Flaxseed oil is not necessarily an alternative.<p>Fish oil contains EPA and DHA type omega-3 acids and flaxseed (and walnuts and hemp seed) contain ALA, which the body converts to EPA and DHA, but inefficiently.<p>Source: <a href="http://www.supplementquality.com/efficacy/fishoil_flaxoil.html" rel="nofollow">http://www.supplementquality.com/efficacy/fishoil_flaxoil.ht...</a>