Nutra-Life Ester-C® is made using a proprietary process that results in a Vitamin C form that your white blood cells absorb quickly. Ester-C® is a researched form of Vitamin C that bolsters your natural immunity around the clock, helping you to fight off winter ills and chills. For additional immune support, this formula also provides antioxidant Citrus bioflavonoids to help shield your cells against free radical damage. Vitamin C is high potency anti-oxidant that supports immunity, but also has a plethora of other health benefits. Vitamin C can support skin health, energy, gum health and overall health and well-being.