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Advanced Nutrition by ZahlerVitamin C and BioflavonoidsAdvanced Vitamin C FormulaGeneral HealthDietary SupplementKosher PareveManufactured in a GMP Certified Facility Non-GMOGluten FreeDairy FreeSoy FreeVegetarian FriendlyFeel Better Everyday™Advanced Vitamin C Vitamin C is an essential antioxidant that helps support the immune system. Since Vitamin C is water soluble and the body cannot store it a continuous supply is needed.