinese medicine for face, mouth, and dental discomfort; offered as a low-risk complementary practice, not a proven treatment.
Dose or use
Press the fleshy web between thumb and index finger for 1-2 minutes, a few times a day.
Time to results
Varies; used as an ongoing traditional adjunct
Key study
Traditionally used in Chinese medicine for face and mouth complaints; this specific use has not been confirmed in controlled clinical trials.
Caution
Avoid firm LI4 pressure during pregnancy, as it is traditionally contraindicated.

Evidence grades describe the strength of published research for Canker Sores, not a promise of results. Nothing here is medical advice — talk to your clinician before starting anything, especially alongside prescription medication.

How to read the grades below

What's going on with your canker sores right now?

I've got an active sore and want it to heal as fast as possible

One is stinging right now — I mainly want the pain calmed and the spot protected

They keep coming back — I want fewer flare-ups over time

LI4 (Hegu) - Large Intestine 4

I suspect a hidden nutrient gap is what's triggering mine

Iron Deficiency

Vitamin B12 (Cobalamin) Deficiency

Vitamin B9 (Folic Acid) Deficiency

Vitamin D Deficiency

Zinc Deficiency