Link: https://slatestarcodex.com/2014/06/15/fish-now-by-prescription/

I.

LOVAZA™®© (ask your doctor if LOVAZA™®© is right for you) is an excellent medication. It is extraordinarily safe. It is moderately effective at its legal indication of lowering levels of certain fats in the bloodstream. It has moderately good evidence for having other beneficial effects as well, including treating certain psychiatric, rheumatological and dermatological disorders.

Lovaza is fish oil.

"Come on," you say, "surely there's some difference between Lovaza and the fish oil I buy at my local health food store for a couple of tenners per Giant Jar?"

And you're right. The difference is, Lovaza costs $300 a month.