DMSO Liquid Solution is used to reduce joint inflammation and swelling in horses. Liquid is used topically on the skin. It works as an effective pain killer by blocking the nerve conduction fibers that produce pain. DMSO Liquid Solution for Pets stimulates healing of most injuries. DMSO is pure dimethyl sulfoxide liquid. This product is pyrogen free and acetone free. Oil Based Liquid form contains 99% DMSO. DMSO has been approved by the FDA for use in dogs, and horses.16 oz