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A "vitamin" is also a pill that contains vitamins, eaten regularly to keep one healthy.
Fruits and vegetables are a source of vitamins

A vitamin is a chemical compound that is needed for the human body to work correctly. They include Vitamin A, many B vitamins (like B1, B2, B3, B6, and B12), Vitamin C, Vitamin D, Vitamin E, and Vitamin K. For example, citrus fruits such as oranges and lemons contain vitamin C.

Many vitamins can not be made by the body itself. The body needs to get them from other places, usually through food. A short term lack of a certain vitamin is usually not a problem, as the body is able to store vitamins for a short time. Not having a certain vitamin for a longer period of time can lead to different diseases, depending on the lacking vitamin. Probably the best-known of these diseases is scurvy, which results from not having enough Vitamin C.

Today, many pharmaceutical companies make inexpensive pills that contain various vitamins. These pills are sold as a supplement.

Name changes

Currently there are no vitamins F to J. These existed at some time. Today they are no longer seen as vitamins. Some of them were also false leads, and turned out to be something else. Some were also renamed as B vitamins. Today, the B vitamins are a whole complex, and not just one vitamin.

The German-speaking scientists who isolated and described vitamin K (in addition to naming it as such) did so because the vitamin is intimately involved in the 'Koagulation' (clotting) of blood following wounding. At the time, most (but not all) of the letters from F through I were already designated, so the use of the letter K was considered quite reasonable. The following table lists chemicals that had previously been classified as vitamins, as well as the earlier names of vitamins that later became part of the B-complex.

Previous name[1][2] Chemical name[1][2] Reason for name change[1]
Vitamin B4 Adenine No longer classified as a vitamin
Vitamin B8 Adenylic acid No longer classified as a vitamin
Vitamin F Essential fatty acids Needed in large quantities (does
not fit the definition of a vitamin).
Vitamin G Riboflavin Reclassified as Vitamin B2
Vitamin H Biotin Reclassified as Vitamin B7
Vitamin J Catechol, Flavin No longer classified as a vitamin
Vitamin L1[3] Anthranilic acid No longer classified as a vitamin
Vitamin L2[3] Adenylthiomethylpentose No longer classified as a vitamin
Vitamin M Folic acid Reclassified as Vitamin B9
Vitamin O Carnitine No longer classified as a vitamin
Vitamin P Flavonoids No longer classified as a vitamin
Vitamin PP Niacin Reclassified as Vitamin B3
Vitamin U S-Methylmethionine No longer classified as a vitamin


  1. 1.0 1.1 1.2 Every Vitamin Page All Vitamins and Pseudo-Vitamins. Compiled by David Bennett.
  2. 2.0 2.1 Vitamins and minerals - names and facts
  3. 3.0 3.1 Michael W. Davidson (2004) Anthranilic Acid (Vitamin L) Florida State University. Accessed 20-02-07

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