"Taking an overview of the various fatty acids intake recommendations worldwide, and the confounding factors surrounding the common vegetarian diet, leads to a conclusion that an ALA intake of 1.5% of total energy is optimum for vegetarians – or roughly 4g a day. This should provide enough of the parent omega 3 fat to ensure significant amounts of
EPA and DHA are formed by the body (conversion rates are around 5-10% for EPA and 2-5% for DHA). However it is also important for vegetarians to ensure that their intake of LA is not too high compared with ALA since a higher intake of LA interferes with the process in which the human body converts ALA into the even more beneficial EPA and DHA, so a LA to ALA ratio of around 4 to 1 or slightly lower is considered to be the optimum, but any steps to bring down an excessively high amount of omega 6 fats in the diet would be beneficial."
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http://www.vegsoc.org/info/omega3.html