QUERCETIN PLUS is a proprietary blend of ingredients that work synergistically to enhance the effect of quercetin. Quercetin is a type of flavonol bioflavonoid. Your Wellbeing Quercetin Plus is used to alleviate allergies and assist in the prevention of upper respiratory, skin, urinary and other infections. It is also used for its antioxidant properties. This blend with nettle leaf and olive leaf extract completes the synergy for immune system support.