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The concentrations of EPA and DHA in commercial oils, after modest enrichment, reach about 300 mg\/g; alternative technologies can produce reasonably priced fish oils containing 400 or even 500 mg\/g of \u03c93 acids. When the acids are liberated from the glycerides, concentrates of ethyl esters or free acids with 65 to 70% total \u03c93 fatty acids (at least 50% EPA+DHA) are readily prepared. Difficulties have arisen because most clinical trials have used fish oils of unspecified composition, and some trials are now based on either ethyl esters or free acids. There are at least three different, but not mutually exclusive, absorption routes in humans, namely the preduodenal route, the lymphatic route<jats:italic>via<\/jats:italic> chylomicrons, and the route<jats:italic>via<\/jats:italic> the portal vein to the liver. This makes it difficult to compare results. The difficulty in obtaining dose\u2010related clinical data may in part be due to the form in which the \u03c93 acids are offered and due in part to the natural presence of these fatty acids in the body. The nontriglyceride forms, especially the free acids, have been advocated for standardization of trials to facilitate interlaboratory comparisons.<\/jats:p>","DOI":"10.1007\/bf02535864","type":"journal-article","created":{"date-parts":[[2006,11,29]],"date-time":"2006-11-29T11:00:06Z","timestamp":1164798006000},"page":"858-862","source":"Crossref","is-referenced-by-count":25,"title":["The absorption of fish oils and concentrates"],"prefix":"10.1002","volume":"27","author":[{"given":"R. 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