NOW Foods Vitamin C-500 provides 500 mg of pure pharmaceutical-grade ascorbic acid per tablet — a moderate, well-tolerated dose ideal for daily maintenance, children, or those who prefer lower daily vitamin C intake. Vitamin C is an essential water-soluble antioxidant involved in over 300 metabolic functions including immune cell function, collagen biosynthesis, iron absorption, adrenal hormone production, and wound healing. Because vitamin C is water-soluble and not stored in the body, daily supplementation ensures consistent tissue saturation. The 500 mg dose is less likely to cause digestive discomfort than higher doses, making it a good option for those with sensitive stomachs. NOW Foods uses pure ascorbic acid with minimal additives and manufactures in their GMP-certified facility with potency verification on every production batch.