Does all DHA come from fish?

No, DHA can also come from other sources such as seeds, eggs and some plants, but in much weaker concentrations than in fish. Also in non-fish forms, it’s generally produced by an inefficient conversion process from another omega-3 fatty acid called alpha-linolenic acid (ALA). As an example flaxseed oil (FLO) comes from the flax plant and contains both omega-3 and omega-6 fatty acids. FLO contains the plant-derived omega-3 fatty acid alpha-linolenic acid (ALA), which can be converted to EPA & DHA but very inefficiently (8-20% of ALA to EPA; .5-9% to DHA); therefore, it is not considered a good source of the two potentially beneficial compounds. If you are looking for the specific benefits, such as maintaining heart, brain, hearing and vision health, associated with omega-3s, look for fish oil capsules containing ~600mgs of omega -3s made up of 360mgs EPA & 240mgs DHA. Take 1 capsule daily if not consuming 2-4 svgs/wk of fatty fish, unless a qualified physician advises more for a specific condition.

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