Dietary Supplement for Immune Support. Each serving provides 500 mg of Vitamin C and 250 mg of Quercetin, along with bioflavonoids. Vitamin C is a potent antioxidant that supports healthy bones, cartilage, teeth, and gums. It protects cells from free radical damage and supports healthy cell growth. Quercetin is a well-known antioxidant bioflavonoid that acts as a free radical scavenger, supporting healthy sinus, respiratory, and immune system function. These are easy-to-swallow capsules. Suitable for vegetarians and vegans. Manufactured by Natural Factors to ensure safety and potency in accordance with FDA and Health Canada Good Manufacturing Practices (GMP). Free of artificial colors, preservatives, sweeteners, dairy, starch, sugar, wheat, gluten, yeast, soy, corn, egg, fish, shellfish, animal products, salt, tree nuts, and GMOs.