2 of these http://www.amazon.com/NOW-Foods-DHA-500-180-Softgels/dp/B003O1U77I/ref=sr_1_1?ie=UTF8&qid=1400026618&sr=8-1&keywords=dha+500
you want 1g dha+500g epa/day ideally for optimal brain health, so take 2 of these /day
I searched through this market awhile back and this was the best out there by far.