What is the LifeWave X39 Patch The LifeWave X39 patch is a device about the size of a quarter that you stick on your skin. While as best as I can tell it does not actively emit new light itself like a bulb, it is claimed to expose the skin to only certain wavelengths of light. Here are the instructions: “Place one LifeWave X39™ patch on the body, use one of the locations shown below. Apply the patch to clean, dry skin in the morning. Patches may be worn for up to 12 hours before discarding. Keep well hydrated while using this product.” They state that the X39 patches do several medical-related things via that light exposure: “Activate your stem cells! Patented phototherapy is designed to elevate a peptide known to enhance stem cell activity Supports relief of minor aches and pains. More energy and better sleep – must be experienced to be believed Supports natural wound healing process Maintains healthy inflammatory response” No solid clinical trial data for LifeWave patches? The LifeWave website instructs users to place the X39 patch on the skin of the back of the neck. How would one little patch placed there impact systemic things like the claims related to improved sleep and wound healing elsewhere? As mentioned in the previous section, these patches are claimed to work by activating your stem cells.