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Choline is an essential nutrient for humans and many other animals. Choline occurs as a cation that forms various salts. To maintain health, it must be obtained from the diet as choline or as choline phospholipids, like phosphatidylcholine. Humans, as well as most other animal species, do make choline de novo; however, production is generally insufficient. Choline is often not classified as a vitamin, but as a nutrient with an amino acid–like metabolism. In most animals, choline phospholipids are necessary components in cell membranes, in the membranes of cell organelles, and in very low-density lipoproteins. Choline is required to produce acetylcholine – a neurotransmitter – and S-adenosylmethionine (SAM), a universal methyl donor. Upon methylation SAM is transformed into homocysteine.   Wikipedia

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