Geranium thunbergii

In Japan, Geranium thunbergii—known locally as furofuki or gen-no-shoko—has long been used as a “cold water decoction” to calm the gut and bind, especially in the Kampo tradition described in Nihon Yakuso (Hirata, 1979). Fresh aerial parts are also pressed as a poultice to check bleeding and inflammation on cuts and bruises. In Korea, the aerial parts are used in a water decoction for acute diarrhea and to soothe heat in the stomach, as recorded in Flora of Korea (Lee, 1996). Among the Hakka of Taiwan, the leaves are infused into a mild tea given to newborns and infants to relieve colic, an ethnomedical practice documented by Lin et al. (1996). These three regional uses—binding cold decoctions in Japan and Korea, and infant colic tea among the Hakka—underscore a longstanding reputation for astringency and gastrointestinal comfort.

A simple and widely reported preparation is a mild tea: place 2–3 g of dried aerial parts in 300 ml of freshly boiled water, cover, and let steep for 10–15 minutes. Drink the warm infusion in small sips after meals. For traditional “gen-no-shoko” on the bench, cold infusion is common: 1.5 g of dried aerial parts is steeped for 15–30 minutes in 200 ml of cool water. If you are pregnant, nursing, managing diarrhea from infection, or taking anticoagulants, consult a qualified practitioner before use.

These uses align with what is known of the plant’s chemistry. Geranium thunbergii contains abundant hydrolysable tannins such as ellagic acid and geraniin, which underpin astringent activity and bind intestinal secretions. Flavonoids including quercetin and kaempferol derivatives, gallic acid, and small amounts of essential oil add antioxidant properties, supporting its history in soothing irritated mucous membranes.

Today, dried gen-no-shoko is available in many herbal shops and online, and it continues to be featured in Kampo practice for short courses during acute gastrointestinal upset. Modern research explores its antioxidant and anti-inflammatory potential and the possible contribution of its tannins to gut mucosal protection.

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