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Hound Dog Mom
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Quercetin is a flavonoid. You can’t really overdose on flavonoids, excess flavonoids are just excreted in the urine. I would say the only risk with “overdosing” would be with green tea derived flavonoids which could get excessively high in caffeine (but this wouldn’t be what’s present in a supplement intended for dogs). I’m sure she’s already getting what she needs, as far as flavonoids, if they’re present in her C-Complex though so it wouldn’t really be necessary to add more.