Now C-500 supports the immune system, skin, bone, and joint health. Vitamin C is needed for amino acid metabolism, neurotransmitter synthesis, and the utilization of many nutrients, such as folic acid and iron. It is also helps maintain healthy tissues by neutralizing free radicals generated during normal metabolism and exposure to environmental stressors. Recommended Use: Take 1 capsule 1 to 3 times daily, or as directed by a healthcare professional. Store in a cool, dry place after opening.Now C-500 Facts: 1 capsule contains: Vitamin C (from Calcium Ascorbate) 500 mg Calcium (from Calcium Ascorbate) 55 mg Citrus Bioflavonoid Complex 10 mg Other Ingredients: Gelatin (capsule), Cellulose and Magnesium Stearate (vegetable source).