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. 

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 improve your skin’s appearance, like reducing wrinkles, scars, redness and acne. It’s also touted to treat other medical conditions. 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  and psoriasis, acne, & eczema.

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.

For what skin conditions is red light therapy being tried?

Red light therapy is promoted as a treatment for some common skin conditions, including to:

• Improve wound healing.
• Reduce stretch marks.
• Reduce wrinkles, fine lines and age spots.
• Improve facial texture.
• Improve psoriasis, rosacea and eczema.
• Improve scars.
• Improve skin hydration.
• Improve hair growth in people with androgenic alopecia.
• Improve acne.

Is red light therapy effective?

Most experts say that they don’t know yet if RLT is effective for all its claimed uses. Most say that the studies published so far show some potential for certain conditions, but that more studies need to be conducted. Red light therapy is still an emerging treatment that’s generating growing interest. But at this point in time, there’s not enough evidence to support most uses.

The gold standard of studies to determine if a product is effective is a randomized, placebo-controlled trial. This means that a certain number of people with the same range of characteristics (age, weight, race, sex, etc.) get either the study treatment or a placebo (fake or “sham” treatment) for treatment of the same condition.

Is red light therapy safe?

Red light therapy appears to be safe and isn’t associated with any side effects, at least, if used short-term and as directed. This therapy isn’t toxic, not invasive and not as harsh as some topical skin treatments. Unlike the cancer-causing ultraviolet (UV) light from the sun or tanning booths, RLT doesn’t use this type of light.

However, if products are misused — perhaps used too often or not according to directions — there’s a chance your skin or eyes (if not protected) could be damaged. The long-term safety of devices that use red light therapy isn’t yet known.

Are devices purchased for at-home use a safe, reasonable option?

You’ll find many red light therapy products if you search on the internet. While these products are generally safe to use, they may be less powerful than devices that may be used by dermatologists or other trained skin professionals. You may not get the results you hope for.

If you do choose to purchase a red light therapy device, make sure to shield your eyes for protection, follow all directions and take good care of the device.

In addition to medical office-based use and at-home use with a purchased device, you may see RLT being promoted at beauty spas and salons, saunas, tanning salons, gyms and wellness centers. Be cautious of who is supplying and where you are receiving treatment. It’s always best to check in with a medical professional about the best options to treat your skin condition or issue.