Gluten Free Immune Support Non-gmo Le Certified Dietary Supplement What Is Vitamin C? Vitamin C and Bio-Quercetin is a high-potency vitamin C supplement with an ultra-absorbable form of quercetin. Vitamin C supports immune health, collagen production, a healthy cardiovascular system and more. Quercetin is a flavonoid that complements vitamin C's health benefits. Quercetin complements vitamin C, inhibiting oxidative stress and inflammation to support cardiovascular health. Vitamin C and Bio-Quercetin Benefits Protects against oxidation with 1,000 mg of vitamin C Encourages healthy immune system function with ultra-absorbable Bio-Quercetin Promotes collagen formation and healthy iron uptake Supports cardiovascular health