High molecular weight hyaluronic acid for horse joint fluid. Hyaluronic acid is a natural substance that gives joint fluid its shock-absorbing properties and allows the joint surfaces to glide more easily against each other. The shock absorption and smooth movement help ensure that the joints have the right conditions for normal function. Recommended for horses that are actively training and participating in competitions, as well as for older horses showing joint stiffness or early signs of joint stiffness.