Differences between 3 types of omega 3 acids: DHA, EPA and ALA

When you see omega-3, it's important to realize that not all omegas are created equal. This chart explains the difference between DHA, EPA and ALA

Docosahexaenoic Acid (DHA)

DHA is a long chain omega-3 fatty acid important for brain and eye development and function throughout life. It also supports heart health. DHA is the most abundant omega-3 in the brain and retina and is naturally found in breast milk.

Eicosapentaenoic Acid (EPA)

EPA is a long-chain omega-3 fatty acid important for overall health. However, unlike DHA, the body does not store EPA in significant quantities in the brain or retina (DHA is found in every cell throughout the body, EPA is not).

Alpha-linolenic Acid (ALA)

ALA, an essential fatty acid (EFA), is a shorter-chain omega-3 that 

serves as a source of energy and as a building block for long-chain 

omega-3 fatty acids (DHA and EPA).

http://www.beautiful-minds.com/the-benefits-of-algal-dha/is-dha-different-from-omega-3s