Since 1947 Gluten, Wheat, & Dairy Free Non-GMO Suitable for Vegans Kosher Parve Dietary SupplementSolgar® Vitamin C Crystals provide pure, Vitamin C in a convenient dosage form. Vitamin C is a water-soluble nutrient with revered antioxidant and immune supportive properties, In addition to helping to fight free-radicals, it also helps collagen (connective tissue) formation, which is important for healthy skin and joints.