Dietary supplement pills. View of a blisterpack of pills containing vitamins A, C and E, and the essential mineral selenium. Blisterpacks are designed to keep each individual pill in a protective atmosphere until it is ready to be used. Vitamin A is necessary for healthy hair, skin and teeth, and also in organ repair. Vitamin C helps the immune system to function correctly, and is also necessary for healthy skin, gums and blood vessels. Vitamin E helps protect cells from natural wear, and also aids wound healing. Selenium is a mineral needed in tiny amounts which also protects the body's cells and reduces the risk of heart disease and maybe even cancer.