According to Wikipedia there are 11 forms of Omega- 3 -Fatty acids.
Three of those have received the most attention as being beneficial to our health. These include Alpha- Linolenic Acid (ALA), EPA and DHA.
I did not see ALA ( alpha - linolenic acid) listed as a primary ingredient on the packages I looked at , so it must fall into the "other" category.
ALA cannot be over looked because it is the parent fatty acid to EPA and DHA.
Alpha -linolenic acid is found in vegetables such as rape seed used to produce canola oil, flax seed, walnuts, TOFU , spinach, Romaine lettuce ,soybeans, turnip greens, brussels sprouts, raspberries green beans and others. I generally think of the sources of ALA as Beans, Greens and Nuts.
Our bodies can convert Alpha- Linolenic Acid to EPA and DHA,however;
This conversion process is not efficient so we tend to delegate this job to fatty cold water fish , such as Sardines , salmon , Cod , Tuna ,Herring ,shrimp and scollops .
In summary eating greens,beans,nuts (especially walnuts) and cold water fish is not a bad idea. It reminds me of something called the Mediterranean diet.
Have fun eat healthy and defeat diabetes