What is X49? Using our patented form of phototherapy, the LifeWave X39® patch elevates the peptide GHK-Cu that is known to decline with age. Using technology backed by multiple clinical studies and 20 years of development, the LifeWave X49® patch has been demonstrated to provide a multitude of benefits. How do LifeWave Phototherapy Patches Work Your body emits heat in the form of infrared light. Our patches are designed to trap this infrared light when placed on the body, which causes them to reflect particular wavelengths of light depending on the patch. This process stimulates the nerves on the surface of the skin, which in turn produces specific health benefits that are unique to each LifeWave patch. For example how the Sun creates Vitamin D in the Body.