Max Internationals primary product is Max GXL ( Glutathione Accelerator ). Created by Robert H. Keller, M.D., Max International states that the Max GXL product has been formulated to fortify the immune system and provide optimum health and greater athleti... moreMax Internationals primary product is Max GXL ( Glutathione Accelerator ). Created by Robert H. Keller, M.D., Max International states that the Max GXL product has been formulated to fortify the immune system and provide optimum health and greater athletic performance.