A year and a half later I confirm again that it works for me like magic. I want to emphasize that I was not asked for this review, nor getting any free product. Here is the story. After finishing the first bottle, for the reason I don't remember, I decided to buy a different brand of glucosamine. It was probably also working for my joints because I didn't experience any pain. But it was making me feel dizzy. I'd stop for a while and start again and every time I felt dizzy. So I stopped it all together. A few months later my knees started hurting again and I remembered my own praise for Doctor's Best glucosamine. Now I am back on track: one capsule a day (maybe it is enough for highly sensitive people?) and the knee pain is gone from the day one. Amazing! I have to mention that when I started Doctor's Best almost two years ago I also experienced Dizziness at first (just didn't know it could be related) but it improved within a few days. When I restarted this time, there were no side-effects at all. And you know what? I think it works for my dog too. A few months ago our 9 year-old Yorkie started hesitating and sometimes completely refusing to jump up just a few steps on the stairs. The vet didn't see anything wrong with her joints. We decided to start adding a tiny bit of glucosamine in her food once a day and see if that helps. Within a week she started jumping stairs again without hesitation. Keep in mind that our dog is also on a perfect anti-inflammatory diet: all homemade, mostly organic, no junk food at all. ------ I rarely write reviews for the supplements because it's hard to determine whether this particular supplement is actually working. This time something amazing happened, so I want to share it; maybe it will help someone else. For a few weeks I'd been feeling mild but persistent pain in my both knees that did not allow me to walk stairs freely like I used to. When I bought this Glucosamine Chondroitin MSM I was hoping that within a few weeks of taking it my knees will start feeling better. The unexpected magic happened! I took just one capsule in the evening and I woke up next morning without any discomfort in my knees! I know... can it be really so potent?! Maybe it's just a coincidence but it also could be a synergistic effect and the final piece of the puzzle is in its place. In addition to my diligent anti-inflammatory diet, I take Fish Oil, Turmeric and Boswellia for quite a while now. It seems to be working for me pretty well because most of the time I don't even feel any signs of arthritis that was haunting me many years ago. Now I added Glucosamine Chondroitin MSM and all my joints are happy. I still take just one, sometimes two, capsules a day instead of recommended 4. It works! Try it. Highly recommend