Quercetin
Quercetin is a plant flavonoid with antioxidant and anti-inflammatory properties. As a dietary intake from foods it is safe.
What it is
A naturally occurring flavonoid (polyphenol) found in many plants including onions, apples, berries, and tea; available as dietary supplement.
Naturally present in plant foods; used as a dietary supplement and antioxidant ingredient in some functional foods.
Why it's flagged
- potential drug interactions at supplement doses
- limited long-term safety data at high supplement doses
What regulators actually say
"Quercetin is a flavonoid widely distributed in plants and consumed as part of a normal diet; available NIH ODS information addresses dietary supplement use."
"Dietary supplements containing new dietary ingredients require notification to FDA at least 75 days before marketing under DSHEA."
Regulatory status
United States — FDA
Quercetin is GRAS as a dietary ingredient; supplement use regulated under DSHEA.
European Union — EFSA
Naturally present in food; specific health claim applications evaluated under Regulation (EC) No 1924/2006.
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