16.7mg per serving · Plant Flavonoid Antioxidant
Quercetin is a flavonoid found in many fruits, vegetables and the Sophora japonica bud used here. It's studied as an antioxidant and for supporting a normal inflammatory response. JointReliveX includes 16.7mg per serving — some research on quercetin alone has used considerably higher doses, so think of this as a supporting-cast ingredient rather than the formula's main driver.
See the full JointReliveX ingredients breakdown for how Quercetin fits with the other seven ingredients in the formula.