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Regarding consumption, up to 5 grams of proper omega 3 per day, as in not the unabsorbed ethyl ester garbage, seems like an effective upper limit before we apparently can have excessive bleeding according to a study on Inuits which conveniently did not record their actual plasma concentrations and instead a relative %, but regarding how much our bodies will happily use in serum phospholipids concentration, I am unsure but it is at least DHA 60mg/L and EPA 175mg/L according to one study which recorded plasma concentrations. DHA would increase to about 140mg/L over 6 hours before returning to a 60mg/L baseline. This is from 800mg every day for two weeks.
According to another study in Japan, concentrations do not increase at all beyond 0.5g-1g of DHA per day as it appears to rapidly level off, resulting in about 30mg/L, but they were unsure if this was a flaw in their methodology.
I'm unsure whether the absolute intake or % of total lipids is of greater importance.
