Clicks in joints...

I wouldn't think so, but it's nothing to worry about (unless it actually hurts when it clicks). I have clicky joints all the time. It's caused when you "open" your joint (say bend your knees) then sit still for a while. This causes the fluid in your joints to expand, lowering it's density so bubbles form inside it. When you move, these bubbles "pop", hence the noise and will eventually dissolve back into the fluid. This is why you can't click a joint twice quickly. If it does hurt when it clicks though, then I'd go see a GP. Joint problems tend to be more easily rectifiable if they're caught early rather than letting damage build up.

Would cod liver oil make it better?