I usually don't write reviews for products that I buy, but I have to write one for this product. I am soon to be 58 years old and I am still active in sports (softball mostly) however, my knees had starting hurting so much that I dreaded doing anything. I started taking the CUR-Q10 ULTRA and, low and behold, I was playing in a game one night and starting running out onto the field and I wasn't hurting. I literally started jumping up and down I was so excited! Since then I have not only continued to order CUR-Q10 ULTRA for myself, but I have also ordered bottles for friends and teammates, and they all love it too!