I’ve been using Feedmark products for over a year now. After trying so many shelf products and not seeing any difference, I decided to look into Feedmark. My little cob has very low grade arthritis, instead of going down the injections route, I researched into the products at Feedmark, he started on Feedmark extra flex and I have never turned back. Sound, pain free and no more sticky hocks! Amazing product! 100% recommend.