21st Century B Complex With Vitamin C Caplets Is a combination of Vitamin C and B vitamins essential to the body and includes five B vitamins B1 (Thiamine), B2 (Riboflavin), B3 (Niacin), B5 (Pantothenic acid), and B6 (Pyridoxine) which are interdependent and interrelated in function and are needed for the metabolism of carbohydrates, fats, and proteins to convert food into energy while helping maintain the nervous system and body tissues, as Vitamin C is an antioxidant nutrient that helps build and boost immunity by eliminating toxins, can prevent or slow cell damage caused by free radicals, contributes to immune defense by supporting multiple cellular functions of the body’s adaptive immune system, encourages the production of white blood cells such as lymphocytes and phagocytes to help protect against infection, helps these white blood cells function more effectively while protecting them from damage caused by free radicals, and contains a unique blend of ingredients that helps increase the availability of these nutrients so the body gets the most out of every dose.