In reply to shark:
Just had a quick look at the UKB thread on supplements, I think a few of those are mine (sorry):
Don't bother with combined fish oils and Glucosamine/Chondroitin, you are paying for the packaging (and some bored chemist who spent a few weeks trying to get the stuff to pump properly and not sediment when you turn off the mixer). If you want EPA/DHA and Glucosamine/Chondroitin/MSM then take oil capsules and the rest in tablets.
Quality of fish oils varies hugely as does the manufacturing process. A few general rules:
The main difference between liver oils and fish oils is the Vit A&D content, try not to overdose on A&D as it isn't a great idea.
Research is fairly divided on EPA/DHA as to which is most important and I honestly haven't got a clue.
If your fish oil capsules stink, have a lot of mishapes or are really sticky then the capsules probably aren't great. Poor capsules means oxidised and useless fish oil. Maybe try another supplier although most of them are produced by contract agencies.