Kohki tea (黄杞茶) or ''Huang Qi Tea'' is a Chinese/Japanese herbal drink very high in antioxidant activity. Kohki tea has been sold over the counter for centuries and is standardized to contain astilbin and

taxifolin Taxifolin (5,7,3',4'-flavan-on-ol), also known as dihydroquercetin, belongs to the subclass flavanonols in the flavonoids, which in turn is a class of polyphenols. Stereocenters Taxifolin has two stereocenters on the C-ring, as opposed to quer ...

. Astilbin can be isolated from Kohki tea processed from '' Engelhardtia chrysolepis'' (huang-qi).Effect of Astilbin in Tea Processed from Leaves of Engelhardtia Chrysolepis on the Serum and Liver Lipid Concentrations and on the Erythrocyte and Liver Antioxidative Enzyme Activities of Rats
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Japanese tea {{nonalcoholic-drink-stub ja:黄杞茶 zh:黄杞茶