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.

The best time to take fish oil is with a main meal that contains some fat, usually breakfast or dinner, for better absorption.