Fish oil can reduce bad fats called triglycerides, but it usually doesn’t lower bad cholesterol (LDL) and may even raise it a little in some people.

Some of the signs that may indicate the need for an intake of omega-3 include dry skin or hair, tiredness, joint pain, poor memory or concentration, mood swings, and eye dryness.

Major side effects of omega-3 can include a fishy aftertaste, stomach upset, loose motions, nausea, and at high doses increased bleeding risk or irregular heartbeat.

People who should avoid omega-3 or ask a doctor first are those taking blood thinners, people with bleeding problems, fish allergy, before surgery, pregnant women on high doses, and people with heart rhythm problems.