Docosahexaenoic acid (DHA) is an omega-3 fatty acid. In chemical structure, DHA is a carboxylic acid with a 22-carbon chain and six cis double bonds the first double bond is located at the third carbon from the omega end.Its trivial name is cervonic acid, its systematic name is all-cis-docosa-4,7,10,13,16,19-hexa-enoic acid,and its shorthand name is 22:6(n-3) in the nomenclature of fatty acids.Fish oils are rich in DHA. Most of the DHA in fish and more complex organisms originates in photosynthetic and heterotrophic microalgae, and becomes increasingly concentrated in organisms as it moves up the food chain. DHA is also commercially manufactured from microalgae Crypthecodinium cohnii and another of the genus Schizochytrium.DHA manufactured using microalgae is vegetarian.Most animals make very little DHA through metabolism however small amounts are manufactured internally through the consumption of ?-linolenic acid, an omega-3 fatty acid found in plants, animals, and milk.

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