Vitamin C Powder - Ultra Clean, Non-GMO, Pharmaceutical Grade, Safe for daily use Vitamin C as Ascorbic Acid. This is still the most popular and famous immune boosting natural supplement ever. Doctors still recommend it! As it is a potent antioxidant, most animals synthesise their own Vitamin C but humans must rely upon dietary sources. Our powder is Super Clean & Effective you must measure your dose as this is Pure Ascorbic Acid, it really works, so use correctly. Made & Tested To British (BP) & American (USP) Pharmacopeias.