Science-Based Nutrition Dietary Supplement Helps Promote A Healthy Immune Response Vegan Non-GMO Gluten Free Soy Free Doctor's Best Pure Vitamin C Powder contains Q-C, which is manufactured in Scotland and prized for its quality and reliability. Vitamin C is indispensable to the body for its role in the synthesis of collagen, carnitine, and certain brain chemical transmitters. Abundant clinical research confirms Vitamin C's fundamental support for the immune system, brain, eyes, heart and circulation, and all organ systems. Vitamin C is also an electron donor, supporting numerous enzymes and enhancing the body's total antioxidant potential. Helps promote healthy immune response. Helps the body's antioxidant defenses. Essential cofactor for important enzyme systems. Essential for joints and other connective tissues.