I'm not sure what the literature says - I have heard that taking 400mg to 4000mg is ideal. Make sure it is Active EPA/DHA (add the two amounts from the nutrition label). And, verify how many capsules equal one serving... it is often 2 - but I have seen bottles where only 1 capsule is the serving.
I don't take the liquid - so I have no advice there.
Personally, I take 2000 mg and I notice a difference in my mood if I miss a dose. I take it at night with a tums to avoid fish burps. I work with a Naturopath Dr and know I take more than the average person.
Hope that provides a little help
