A bit fishy: Six arsenolipids have been isolated from cod-liver oil and identified by HPLC and mass spectrometry as a series of arsenic-containing long-chain fatty acids (for example, see picture). These fatty acids account for about 20 % of the total arsenolipid content of cod-liver oil.
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Rumpler et al. (2008) studied this question.
Synapse has enriched 3 closely related papers on similar clinical questions. Consider them for comparative context: