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5 1 Quercetin US$ 45 100 Kilogram (Min.Order) Place of origin : China Supply Ability : 2000kg per Month Quercetin is a phytochemical that is part of the coloring found in the skins of sophora japonicas and red onions.It has been isolated and is sold as a dietary supplement.Quercetin is a powerful... Shaanxi Huifeng Pharmaceutical Ltd. See all results Browse Related Reference Standard Herbal Ingredients Pharmaceutical Intermediates Plant Extract Purify