Glucosmine is usually available combined with chondroitin, which is shark catriledge ~ might that be a variety of "fish oil"? If so, it might counterbalance any negative effects of the glucosamine.

I am very happy with the results of taking G+C for the past few years; I hadn't heard that it triggered depression in some folks. Jacqui, you have my sympathy ~ it's really too bad you weren't able to take advantage of a treatment that is so effective for many people.