"Biofreeze Professional" which is a 5% menthol formulation made specifically for clincial use. Why Biofreeze? Once a muscle or joint is injured, regular exercise is typically the key to rehabilitation. But when pain limits a body's ability to exercise, the healing process takes longer.Biofreeze products help break this pain cycle, by relieving pain through a method known as "Gate Control" or "gating." In the gating process, menthol acts to stimulate specific sensory receptors in the skin, thereby blocking other receptors from sending pain signals to the brain.Biofreeze products provide temporary relief from minor aches and pains of sore muscles and joints associated with simple backache, arthritis, bruises, strains and sprains.Biofreeze Pain Reliever may be used up to four times a day - both before exercise or therapy (to relieve painful movement), and afterwards (to soothe muscle or joint soreness). In some cases, Biofreeze products may even be used during exercises or therapy.