Vitamins are substance found naturally in the environment.  The human body uses them to stay healthy and support its functions. There are two types of vitamins: Water-soluble and Fat-soluble.

Minerals are also found naturally on earth and in the water. Plants and animals use them to get nutrients.

Food is the best source to obtain vitamins and minerals.  Most people do not need to take additional vitamins.  However, your doctor may recommend taking extra vitamins if you have certain health problems. For example, people on a strict vegetarian diet may need Vitamin B12 supplement; whereas women may need additional calcium and vitamin D supplements to prevent Osteoporosis.

Vitamins and minerals can be dangerous if consumed in excess.  Therefore, you should never take extra vitamins without talking to your doctor first.

(Source: www.FamilyDoctor.org)