Omega-3 is a type of polyunsaturated fatty acid. There are different types of omega-3 fatty acids. These are alpha-linolenic acid (ALA), eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). ALA is found mostly in walnuts, some seeds, and some oils. EPA and DHA are found in oily fish and eggs. ALA is converted into EPA and DHA by the body.
Omega-3 and depression have been linked in the following ways.
A meta-analysis of data from 11 trials found that Omega-3 helped reduce depression symptoms. Omega-3 appeared to be more beneficial to people who were taking antidepressants.
Some supplements can be harmful or ineffective if you take the wrong dose. Talk to your health care professional if you are thinking of taking supplements.
Omega-3 supplements are available at supermarkets, health food shops and pharmacies. Vegetarian varieties are also available.
Fish oil supplements may also contain omega-3 fatty acids but the amount will vary. It is important to check the label for omega-3. Common complaints from fish oil supplements include bloating, gas, belching, nausea, bad breath and/or loose stools.
There is evidence to suggest omega-3 helps depression. It appears to have stronger effects in people who are also taking antidepressants.
Last reviewed and updated: 26 March 2015