Fish oil sups not regulated by fda. are they still safe? ever encounter adverse affect due to mercury or an impurity causing illness in any patients?

Supplements: The fda is forbidden by the dhsea act to pass upon the quality of supplements. This includes fish and other oils. Look for a reliable brand but that is not a complete guarantee. Until congress changes this law, we are stuck with unregulated products of uncertain concentration, unknown quality and no ability to detect impurities or toxins.