Science-Based Nutrition Helps Promote a Healthy Immune Response Dietary Supplement Vegan Non-GMO / Gluten Free / Soy Free Doctor's Best Vitamin C contains Quali-C, which is manufactured in Scotland and prized for its quality and reliability. Vitamin C is indespensable 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 brain, eyes, heart and circulation, immune system, and all organ systems. Helps the body's antioxidant defenses. Essential cofactor for important enzyme systems. Helps promote healthy immune response. Essential for joints and other connective tissues.