Vitamins are very important in the body. They are needed in certain processes in our body to function well and maintain a good health. They aid in improving our immune system, strengthening our bones and other good health indicators. The vitamins that are most imporant to be in the body are vitamins A, C, D, E, K, B1, B2, B3, pantothenic acid, biotin, vitamin B6, vitamin B12, and folic acid.