I have been taking cod liver oil off and on this year.
This link to Healtheries lists its benefits.
And here is the Weston A Price foundation info.
The only negative is the taste. It is not one of life’s pleasures – so how do I take it?
I put the dessert spoon of cod liver oil in my mouth then chase it down with half a glass of milk/cream. It minimises the after taste and minimises any taste that may try to linger. Avoid licking your lips!
Take a read, get down to the shop and get into it.