Flaxseed is one of the best plant-based source of omega-3 essential fatty acids. It comes from ripened flaxseeds that manufacturers have cold pressed to extract the oil. Another name for flaxseed oil is linseed oil. It does not contain the same nutrients as the whole seed. For example, flaxseeds contain fibre, magnesium, and vitamin B, but flaxseed oil does not. High in Omega-3 Fatty Acids May Help Reduce Cancer Cell Growth Could Benefit Heart Health May Help Treat Constipation and Diarrhoea May Improve Skin Health May Reduce Inflammation