Are you by any chance allergic to shellfish? Glucosamine sulphate is generally shellfish derived.Does anybody have any recommendations on glucose amine supplements that are less likely to cause nausea? I've tried a few different dose levels and manufacturers and they all make me feel like vomiting!
As for alternatives, it depends on exactly what the problem is. If you PM me with some idea of what's up i may be able to point you in the right general direction.