Sheep Sorrel
Quick Facts
- What it is: A sour wild weed whose leaf is eaten as a green and brewed as a folk tea.
- Main uses: Traditional mild laxative, Traditional cooling drink in fevers, Traditional skin wash, Ingredient in Essiac tea (cancer claim not supported by evidence)
- Active ingredients: Oxalic acid and oxalate salts, Anthraquinones, including emodin, Tannins, Flavonoids, Vitamin C
- Forms: Fresh leaf, Dried leaf tea, Tincture, Capsules, Essiac blends
- Time to effect: Hours for any laxative effect; often nothing at all.
- Side effects: Mild stomach upset is common; large or repeated amounts can harm the kidneys.
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What is Sheep Sorrel?
Sheep sorrel is a small, sour-tasting weed that grows in poor, acid soil. Its arrow-shaped leaves are eaten raw in salads and cooked in soups. Botanists call it Rumex acetosella; many people call it field sorrel.
In American folk and Eclectic practice, the leaf and root were dried and brewed as a tea. It was used for fevers, skin sores and sluggish bowels. Today it is best known as one of four herbs in Essiac, a blend sold to people with cancer.
Here is the honest verdict. No good human trial shows that sheep sorrel treats any illness. Long folk use is not proof that it works, and it is not proof that it is safe.
The plant is also high in oxalate, the compound that forms kidney stones. That makes the amount you take matter more than with most kitchen herbs.
How does Sheep Sorrel work?
No one has shown what sheep sorrel does inside the human body. The claims come from lab work and from the plant's known chemistry.
In test-tube studies, extracts slow some bacteria and mop up free radicals. Whether any of that happens in a person who drinks the tea is unknown.
The plant holds anthraquinones, compounds that can loosen the bowels. In sheep sorrel the amount is small and varies from plant to plant. Any laxative effect is likely mild.
Its sour taste comes from oxalic acid. In people, a heavy oxalate load raises the risk of kidney stones. That is the one human effect here that is well established, and it is a risk, not a benefit.
The idea that the herb shrinks tumours has not held up. Animal and cell tests of Essiac have not shown a clear anti-cancer effect. There is no accepted way it could work.
Old talk of 'cleansing the blood' has no modern meaning. Your liver and kidneys do that job. Sheep sorrel has not been shown to help them do it better.
What forms does Sheep Sorrel come in?
Sheep sorrel is sold both as a food plant and as a supplement. The form changes how much you take far more than most people expect.
Fresh leaves, used raw in salads or cooked in soup and sauce.
Dried leaf, brewed as a tea.
Tincture, a liquid extract made with alcohol.
Capsules or tablets of powdered leaf.
Essiac blends, sold as tea or ready-made liquid. These usually pair sheep sorrel with burdock root, slippery elm bark and Indian rhubarb root.
Cooking does not remove oxalate. Supplements are not checked the way medicines are, so strength differs between brands. Labels often fail to say which part of the plant was used.
Where it comes from:
Sheep sorrel came from Europe and spread across North America as a farm weed. Settlers and Native groups ate the sour leaf and drank it as a cooling tea in fevers. Folk healers also laid crushed leaf on sores and rashes.
Eclectic physicians of the 1800s listed Rumex plants as 'blood purifiers' and mild laxatives. They wrote about scaly skin complaints and swollen glands. Their books record use, not tested results.
In the 1920s a Canadian nurse, Rene Caisse, made a tea she called Essiac. Sheep sorrel was one of its four herbs, and she promoted the tea for cancer. Canadian health bodies looked at it more than once and found no proof of benefit.
The plant stayed in home use as a spring green and tonic. That standing is cultural, not medical.
Who should avoid Sheep Sorrel?
- Never use sheep sorrel or Essiac in place of cancer care your medical team has advised.
- Do not use if you have kidney disease, or if you have ever had a kidney stone.
- Do not use if you have gout (a joint disease caused by crystals in the joints) or rheumatoid arthritis flares, which tradition itself warned against.
- Do not use if you are pregnant or breastfeeding.
- Do not give it to children.
- Never eat large helpings of sorrel leaves; acute oxalate poisoning has killed people.
- Do not use if you have a blocked bowel, or inflammatory bowel disease (long-term swelling of the gut).
- Do not use if you take warfarin or another blood thinner, unless your doctor agrees.
- Do not use if you take lithium, digoxin, or water pills (diuretics), unless your prescriber agrees.
- Avoid it if you have been told you are low in calcium or iron.
- Avoid it if you are allergic to sorrel, dock or rhubarb plants.
When should you see a doctor?
Stop and see a doctor if you get pain in your side or back, blood in your urine, or you pass much less urine than usual.
Get emergency help for severe belly pain, repeated vomiting, numbness or tingling, muscle twitching, trouble breathing or confusion. These can be signs of oxalate poisoning.
Also speak to your doctor if diarrhoea lasts more than two days. Tell your oncologist (cancer doctor) before you start any Essiac product.
Is Sheep Sorrel legal where you live?
In the United States, sheep sorrel is sold as a food and as a dietary supplement. It is not approved as a medicine, and cancer claims are illegal; regulators have acted against sellers of Essiac products that made them.
In the UK, EU, Canada and Australia it is handled as a food or food supplement, not a licensed medicine.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
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