Antiaggregant and anticoagulants beware of herbs.
It is known that some drugs, in particular some anticoagulants or antiplatelet agents, have clear possibilities of interaction with other drugs or dietary supplements, but also with simple foods.

Quercetin, like most of the naturally occurring flavonoids, is poorly absorbed in the intestine, and this therefore makes it a molecule largely excreted through the faeces. On the other hand, however, quercetin has been shown, especially in animal studies, to have various and important effects including the antioxidant effect.