Where Science Works Naturally Pharmaceutical Grade Dietary Supplement pH 2.1‡ Naturally Fresh Nitro Pak Bacteria Free Environment Highly Soluble NutriBiotic Ascorbic Acid is 100% pharmaceutical grade vitamin C, an essential nutrient beneficial to the body's overall health. This highly soluble form of vitamin C provides antioxidant protection to the immune system. It has several purposes including maintaining and developing health bones and tissue, and plays important roles in many biochemical reactions. Since vitamin C is not produced by the body, it must be replenished daily. ‡Measure of acidity/alkalinity (neutral pH is 7.0)