Finish Line Horse Products Fluid Action Ha Powder Fluid Action HA provides the same great benefits as original Fluid Action with Sodium Hyaluronate (HA) added for extra support in preserving healthy joints. Improves joint function by lubricating joints and helping to maintain structural integrity. Increases the viscosity level of the synovial fluid in joints. Contains Glucosamine, yucca, MSM, Vitamin C, and many other beneficial ingredients.