Rehmannia glutinosa

Rehmannia glutinosa, known in Chinese as sheng di huang, has been a staple of traditional medicine for millennia. In the Han Chinese pharmacopeia, the dried root is boiled into a decoction to nourish yin, strengthen the kidneys, and treat anemia and chronic fatigue (Li et al., 2015). Among Korean herbalists, the same root is macerated in alcohol to produce a tincture used for liver disorders and to calm the nervous system (Kim et al., 2018). Vietnamese practitioners prepare a decoction of the root for postpartum recovery, citing its ability to boost blood circulation and reduce inflammation (Nguyen et al., 2019). In each culture, the root is the primary material, and the preparations are typically infusions or decoctions rather than powders or poultices.

A simple, safe decoction can be made at home: take 10 g of dried Rehmannia glutinosa root, add it to 500 ml of boiling water, and simmer for 30 minutes. Strain the liquid, discard the solids, and drink two cups daily, preferably in the morning and evening. This dosage is well within the traditional range and is considered safe for most adults. However, pregnant women should avoid the decoction, and individuals with gastrointestinal sensitivity should start with a smaller volume to monitor tolerance.

The therapeutic effects of the root are largely attributed to its iridoid glycosides, especially catalpol, rehmannioside A, and rehmannioside B, which have been isolated and quantified in multiple phytochemical studies. These compounds exhibit antioxidant, anti‑inflammatory, and hepatoprotective activities that align with the plant’s traditional uses for kidney and liver support. Phenylethanoid glycosides such as rehmannioside C also contribute to the root’s anti‑diabetic properties, a claim supported by recent in‑vitro and animal studies.

Modern research continues to validate the traditional claims of Rehmannia glutinosa. Recent clinical trials have explored its efficacy in managing type 2 diabetes and chronic kidney disease, while pharmaceutical companies are developing standardized extracts for use in nutraceuticals and prescription formulations. The plant remains widely cultivated in China, Korea, and Vietnam, and its root is available in both dried and extract forms in herbal markets worldwide.

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