re: How much fish oil is needed to do any good?

Spend that money on salmon and sardines and watch your omega 6 like a hawk, until you've created good purchasing habits. Salad dressings are huge culprit. If you eat out a lot then that's a big challenge. I've grown wholly unimpressed with most restaurants as I've continually increased and improved my cooking.

I am still on the fence overall on fish/krill supplements. I don't really like risking eating more oxidized shite. There's some issue of oxidation before it even makes it to the warehouse, due to processing.

And, while I haven't picked apart the studies, there isn't much showing supplements do much good re cardiovascular disease. summary

I do keep a bottle of supposedly good dha/epa in the fridge, and am taking the remainder of my krill oil that is still in date, just because I bought them (yes dumb). I keep it all in the fridge. I take this stuff only after eating out when I know they use shitty oil.