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An omega−3 fatty acid is a fatty acid with multiple double bonds, where the first double bond is between the third and fourth carbon atoms from the end of the carbon atom chain. "Short-chain" omega−3 fatty acids have a chain of 18 carbon atoms or less, while "long-chain" omega−3 fatty acids have a chain of 20 or more.
Mammals are unable to synthesize omega−3 fatty acids, but can obtain the shorter-chain omega−3 fatty acid ALA (18 carbons and 3 double bonds) through diet and use it to form the more important long-chain omega−3 fatty acids, EPA (20 carbons and 5 double bonds) and then from EPA, the most crucial, DHA (22 carbons and 6 double bonds). [2]
Krill oil capsules. Krill oil is an extract prepared from a species of Antarctic krill, Euphausia superba.Processed krill oil is commonly sold as a dietary supplement.Two components of krill oil are omega-3 fatty acids similar to those in fish oil, and phospholipid-derived fatty acids (PLFA), mainly phosphatidylcholine (alternatively referred to as marine lecithin). [1]
In physiological literature, it is listed by its lipid number, 18:3 (n−3). It is a carboxylic acid with an 18-carbon chain and three cis double bonds. The first double bond is located at the third carbon from the methyl end of the fatty acid chain, known as the n end. Thus, α-linolenic acid is a polyunsaturated n−3 (omega-3
Modern cod liver oil capsules Kepler's Cod Liver Oil with Malt Extract. Cod liver oil is a dietary supplement derived from liver of cod fish (). [1] As with most fish oils, it contains the omega-3 fatty acids eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), and also vitamin A and vitamin D.
For example, Nordic Naturals reports per serving DHA 390 mg and EPA 195 mg (total omega−3 = 715 mg), Calgee reports DHA 300 mg and EPA 150 mg (total omega−3 = 550 mg) and so on, but iwi Life reports DHA 100 mg and EPA 150 mg (total omega−3 = 252 mg). For information and comparison purposes only, no endorsements are implied.
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