The Science Behind Red Light Therapy

A science first explanation of how specific light wavelenghts interact with cells and tissues in the body.

What Is Red Light Therapy ?

Red light therapy also called photobiomodulation (PBM) uses specific wavelenghts of red and near infrared light applied to the body's surface to interact with cellular processes. It is a non invasive, non thermal form of light therapy studied across multiple reseach fields.

Why Specific Wavelenghts Matter

Different wavelenghts of light penetrate tissues to different depths:

  • Red light (600-660 nm) primarily affects surface level tissues.
  • Near infrared light (800-900+ nm) can penetrate deeper below the skin.
  • Together, they cover a broader range of tissue depth and cellular interaction. This distinction matters for how the light is absorbed and what cellular processes it can influence.

How Light Interacts With Cells

At the cellular level:

• Certain light wavelengths are absorbed by components inside cells particularly in mitochondria, often termed the “energy producers” of the cell.

• When absorbed, light can interact with these cellular structures and may support natural biochemical pathways such as energy production.

Scientific evidence suggests that this process is linked to modulation of cellular energy (ATP), inflammatory pathways, and signaling processes in cells.