Glucosamine (C6H14NO5) is a dietary supplement distributed as a salt -- commonly, but not limited to, glucosamine HCl, glucosamine sulfate potassium, and glucosamine sulfate sodium. Common dosages of glucosamine are 1,500 mg per day. The salt (e.g. glucosamine sulfate * KCL, glucosamine sulfate * NACL) forms are necessary to stabilize the glucosamine sulfate, whereas glucosamine HCl is stable without requiring a salt to be bound to it.