Ultra Tested Tested for Than 950 Contaminants! Heavy Metals- Bacteria- Yeast- Mold- Pesticides & More Casein & Gluten Free Hypoallergenic Dietary Supplement Kirkman's Vitamin C 250 mg. hypoallergenic capsules have a plant cellulose shell with vegetable grade magnesium stearate as a lubricant. No fillers, flavors or other potential allergens are present. The vitamin C in this product is derived from ascorbic acid and sodium ascorbate. By using this combination, the extreme acidity of pure ascorbic acid is neutralized by the sodium ascorbate; this produces a buffering effect that is easier on the digestive tract than straight ascorbic acid. The list of health conditions for which vitamin C has shown promise is very long. Its value in the good health of children is extremely important for the following reasons: Vitamin C supports the immune system by assisting white blood cell function, including antibody levels and responses. Vitamin C is a powerful antioxidant and that can eliminate free radicals that can damage tissues, organs and cells. Vitamin C is essential in the production of collagen. Collagen is the main protein substance in the human body. It holds the body together in the form of tissue, tendons, cartilage, etc. Vitamin C's role in immune system support is one of the key elements that make it very critical for supplementation in children. It is imperative that growing, active children not be deficient in this nutrient.