Docosahexaenoic acid (DHA) is an omega-3 fatty acid that is a primary structural component of the human brain, cerebral cortex, skin, and retina.
Docosahexaenoic acid(DHA) is a poly unsaturated fatty acid that belongs to the Omega-3 fatty acids. DHA's structure is a carboxylic acid (-oic acid) with a 22-carbon chain (docosa- is Greek for 22) and six (hexa-) cis double bonds (-en-); with the first double bond located at the third carbon from the omega end.
Eicosapentaenoic acid (EPA; also icosapentaenoic acid) is an omega-3 fatty acid. In physiological literature, it is given the name 20:5(n-3). It also has the trivial name timnodonic acid. In chemical structure, EPA is a carboxylic acid with a 20-carbon chain and five cis double bonds; the first double bond is located at the third carbon from the omega end. Eicosapentaenoic acid can also be formed from alpha linolenic acid, but this conversion does not seem optimal. It is the precursor of important physiological substances in the body, the series 3 eicosanoids: prostaglandins, leukotrienes and thromboxanes
The European and American Food Safety Authorities have approved Health claims for EPA with DHA for Heart Health and DHA for Brain and Eye Health.