Re: Fish Oil Recomendation
Aside from EPA+DHA (which is the omega-3 count), the other important factor is purity. There's websites that rate purity of various brands but I can't think of any of them offhand...however, Robb has said somewhere on his website that Kirkland is pretty good. I've never heard of fish oil prescribed for headaches, but I can't think of any reason one particular brand would be better than another for those purposes.
I was just at Costco yesterday and didn't see anything in liquid form. Shop around on Amazon and you can find some at a decent price, though everything I've seen so far is still more expensive per-dose than Kirkland.