Deep-penetrating Gel formula contains HA for counter-irritant use on horses, ponies and dogs for the temporary relief of muscular soreness, stiffness and swelling caused by exposure, overwork or exertion. Helps reduce swelling, increases blood flow and stimulates circulation for long-lasting heat sensation - provides a cool flash followed by soothing warmth that lasts for over an hour. Contains 4% menthol, 0.4% MSM and 10 mg/fl oz hyaluronic acid. Apply sufficiently to affected area and gently massage. Do not wrap if applied vigorously; do not apply heat.