Kohki tea
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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.
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Astilbin can be isolated from Kohki tea processed from Engelhardtia chrysolepis (huang-qi).[1]