What is GLA (Blackcurrant Seed Oil)?

Blackcurrant seed oil is pressed from the seeds of Ribes nigrum, the blackcurrant berry native to northern Europe and Asia. It stands out from other GLA sources like evening primrose or borage oil because it also contains stearidonic acid (SDA), which helps the body convert GLA more efficiently into anti-inflammatory compounds. The result is a fatty acid profile that works on multiple levels to quiet inflammation throughout the body.

How does GLA (Blackcurrant Seed Oil) work?

GLA is converted in the body into a prostaglandin called PGE1, which acts like a natural brake on inflammation — helping to calm overactive immune responses in the skin, joints, and lining of blood vessels. Unlike most omega-6 fats, which can promote inflammation when eaten in excess, GLA takes a different metabolic path that actively supports an anti-inflammatory environment. The SDA content in blackcurrant oil also gives it a slight omega-3-like effect, making it one of the more balanced plant oils available.

What forms does GLA (Blackcurrant Seed Oil) come in?

Softgel capsules are the most practical form, typically standardized to deliver 200–500 mg of GLA per serving. Liquid oil can be drizzled on food but is less stable and should be refrigerated. Some formulas blend blackcurrant oil with fish oil or vitamin E to enhance absorption and stability. Look for cold-pressed, hexane-free products and check the GLA milligram content rather than just total oil volume.

Where it comes from:

Blackcurrants have been cultivated in northern Europe for centuries, prized as a food and folk remedy for colds, inflammation, and poor circulation. The medicinal use of the seed oil specifically emerged in the late 20th century as interest in essential fatty acid therapy grew, and researchers began identifying GLA as a key therapeutic compound. Blackcurrant seed oil gained particular attention as a gentler alternative to borage oil, which contains the liver-stressing compound amabiline.

What does GLA (Blackcurrant Seed Oil) help with?

• Eczema and dry, inflamed skin: GLA helps restore the skin's natural barrier by replenishing the fatty acids that keep skin supple and resistant to irritation. People with eczema often have a natural defect in GLA metabolism, so supplementing directly can break the cycle of dryness, itching, and inflammation. Improvements in moisture, redness, and itch are typically noticeable within 8–12 weeks.
• Rheumatoid arthritis and joint pain: GLA shifts the body's inflammatory chemistry away from the compounds that drive joint swelling and morning stiffness. Several clinical trials have shown meaningful reductions in tender joints, grip strength, and pain scores with regular GLA supplementation. It works best as a complement to standard care, not a replacement.
• PMS and period pain: GLA supports the production of prostaglandin E1, a hormone-like compound that helps relax uterine muscle and reduce cramping. It also appears to help stabilize mood shifts and breast tenderness in the week before menstruation. Effects are usually felt after two to three full cycles of supplementation.
• Diabetic nerve pain (neuropathy): People with diabetes often have impaired GLA conversion, which can worsen nerve damage over time. Supplementing GLA has been shown in clinical studies to improve nerve conduction, reduce tingling, and ease burning sensations in the hands and feet. This is one of the better-supported uses of GLA in clinical research.
• High blood pressure: GLA helps blood vessels stay more flexible by reducing the inflammatory signals that cause them to constrict. Some trials have shown modest but meaningful reductions in both systolic and diastolic blood pressure with daily GLA supplementation over several months.
• Immune system support: Blackcurrant seed oil's combination of GLA and SDA helps calibrate immune responses — dampening overreaction without suppressing overall defenses. This makes it particularly relevant for autoimmune-adjacent conditions where the immune system is chronically overactive.
• Dry eyes: GLA supports the lipid layer of the tear film, which is what keeps eyes from drying out too quickly. Small clinical studies have found that GLA supplementation reduces dry eye symptoms including burning, grittiness, and light sensitivity, especially in people whose dry eyes are driven by inflammation.
• Menopausal symptoms: GLA plays a role in hormone-related prostaglandin balance, and some women find it helps ease hot flashes, skin dryness, and mood fluctuations during perimenopause and menopause. Evidence here is more preliminary, but the safety profile is good enough to make it a reasonable option to try.
• Chronic inflammation: GLA is one of the few omega-6 fatty acids that actually lowers inflammatory markers rather than raising them. Regular supplementation has been associated with reductions in markers like CRP and IL-6, making it a useful addition to any anti-inflammatory protocol.

What can GLA (Blackcurrant Seed Oil) help prevent?

• Progression of early diabetic neuropathy: GLA supplementation has been shown in trials to slow nerve damage in people with well-controlled type 2 diabetes
• Relapse of joint symptoms in rheumatoid arthritis: sustained GLA use has been associated with maintained symptom relief and reduced flare frequency

Which foods are rich in GLA (Blackcurrant Seed Oil)?

1. Blackcurrants (whole berries): The seed contains the GLA — eating whole blackcurrants provides small amounts along with anthocyanins and vitamin C that support the same anti-inflammatory pathways.
2. Hemp seeds: One of the few foods with meaningful GLA content (around 1–4%), with a balanced omega-6 to omega-3 ratio that supports rather than undermines the anti-inflammatory effect.
3. Oats: Contain small amounts of GLA and support the same prostaglandin E1 pathway; their beta-glucan also helps modulate immune and inflammatory responses.
4. Spirulina: One of the rare non-seed GLA sources — a tablespoon of dried spirulina provides a small but real amount of GLA alongside anti-inflammatory pigments.
5. Evening primrose and borage oils (as food-grade oils): Both are culinary-grade GLA sources sometimes used in cooking or dressings, though their GLA content only benefits you when used cold and unheated.

Practical Tips:

Therapeutic GLA levels are very difficult to achieve through food alone — even hemp seeds require large quantities to approach supplement doses. Blackcurrant seed oil capsules are the most reliable way to get a clinically meaningful amount of GLA. To support the same anti-inflammatory pathway through diet, emphasize oily fish, walnuts, flaxseed, and colorful vegetables while minimizing refined vegetable oils (corn, sunflower, soybean) that compete with GLA metabolism.

What are the side effects of GLA (Blackcurrant Seed Oil)?

• Mild digestive upset, bloating, or loose stools: especially at higher doses
• Nausea if taken on an empty stomach
• Soft or burp-back aftertaste (less common than with fish oil)
• Rare headache in sensitive individuals
• Theoretical increased bleeding time at very high doses: relevant before surgery

Good to know:

Blackcurrant seed oil has an excellent safety record in human trials. Most people tolerate it with no issues at all. Side effects, when they occur, are mild and tend to resolve on their own or with a dose reduction.

How much GLA (Blackcurrant Seed Oil) should you take?

• Recommended daily: 500–2,000 mg of blackcurrant seed oil per day, delivering approximately 100–400 mg of GLA. For joint or skin conditions, clinical trials have often used 1,000–2,000 mg of GLA specifically — confirm the GLA milligram amount on your product label rather than just the total oil dose.
• Best time of day: No strong preference — morning or evening both work well. Splitting the dose (e.g., half with breakfast and half with dinner) may improve absorption slightly.
• With or without food: Always take with food containing some fat to meaningfully improve GLA absorption. A meal with avocado, olive oil, nuts, or eggs is ideal.
• Time to effect: 4–12 weeks; skin and joint benefits typically require 8–12 weeks of consistent use.
• How long to take it: Can be taken continuously for ongoing conditions like eczema, arthritis, or neuropathy. No established need to cycle on and off. Reassess every 3–6 months to evaluate continued benefit.