While fish oil supplements are generally ok for most people to take, if you have an allergy to fish or shellfish or are on a plant-based diet, it might be worth considering alternatives to the best fish oil supplements.
Fish oil supplements are derived from the tissues of fatty fish such as tuna, mackerel, or herring, and often the soft shell of capsules is made from fish gelatin, none of which are suitable for vegetarians or vegans.
"If you are taking blood clotting medicine, you should check with your medical provider," advised Ehsani. Although that's true of most supplements — you should talk things over with your doctor before adding any medication or supplements into your diet.