Ester-C Bio is a synergistic combination of a non-acidic form of vitamin C and several different types of bioflavonoids. These nutrients work together to support capillary strength, connective tissue structure, and immune function, making this formula a good choice for those who wish to obtain the protective benefits of these antioxidants for the skin, joints, heart, and immune system.* Ester-C® Bio can be taken by anyone who wishes to increase their intake of vitamin C and plant-derived bioflavonoid antioxidants to support capillary and connective tissue functions.*