Vitamin C supports your immune system as well as whole-body health. Fast C and Bio-Quercetin Phytosome is a unique vitamin C supplement augmented with Bioperine black pepper extract, an ultra-absorbable form of quercetin, and a unique calcium-magnesium mineral complex. Fast C maximizes the absorption and health benefits of vitamin C supplementation. Benefits at a Glance: High-potency, ultra-absorbable vitamin C formula Powerful support for immune system health Helps inhibit oxidative stress and inflammation Bio-quercetin is up to 50 times more absorbable Black pepper extract encourages absorption and bioavailability Calcium-magnesium blend eases sensitive stomachs