Vitamins are a group of totally unrelated substances that have only one thing in common – they are essential (usually in tiny amounts) for the normal functioning of the body. Most vitamins have been given letter codes, the series are due to substances initially having been identified as vitamins but later being found to lack the essentials for the classification.
Many animals can produce most the vitamins they need, but the amount and type that each species requires from their diet varies enormously. For example, only humans and guinea pigs are unable to produce their own vitamin C.
Humans can actually produce their own vitamin D by the action of sunlight on the skin.
There is no evidence that vitamin supplements benefit anyone on a normal diet and in good health. The cheapest and most effective way to obtain adequate vitamins is to eat a well-balanced diet. Most vitamin supplements are expensive, pass rapidly through the body, and merely enrich the sewers.
- Vitamin A (Retinol)
- Vitamin B
- Vitamin B1 (Thiamine)
- Vitamin B2 (Riboflavine)
- Vitamin B3 (Nicotinic Acid)
- Vitamin B5 (Pantothenic Acid)
- Vitamin B6 (Pyridoxine)
- Vitamin B7 (Biotin/Vitamin H)
- Vitamin B9 (Folic acid/Vitamin M)
- Vitamin B12 (Hydroxocobalamin)
- Vitamin C (Ascorbic acid)
- Vitamin D
- Vitamin E (tocopherols)
- Vitamin K (phytomenadione/phylloquinone)