Myrstin Joint Supplement restores dog's joint health by repairing the T-cells that cause arthritis. This natural supplement works as a lubricant, helping muscles move more smoothly over bones, bursas and other muscles; an anti-inflammatory, using fatty acids to work on the inflammatory process; an immune system regulator, reprogramming cells that send a message for macrophage cells to attack joints; and a painkiller. Available in 120- count and 360- count bottles.