Be aware that glucosamine can, for a small number of people, have rather serious side effects.

I started using it and, within 3-4 days was freezing cold and suicidally depressed. Stopped the medication - it all went away. Tried again some month's later and back came the symptoms. I've never found this mentioned on the packs so, as with all new meds, try to be aware of any physical or mental changes when you start taking something.