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this text MIGHT need to go back into the article
Oxygen is 'vital to the working of the human body', but it isn't a 'vitamin'. --[[User:Fullmetajacket|Fullmetajacket]] 22:36, 10 March 2007 (EST)
Oxygen is 'vital to the working of the human body', but it isn't a 'vitamin'. --[[User:Fullmetajacket|Fullmetajacket]] 22:36, 10 March 2007 (EST)
==Removed text==
required, in very small amounts, to maintain an organism's health. They act
cannot be produced by the organism, and so
Some substances are vitamins in certain organisms, but not in others (for example, ascorbic acid can be produced by all [[mammal]]s except [[guinea pig]]s and [[human]]s, and so is a vitamin only in those two instances.