Finish Line® Fluid Action® HA provides 25mg per ounce of Sodium Hyaluronate (HA), the stable and orally absorbable form of hyaluronic acid, for extra support to promote and preserve healthy joints. 
HA improves joint function by lubricating joints and helping to maintain structural integrity, and also increases joint synovial fluid viscosity. Unlike other products that can actually make the trouble worse by breaking down cartilage, Fluid Action HA contains no pain relievers, and works on the cause of the discomfort, and not just mask the symptoms. Also for use in dogs and cats. 
FLUID ACTION® HA has the following benefits for your horse: 
Supports and lubricates joints 
Eases joint stiffness due to normal daily exercise and activity