Fresh Flaxseed Oil. Flaxseed oil is an ideal vegetarian (non-fish) source of omega-3 essential fatty acids (EFAs). Omega-3 EFAs are used to make prostaglandins which regulate many vital body processes. Great care is taken at every step of the manufacturing process to ensure the quality of Source Naturals Omega-Flax™. It is cold pressed and unrefined using a process that eliminates both light and air during manufacturing for maximum freshness.