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Omega 3 fatty acid

Vegetarian sources of omega 3 fats: flaxseeds and flaxseed oil, walnuts, hemp seeds, leafy green vegetables. Unfortunately, however, most naturally occurring vegetarian sources of omega 3 fatty acids are not very rich in DHA (a very important type of omega 3 fat). How much DHA is recommended per day? 100-300mg/day [Ref]