Fatty Acids from vegetable sources. Essential fatty acids (EFAs) are those lipids that our body cannot synthesize, and must be supplied through food. If food does not provide the body with enough EFAs, then supplementation is needed. Within this area, there is a group of fatty acids that come from plant sources, without other unwanted substances such as cholesterol. Highly relevant are Omega-3 and Omega-6 from the polyunsaturated fatty acid group. These come from flaxseed, walnuts, canola etc. In this category, you will find a wide range of fatty acids from plant sources; the best brands at unbeatable prices.