Make sure it is glucosamine sulfate, not glucosamine HCL; stick at 2 grams per day. Same with the chondroitin. Both have long half lives, so 1x dosing is fine. Be aware that too high of ingestion of glucosamine sulfate has been linked with increased insulin resistance (however, I haven't seen too many studies to support this). I tend to go heavier on chondroitin for this reason, but medically studied dosages are in the 1500 - 2000 mg range for both compounds.
If you want to add to the stack, add in 10 grams hydrolized collagen per day, again 1x dosing is fine. Also, add in niacinamide at 1000 -1200 mg/day over 4 doses.