What Is Quercetin 95/98% HPLC Natural Flavonoid Antioxidant? Applications, Dosage, Alternatives & Specifications

Quercetin, chemically known as 3,3',4',5,7-pentahydroxyflavone, has the molecular formula C15H10O7 and CAS number 117–39–5. Quercetin is a naturally occurring flavonoid compound widely found in nature, belonging to the vitamin P group. It is extensively present in the stems, bark, flowers, leaves, buds, seeds, and fruits of many plants. Common quercetin-rich plant sources include Sophora japonica buds (Huaimi), ginkgo biloba leaves, onions, apples, green tea, and buckwheat. Quercetin appears as a yellow crystalline powder, odorless with a slightly bitter taste. Quercetin itself contains two molecules of bound water (dihydrate), and the content determination requires calculation based on anhydrous quercetin. As one of the most widely distributed and most extensively studied flavonoid compounds in nature, quercetin is renowned for its potent antioxidant, anti-inflammatory, and immunomodulatory activities, with broad applications in dietary supplements, functional foods, pharmaceuticals, and cosmetics. Quercetin has a clear regulatory status and testing standards in China. GB 5009.248–2016 "National Food Safety Standard – Determination of Quercetin in Foods" specifies the method for determining quercetin content in foods. The "National Food Safety Standard – Food Additive – Quercetin" specifies the quality requirements, testing methods, and label identification for quercetin (including quercitrin). It should be noted that according to domestic regulatory requirements, quercetin is not yet included in the food catalog and cannot yet be used or sold as a food ingredient in China.

Quercetin extract can be divided into the following main varieties by purity grade, raw material source, and application field: Series

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