Why not flax / flax seed oils?
Flax and flax seed oil do not contain long-chain Omega-3 fatty acids. Flax contains alpha-linolenic acid (ALA) which, our bodies must convert to become long-chain DHA and EPA. Seal oil is a natural source of DHA, EPA and DPA (DPA is derived only from marine sources) and does not have to be converted by our bodies. Flax and flax seed oils are agriculturally based products that are high in Omega-6, a fatty acid already abundant in modern Western diets. Conversely, seal has negligible amounts of Omega-6.