Best Horse Joint Supplement for Stiffness UK (2026 Expert Guide) If your horse is stiff, struggling to warm up, or not moving as freely as they used to, you’re likely already looking for a solution. Joint stiffness is one of the most common issues affecting horses — from leisure riding to high-level performance. But here’s what most owners discover: 👉 Not all joint supplements work. Why many horse joint supplements don’t deliver results The majority of joint supplements are