METHOD FOR PRODUCING POLYGONUM TINCTORIUM EXTRACT

摘要

The present invention addresses the problem of providing a tryptanthrin-containing Polygonum tinctorium extract particularly suitable for dermal applications. The present invention provides a method for producing a tryptanthrin-containing Polygonum tinctorium extract, the method comprising a step for filtering a mixture comprising an ethanol-extracted concentrate of Polygonum tinctorium and a polyhydric alcohol, and recovering the filtrate. Also provided is the Polygonum tinctorium extract produced by this production method.