Product Card Vitamin C is an essential antioxidant for supporting healthy immune system, teeth, and gum health. Carlson Vitamin C Crystals, Non-GMO are made with pure vitamin C (ascorbic acid). Take a 1/2 teaspoon dissolved in water or juice one to two times daily. sku_3356-UPC Choose Options Immune Health Vitamin C Crystals, Non-GMO MSRP: Was: Now: $16.90 - $55.00