Vitamins are a group of organic nutrients, which are essential to regulate the chemical processes that go on in the body. Generally speaking vitamins cannot be made in the body and must be obtained from foods, or supplements.

There are 13 known vitamins, which can be categorised as either fat-soluble (A, D, E and K) or water soluble (the eight B vitamins and C with except vitamin B12), remain in the body for short time and therefore need to be replenished more frequently. With a few exceptions notably vitamins D and K, the body does not have the capacity to manufacture vitamins- so, to maintain good health, they must be ingested through food or in nutritional supplements.