Opti Muscle 4,8 / 5 Independent Feedback based on 5 verified reviews. Trusted Customer Works a treat on my youngstee Ms Lorraine Holloway 1 month ago. It has helped my veteran maintain muscle Ms Lorraine Holloway 3 months ago. Very good product to assist with muscle recovery Miss Becky Clare 8 months ago. Palatable and contains everything he needs to help his PSSM Mrs Susan Cox 8 months ago. My Endurance horses look in great condition with using Opti Muscle. They have to work hard so using this product I know their system is well supported.