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Vine Tea Extract/Dihydromyricetin DHM Powder Dihydromyricetin bulk (DHM) is a remarkable compound first isolated in 1960 from the leaves of the Yeyu grape (Ampelopsis meliaefolia) by researchers Kotake and Kubota. Originally named ampelopsin, it was later reclassified as dihydromyricetin by Zhou Tianda and colleagues in 1996 when they extracted it from Vine Tea.