Premium Vitamin C is rich in vitamin C (from a mixture of ascorbic acid and acerola fruit) and plant bioflavonoids (hesperidin, rutin, quercetin, and mixed citrus bioflavonoids) known for their immunoprotective properties.* In addition to supporting healthy immune function, these nutrients have historically been used for applications such as maintaining healthy veins, capillaries, skin, hair, and nails by supporting normal collagen production and repair.*