Quercetin from a non-citrus plant source, stabilised with additional antioxidants so it does not auto-oxidise on the shelf.

That stabilisation is the quiet engineering here. Quercetin degrades spontaneously if left unprotected, so a product that holds its potency to the end of its shelf life is doing something a cheaper one is not.

Hypoallergenic capsules, from a brand more than 45 years into this work.

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