Best Fish Oil Supplements 2023. Fish and marine oils that are rancid, or “oxidized,” can have an extremely unpleasant odor and taste, and may be less safe and effective. Best liquid fish oil supplement:
Some fish oil supplements contain added vitamins, such as vitamin e, to help stabilize the oils to prevent them from going rancid. The combined epa and dha should be 500mg or more to see the benefits.