My Norwegian boyfriend drinks cod liver oil straight (pills are for wimps, he says). He made me drink it once, and it nearly came right back up! Anyway, I use the tablets, but do so not for joint benefit, but for getting the important omega fatty acids, as I rarely eat meat/fish (perhaps once a month, if that).
I'm not sure about the actual joint benefits, but the entire country of Norway can't be wrong, can they?? Give it a try and see how you get on - even if it doesn't help with the joints, it's good nutritionally.