There are 13 essential vitamins that are “must haves.” They are vitamins A, C, D, E, K and eight types of B vitamins. Each has a specific duty within our body. All are essential to the daily maintenance and repairs our body needs every day. Converting food into energy, keeping cells healthy, and supporting the immune system are just a few of the jobs they assist us with. Think of vitamins as the oil that makes a squeaky wheel turn. Vitamins assist us with all the essential chemical processes that take place inside our bodies. The loss of any particular vitamin can hamper or block the important metabolic reactions that should be happening inside the cells our bodies need to function properly.