It's not a bad supplement by any means but I agree with @gearhead and feel that there are better options. Osteo bi-flex has a very similar profile to N2joint rx from n2bm.com but osteoporosis bi-flex only has 2.5g of active ingredients per serving where as N2joint rx has over 4g of active ingredients per serving.
This is the stack I recommend to any of my clients who are experiencing joint pain -