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Consumers of oily fish should be aware of the potential presence of heavy metals which may accumulate up what are fatty acids the food chain. Some supplement manufacturers remove heavy metals and other contaminants from the oil through various means, what are fatty acids such as molecular what are fatty acids distillation (see above), which increases purity, potency and safety. Even some forms of fish oil may not be optimally digestible. Of four studies that compare bioavailability of the triglyceride form of fish oil vs. the ester form, two have concluded that the natural triglyceride form is better, and the other two studies did not find a significant difference. No studies as yet have shown the ester form to be superior although it is cheaper to manufacture. [5][6] Although fish is a dietary source of omega-3 fatty acids, fish do not synthesize them, they obtain them from the algae in their diet. For this reason, there is often a significant difference in EPA and DHA concentrations in farmed vs wild caught fish.
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