I first started using Arthogen for my dog 4 years ago, mainly because of it's reasonable price. My dog was 7 years old when I first started supplementing her with Arthogen and is now 11 years old. At 7 years old, she was showing signs of stiffness in her hips, as she was slow and careful to pick her back end up when getting up, and also has trouble going up stairs. If she has gotten worse over the past 4 years, the change has been so gradual that I haven't noticed. She is not noticeably more sore or stiff, and I can only attribute this improvement to Arthogen together with the fish oil supplements I've also been giving her. She is still able to walk quickly and even run when she feels like it, which I feel is a success story. Very happy with the product!