The X39 stem cell patch X39 Patch stands out for its innovative approach to stimulating stem cells, promoting natural healing without the use of drugs. The X39 patch is a breakthrough in regenerative medicine, designed to activate the body’s own stem cells. Unlike traditional pain relief patches that work by delivering medication, this patch uses phototherapy to stimulate cellular regeneration. The X39 stem cell patch is applied to the skin, where it interacts with body heat to emit specific wavelengths of light.