Quercetin is a flavonol, a type of plant polyphenol. It occurs naturally in foods such as onions, apples, berries, and some teas.
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Quercetin is commonly used as a supplemental plant flavonoid and studied for antioxidant and related biological activity. Absorption and metabolism vary by chemical form, so laboratory findings do not guarantee a specific effect from a powder.
Quercetin has low water solubility, so some powder may remain suspended or settle after mixing. Stir or shake it as the product label directs, and do not add extra powder simply because the drink looks cloudy.