I've been taking the Ultimate Bone Support for about 3 weeks now. I started taking it because my bone density scans haven't been coming back good and I really wanted to get serious about building up my bones. Of course it's too soon to repeat my bone density scan, but I can already tell a difference in my fingernails. They are growing like crazy and are super-strong, a definite difference from how they used to be. I also think the popping in my knees is better, so I feel like I must be on the right track and will look forward to seeing the improvement in my next scan.