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Omega-3 fatty acids are considered essential fatty acids. They are necessary for human health, but the body can't make them. You have to get them through food. Omega-3 fatty acids are found in fish, such as salmon, tuna and halibut, other seafoods including algae and krill, some plants and nut oils. Also known as polyunsaturated fatty acids (PUFAs), omega-3 fatty acids play a crucial role in brain function as well as normal growth and development. They have also become popular because they may reduce the risk of heart disease. 
Omega-3 fatty acids reduce inflammation and may help lower the risk of chronic diseases such as heart disease, cancer and arthritis. Omega-3 fatty acids are highly concentrated in the brain and appear to be important for cognitive (brain memory and performance) and behavioural function ⁽¹⁾. 

Life On Omega3-Life is a perfect blend which has omega 3 fish oil concentrate. The three principal omega-3 fatty acids are alpha-linolenic acid (ALA), Eicosapentaenoic Acid (EPA) and Docosahexaenoic Acid (DHA). The main sources of ALA are vegetable oils and flaxseed oil ALA can be converted, usually in small amounts, into EPA and DHA in the body. EPA and DHA are found in seafood. Omega-3 fatty acids are important for a number of bodily functions, including muscle activity, blood clotting, digestion, fertility, cell division and growth. DHA is important for brain development and function ⁽²⁾.
EPA and DHA contribute to the normal function and maintenance of the heart, claim may be used only for food which is at least a source of EPA and DHA as the beneficial effect is obtained with a daily intake of 250 mg of EPA and DHA ⁽³⁾.
Docosahexaenoic acid (DHA) maternal intake contributes to the normal brain development of the foetus, normal development of the eye of the foetus and breastfed infants the claim can be used only for food which provides a daily intake of at least 200 mg DHA ⁽³⁾.
Omega 3 helps in the treatment of rheumatoid arthritis (RA), an autoimmune disease that causes inflammation in the joints and osteoarthritis ⁽¹⁾.

References
1.Omega-3 fatty acids, http://umm.edu/health/medical/altmed/ supplement/omega3-fatty-acids.
2.Omega-3 Supplements: In Depth,nccih.nih.gov/health/omega3/introduction.html.
3.EPA and DHA, ec.europa.eu/nuhclaims.
4.https://en.wikipedia.org/wiki/Omega-3_fatty_acid.