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Here's a question for anyone hoping to red light their way to a youthful complexion: Did you know that in dermatology red light treatment is used mostly for hair growth?

It begs a more serious question for those of us already using red light in our skincare routine: Are we hoping to smooth out those wrinkles just to end up looking like Wolverine?

 

 
The conundrum points to a larger issue with red light treatment, as the tools to harness its potential benefits become more available online as well as in spas, gyms and dermatology clinics. While it has gained a reputation as a multipotent ray of wellness, with claims that it can treat conditions from aging skin to erectile dysfunction, what does the research say?

 
Beyond that lie more questions. Can it be used safely? How is it changing the body at a cellular level? And, oh yeah: Are those using red light to reduce wrinkles destined for a surprise beard?

 
We turned to our Stanford Medicine experts for some red light answers — to explain the science of it, to decipher the research-backed uses for it and to parse the many things we still don't know about red light therapy.

FAQ

  • What is red light therapy?

    Red light therapy (RLT) is a treatment that uses low levels of red light to reportedly improve your skin’s appearance, like reducing wrinkles, scars, redness and acne. It’s also touted to treat other medical conditions.

    To date, there’s a lot of ongoing research, publication of small studies and much discussion on the internet about the effectiveness of red light therapy for all types of health uses. Results of some studies do show some promise, but the full effectiveness of red light therapy has yet to be determined.

  • How did interest in red light therapy evolve?

    NASA (National Aeronautics and Space Administration) originally began experimenting with red light therapy on plant growth in space and then to help heal wounds in astronauts. Like many developments, other potential uses began to be investigated.

    In fact, red light therapy is already widely medically accepted in its use in photodynamic therapy. In this therapy, low-power red laser light is used to activate a photosensitizer drug. The interaction creates a chemical reaction that destroys cells. It’s used to treat some skin conditions, including skin cancer and psoriasis, acne and warts, and other types of cancer.

    Now, RLT is being investigated (or already in use) for treating a wide array of health conditions. What’s confusing — and controversial — is the effectiveness of the treatment for the purposes it’s being promoted.

  • How does red light therapy supposedly work?

    Red light therapy is thought to work by acting on the “power plant” in your body’s cells called mitochondria. With more energy, other cells can do their work more efficiently, doing things like repairing skin, boosting new cell growth and enhancing skin rejuvenation. More specifically, certain cells absorb light wavelengths and are stimulated to work.

    Red light therapy may work in skin health to:

    Stimulate collagen production, which gives skin its structure, strength and elasticity.
    Increase fibroblast production, which makes collagen. Collagen is a component of connective tissue that builds skin.
    Increase blood circulation to the tissue.
    Reduce inflammation in cells.