What red light therapy is
Red light therapy shines low levels of red or near-infrared light on the skin from LEDs or low-level lasers. The leading idea is that the light acts on mitochondria, the energy parts of cells, which may support collagen, circulation and calmer inflammation. Its full effectiveness hasn't been determined, and results can vary with the wavelength and power of the device.
It is different from photodynamic therapy, an established medical treatment that pairs red light with a light-activated drug for certain skin conditions and cancers.
How practitioners use it
Red light is a popular treatment for skin concerns such as signs of aging, and people also seek it for hair thinning and acne. It's offered by dermatologists and promoted at spas, salons, tanning salons, gyms and wellness centers.
- In a dermatologist's office, devices are more powerful, and the dermatologist can diagnose the problem first. Dermatologists usually use red light as a complementary therapy, adding it to a plan that may include a medicated cream, microneedling or a chemical peel.
- At home, masks and panels mostly use LEDs. They are generally safe but weaker, so results may fall short. A dermatologist may suggest one to keep up results after office treatment.
- A typical course means sessions one to three times a week for weeks or months. Session length depends on the device, so follow its directions. It isn't one and done, and not everyone sees results. Insurance usually doesn't cover it.
- At spas, gyms and salons, ask who runs the treatment and what device they use. Cleveland Clinic suggests a dermatologist or a qualified, trained cosmetic therapist.
What the research shows so far
| Use | Evidence strength | What studies show |
|---|---|---|
| Hereditary hair loss | Moderate: larger randomized trials | Large randomized trials found some regrowth and thicker hair; it won't restore a full head of hair |
| Wrinkles, texture, redness | Early to moderate | Some studies show subtle to noticeable improvement; best dose and schedule unclear |
| Acne, wound healing | Early | Some potential, but not enough evidence for most uses |
| Joint and tendon pain | Early, still under study | Under study for knee osteoarthritis, tendonitis, carpal tunnel and arthritis |
| Weight loss, cellulite, depression, cancer | Not shown so far | Not backed by scientific evidence yet |
What "FDA-cleared" means
At-home light devices for wrinkles can be cleared under FDA's device category for over-the-counter, light-based wrinkle reduction (21 CFR 878.4810, a Class II device reviewed through 510(k)). A 510(k) clearance means FDA found the device substantially equivalent to one already legally sold for the same use. It is not FDA approval.
The American Academy of Dermatology says clearance means FDA considers the device low risk; it says nothing about how well it works. "FDA approved" or "FDA certified" on a light device is not a meaningful label.
Safety and eye protection
- Wear the eye protection the device directions call for, every time. Don't swap in sunglasses.
- Follow the time and frequency in the directions. Overuse could damage skin or eyes.
- Used short-term as directed, it appears safe and isn't linked to side effects. Long-term safety isn't known.
- Darker skin tones can be more prone to dark spots from visible light; talk with a dermatologist first.
- Lupus or another condition that makes you sensitive to light can get worse with red light. Ask your clinician first.
See a clinician before trying red light for a new, changing or bleeding mole or spot, or a sore that won't heal. Those need diagnosis first.
Your call, with a good practitioner
Whether red light fits your goal is your decision. Questions to ask a provider:
- What device do you use, and is it FDA-cleared for the use I'm asking about?
- What eye protection do you provide?
- How many sessions do you plan, how often, and what does the full course cost?
- Is red light a fit for my skin tone and any light-sensitive condition I have?
Red flags: promises of weight loss, cellulite or cancer results, a device sold as "FDA approved" or "FDA certified," no eye protection, or treating a new or changing spot before anyone has diagnosed it.
Gabriel can help you find a dermatologist or qualified provider. Read about red light therapy sessions, or ask Gabriel free whether it fits your goal and your medications.
Common questions
Does red light therapy actually work?
For some uses, modestly. The best evidence so far is for hereditary hair thinning and mild skin aging; for most other uses, studies are small and early.
Are red light therapy masks worth it?
They are generally safe but weaker than in-office devices, so results may be smaller. They take regular use for weeks or months.
Is red light therapy safe for your eyes?
Use the eye protection the directions call for and follow the session limits. Overuse could harm the eyes.
Does FDA-cleared mean red light therapy is proven?
No. Clearance means FDA found the device substantially equivalent to one already sold and considers it low risk. It doesn't show how well it works.
Does red light therapy help with weight loss?
Studies haven't shown that red light therapy helps with weight loss or cellulite; those uses aren't backed by scientific evidence yet.
Does red light therapy cause cancer?
It doesn't use UV light, and current research hasn't found that it causes cancer. Long-term safety is still not fully known.
Sources
- Red light therapy Cleveland Clinic
- Red light therapy American Academy of Dermatology
- Product classification: light based over the counter wrinkle reduction (OHS) U.S. Food and Drug Administration
- Premarket notification 510(k) U.S. Food and Drug Administration
This guide is general information, not medical advice. It does not replace a visit with a licensed clinician. Gabriel membership is not health insurance.