Supports Immune Function Assists In Preventing Vitamin C Deficiency Supports The Body’s Ability To Metabolize Nutrients Contains Antioxidants That Help Protect Against Free Radicals Helps In Collagen Formation To Maintain Healthy Bones, Cartilage, Teeth, And Gums Natural Factors C Extra + Quercetin Bioflavonoids is an immune-support formula that combines the antioxidant benefits of vitamin C and the bioflavonoid quercetin in a potent 1:1 ratio. Vitamin C helps in collagen formation to maintain healthy bones, cartilage, teeth, and gums, while quercetin enhances the activity of vitamin C in the body. Quercetin is currently being studied for additional health benefits. Helps support immune function, prevent vitamin C deficiency, and maintain the body’s ability to metabolize nutrients. Helps in collagen formation to maintain healthy bones, cartilage, teeth, and gums. Source of antioxidants that help protect against free radicals.