Rhubarb


Throughout history, Rhubarb has been used medicinally as an anti-inflammatory, antibacterial, antitumour and antipyretic herb.

One of the most common uses for Rhubarb, however, is to balance the digestive system.

Anthraquinone glycosides, constituents in Rhubarb, are responsible for making the smooth muscles of the digestive system contract, encouraging movement and regular bowel motions. This is particularly useful in cases of constipation. Tannins then add to the astringency of this herb, making it also beneficial in cases of diarrhoea.

Botanical name: Rheum officinale

Common name: Rhubarb root 

Studies have shown that Rhubarb can offer protection to the intestinal mucosa by supporting the cell junctions, reducing the likelihood of conditions such as leaky gut.

Rhubarb is also helpful in reducing intestinal inflammation, providing symptomatic relief in conditions such as ulcerative colitis, and maintaining the balance of helpful bacteria in the microbiome, crucial for digestive and immune health.

Xiang, H., Zuo, J., Gur, F., & Dong, D. (2020). What we already know about rhubarb: a comprehensive
review. Springer Nature, 15(88). https://doi.org/10.1186/s13020-020-00370-6

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Frequently asked questions

What is rhubarb root used for?


Medicinal rhubarb root, usually from Chinese rhubarb (Rheum palmatum), is traditionally used to relieve occasional constipation. It contains natural compounds called anthraquinones, which gently stimulate the bowel and encourage a bowel movement, usually within 6 to 12 hours. Rhubarb root has been used in traditional Chinese medicine for more than 2,000 years, where it’s known as da huang, and it was once so highly valued that it was traded along the Silk Road.

Is medicinal rhubarb the same as garden rhubarb?


They’re close relatives, but not the same. The rhubarb we grow in our gardens and bake into crumbles (Rheum rhabarbarum) is eaten for its tart, colourful stalks. Medicinal rhubarb comes from the root of related species such as Chinese rhubarb, which contains much higher levels of the active compounds used for constipation. So while a rhubarb crumble may be delicious, it won’t have the same effect as a herbal rhubarb root preparation.

Why is rhubarb used for both constipation and diarrhoea?


Rhubarb root has an unusual two-way action that depends on the dose. In larger doses, its anthraquinones act as a stimulant laxative to relieve constipation. In small doses, its astringent tannins have a tightening, toning effect on the gut, which is why it was traditionally used to help settle diarrhoea. This is one reason why it’s important to follow the dosage directions on the product label carefully.

Are rhubarb leaves poisonous?


Yes, rhubarb leaves should never be eaten. They contain high levels of oxalic acid, which can cause symptoms such as nausea, vomiting, abdominal pain and, in larger amounts, kidney problems. Only the stalks of garden rhubarb are safe to eat. If someone has eaten rhubarb leaves, contact the National Poisons Centre on 0800 764 766.

Are there any side effects of rhubarb root?


Rhubarb root is intended for short-term use only, generally no more than one to two weeks, as long-term use of stimulant laxatives can lead to dependence and loss of important minerals like potassium. It may cause cramping and can turn urine a harmless yellow or reddish colour. Avoid rhubarb root during pregnancy and breastfeeding, in children under 12, and if you have bowel obstruction, inflammatory bowel disease, unexplained abdominal pain or kidney stones. Check with your healthcare professional before use if you take diuretics, heart medication such as digoxin, corticosteroids or other prescription medicines. See your doctor if constipation lasts more than a week or comes with pain or blood.