Photobiomodulation — more commonly called red light therapy — uses specific wavelengths of light (typically 630–680 nm in the red spectrum and 800–850 nm in the near-infrared spectrum) to stimulate cellular processes. It is one of the more extensively studied biohacking tools, with applications in wound healing, muscle recovery, skin health, and, more recently, testosterone support. The Testosterone Connection The most specific claim about red light therapy and testosterone c