Multi-vitamins (or multivitamins) are perhaps the most popular dietary supplements on the market. They contain blends of vitamins and dietary minerals and other micronutrients. Vitamins are organic compounds naturally found in foods and are more complex than minerals. Our bodies require all of the vitamins in order to function properly. Vitamins control the chemical reactions in the body that convert food into energy and bodily tissue. Minerals allow the body to perform several functions – including making hormones, transmitting nerve impulses and building strong bones. Multi-vitamins are marketed as a way to ensure users get all the nutrients they need to improve and maintain their health.