What groups are vitamins divided into?

Answer 1

water-soluble and fat-soluble.

Answer 2

A vitamin is an organic compound required as a nutrient in tiny amounts by an organism. A compound is called a vitamin when it cannot be synthesized in sufficient quantities by an organism, and must be obtained from the diet. Thus, the term is conditional both on the circumstances and the particular organism.

Human vitamins:

* Vitamin A - Retinoids (retinol, retinoids and carotenoids) * Vitamin B1 - Thiamine * Vitamin B2 - Riboflavin * Vitamin B3 - Niacin, niacinamide * Vitamin B5 - Pantothenic acid * Vitamin B6 - Pyridoxine, pyridoxamine, pyridoxal * Vitamin B7 - Biotin * Vitamin B9 - Folic acid, folinic acid * Vitamin B12 - Cyanocobalamin, hydroxycobalamin, methylcobalamin * Vitamin C - Ascorbic acid * Vitamin D - Ergocalciferol, cholecalciferol * Vitamin E - Tocopherols, tocotrienols * Vitamin K - Phylloquinone, menaquinones

Other letters were once used for other essential substances but were later found to not fit into the "vitamin" category for one reason or another, whether is be the fact it could be synthesized easily or it was actually closely related to another type of vitamin, as was seen with many of the B vitamins. Many others were simply not used before.

Named "vitamins" (not officially recognized, but recognised at one point in history):

* Vitamin F - Essential fatty acids * Vitamin G - Riboflavin * Vitamin H - Biotin * Vitamin I - A mix of the B vitamins, possible candidates for this substance are inositol, niacin (nicotinic acid), and biotin * Vitamin J - Choline * Vitamin L - sometimes refered to as anthranilic acid * Vitamin M - Folic acid * Vitamin N - Never scientifically used * Vitamin O - Never scientifically used, although it is interesting to note a controversial product was named after this, claiming to give supplementary oxygen (which is just ridiculous) * Vitamin P - A popular alternative term for bioflavonoids * Vitamin Q - Coenzyme Q10 * Vitamin R - Methylphenidate * Vitamin S - Never scientifically used * Vitamin T - Never scientifically used * Vitamin U - S-Methylmethionine * Vitamin V - colloquially known as Viagra * Vitamin W - Never scientifically used * Vitamin X - Never scientifically used * Vitamin Y - Never scientifically used * Vitamin Z - Never scientifically used

Answer 3

There are a variety of subdivisions of vitamins. These include vitamin A, the B vitamins, vitamin C, vitamin K, as well as vitamin D.

Answer 4

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from Microsoft dept answers.com

Answer 5

vitamins a,b,c,d,e,and k