Quercefit® by Indena® is a quercetin Phytosome® derived from Sophora japonica L., enhancing quercetin's bioavailability up to 20 times. It supports immune health, reduces allergy symptoms, and exhibits senolytic properties beneficial for skin aging. Clinical studies confirm its efficacy in managing early-stage COVID-19 and improving recovery. Quercefit® is suitable for capsules, tablets, and functional foods aiming to deliver potent antioxidant and anti-inflammatory benefits.