Vitamins are essentials – the substances your body needs to function normally. You can usually get the vitamins you need from a healthy, balanced diet. 1 Add a "rainbow of color" to your diet and you increase your chances of getting what you need.
But some people lack certain vitamins, so they need supplements.1 Ask your doctor whether or not you do. And, remember: too much of a good thing can be bad for you. So be careful not to overdo.