I'm not sure.
One would like to believe it is all in good faith, but fish oil is cheap unpatentable. The more benefits it has the greater the threat to existing profitable patented drugs and future patented drugs(when drugs come off patent not surprised to see newer patented versions marketed as more effective or issues suddenly found with the now unpatented substance.).
I mean just look at lot of stuff in food and cosmetics that is banned in Europe due to proven adverse effects, yet the companies own research gets it a GRAS(generally regarded as safe) status, don't tell me that ain't doctored? They switch ingredients in europe but use the cheaper more harmful ingredients in the USA, only caring about money.
Similar I recall some products that were knowingly sold knowing they were contamined and would transmit some disease(think it was hiv), but the company management didn't care.
We've also seen the fossil fuel companies, internal documents showing climate change could significantly damage the world, but outside paying for studies casting doubt on climate change.
Think similar happened with cigarettes, haven't checked the background but pretty sure part of the campaign to cast doubt on whether cigarettes were harmful included dubious studies.
All in all, maybe fish oil isn't as good as some claim, but I would put a large bucket of salt on most research given that as said A LOT OF FINANCIAL INCENTIVE on casting doubt on natural remedies and unpatented drugs that show benefit as good or better than patented drugs.
Hear they even recently cast some doubt on metformin, not surprising given it is off patent.
Edited by Castiel, 07 June 2021 - 11:14 PM.