Science-Based Immune & Collagen Support - Stellar C combines Zinc and Vitamin C with bioflavonoids to help support healthy immune function and normal collagen production and repair.* | Antioxidant Support - All three bioflavonoids in Stellar C – Quercetin, Hesperiden and Rutin – boast protective, antioxidative properties that help with immune support. When paired with Vitamin C, they also help preserve healthy blood capillaries and veins.* | Support Healthy Collagen - Stellar C contains active Vitamin C, which promotes normal collagen production. Collagen can promote healthy skin, hair and nails and is one of the body’s most abundant proteins. In fact, it's the primary protein in bones, skin, tendons, ligaments, and blood vessels.* | Vegan & Non-GMO - Vegan and vegetarian-friendly immune system vitamins made without GMOs, soy, dairy or gluten. | Over 50,000 Doctors Agree - Designs for Health is the physician's choice for top quality professional strength supplements since 1989. Our "Science First" philosophy ensures our products are based on the most recent research and use the highest quality raw ingredients.