Taking quercetin with cyclosporine might increase the effects and side effects of cyclosporine. Medications changed by the liver (Cytochrome P450 2C8 (CYP2C8) substrates) interacts with QUERCETIN ...

What are the potential side effects of taking zinc and quercetin together? While zinc and quercetin are generally safe when taken in moderation, they may cause side effects in some people.

Quercetin supplements are the latest example ... or that there are not adverse side effects from taking high amounts in supplemental form," says Willett. "Instead, I suggest eating generous ...