Botanical Overview
Gennoshiouko (Geranium thunbergii) belongs to the Geraniaceae family. While not among the most extensively documented medicinal plants, this species has recorded uses that warrant attention from researchers and practitioners. This species belongs to the Geraniaceae family, a group of flowering plants.
General Description
It is one of the most popular folk medicines and also an official antidiarrheic drug in Japan. It is called ゲンノショウコ. Geraniin is an ellagitannin found in G. thunbergii.
Family Context
The Geraniaceae family is widely distributed. Notable medicinal members include:
- Cranesbill — 17 documented uses
Geographic Distribution
Gennoshiouko has been recorded in 10 countries and territories worldwide, including Austria, Belgium, Belarus, China, Germany, and others.
Traditional Uses
Gennoshiouko has been traditionally used for digestive health.
Digestive health.
- Diarrhea
For digestive complaints, the herb is typically prepared as a tea or decoction taken before meals. The bitter compounds stimulate digestive secretions and improve nutrient absorption. Some traditions use the powdered root or leaves in small doses as a stomachic tonic.
Active Compounds
Phytochemical research has identified 30 compounds in this species, including a diverse array of phytochemical classes (see the Complete Chemical Inventory below for the full list).
The identified compounds include the following categories:
- Flavonoid: antioxidant compounds that protect cells from oxidative damage
- Phenolic: antioxidant compounds that neutralize free radicals
- Tannin: astringent compounds that tighten tissues and resist infection