Vitamin C is one of the more highly utilized nutrients in the human body.  In addition to being required for collagen production in the body, it is a powerful antioxidant that has traditionally been used to enhance immune response and stave off cellular damage from toxin and pollutant exposure.  Known deficiencies impair the body's natural healing process.  Therefore, vitamin C is useful to boost and strengthen the immune system.  Bio C-1000 includes 1000 mg of vitamin C in an antioxidant base of bioflavonoids, which compliments vitamin C.