Seem to remember reading about it as good for being anti inflammatory mainly
And here's one of hundreds of links.
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=2ahUKEwiK-8Tci9_iAhUOGewKHUC7A7MQFjAAegQIBBAB&url=https://www.healthline.com/nutrition/top-10-evidence-based-health-benefits-of-turmeric&usg=AOvVaw1d9OAGimVauMi1njZsx-Yt
We actually use olive rather than cod liver oil- basically because we live in olive producing region and you see the old boys and girls here having a real degree of mobility despite having had really hard lives. Another anecdotal issue is that I've seen chronic arthritis sufferers seemingly benefit from a mediterranean diet rich in olive oil whilst living over here. Like I say it seems to work for Old Harry.
Olive oil has to be one of the best and most versatile things going.