C Plus BioFlavonoids is a proprietary blend of vitamin C and three unique bioflavonoids – naturally occurring plant substances found in brightly colored fruits and vegetables. C Plus BioFlavonoids contains three unique bioflavonoids quercetin, hesperidin, and rutin. They work in synergy with vitamin C to keep collagen (the body's intercellular "cement") in good condition.* Quercetin, hesperidin, and rutin, especially when paired with vitamin C, work together to protect and preserve the structure of blood capillaries, supporting blood vessel health. Great-tasting without fructose or any unfavorable sweeteners.* Made in USA. Made with NON-GMO. Gluten, Soy, Dairy FREE.