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Red light is everywhere now. Masks, wands, belts, panels the size of a door. Some of what is promised has been earned in careful trials. Much of it has been borrowed from those trials and stretched. Here is how I sort the two, and where I would begin.
What red light is
The research name is photobiomodulation. It uses red light (roughly 630 to 670 nanometres) and near-infrared light (roughly 800 to 850 nanometres) at low, non-heating doses. The working theory is that these wavelengths are absorbed by light-sensitive molecules in the mitochondria, which sets off a cascade of signalling in the cell (Avci et al., 2013). It is gentle, it is not a tanning bed, and it does not work by warming the skin.
Where the evidence is strongest: skin
In a controlled trial, 136 volunteers were assigned to red or broader-spectrum light twice a week, or to no treatment. After 30 sessions, the treated groups showed improved complexion and skin feel, smoother skin on profilometry, and higher collagen density on ultrasound, and blinded reviewers of their photographs confirmed the improvement compared with controls. The broader spectrum did no better than red light alone (Wunsch & Matuschka, 2014).
That last detail matters when you shop. More colours and more wavelengths are not automatically more effective.
Hair, with a caveat
In a set of double-blind trials with a sham device, 141 women and 128 men with pattern hair loss used a low-level laser comb three times a week for 26 weeks. Treated women gained about 20 terminal hairs per square centimetre, against about 3 with the sham device (Jimenez et al., 2014). The caveat is that this was a specific laser device, used on the scalp, not a face mask or a full-body panel.
Where it stops
A 2021 review describes photobiomodulation as "a highly commercialized interest", marketed for everything from facial rejuvenation to fat loss, and notes that the lack of regulatory standards makes efficacy hard to judge. Much of the laboratory evidence also comes from lasers, while most home devices use LEDs, which are not the same thing (Glass, 2021).
One more distinction: many devices are “FDA-cleared”. Clearance generally means the agency accepted that a device is substantially equivalent to one already on the market. It is not the same as approval, and it does not mean every claim on the box has been proven.
- Promising
- Skin texture, fine lines and collagen density, with consistent use over months.
- Promising
- Pattern hair thinning, for devices with their own trials.
- Wait
- Fat loss, “detox”, and whole-body longevity claims made for home panels.
Established: strong, repeated human evidence. Promising: real signals, not yet settled. Wait: interesting, but not yet worth your money on its own.
How to use it well
- Consistency over intensity. The skin trial ran twice a week for 30 sessions. A device you use three times and then store will do nothing.
- Follow the distance and time the manufacturer gives. Closer and longer is not better.
- Protect your eyes with the goggles supplied, especially with near-infrared, which you cannot see.
- Ask your clinician first if you take medication that makes you sensitive to light, or have an eye or skin condition.
What to check before you buy
- Stated wavelengths. Look for red and near-infrared in the ranges above, published clearly.
- Published irradiance at a stated distance. A serious brand tells you how much light reaches your skin, and from how far.
- Third-party testing of those numbers, not just the brand’s own claim.
- Size for the job. A handheld for the face or a small area; a panel only if you will use it on larger areas, often.
- Warranty and return period, so you can find out whether it becomes a habit.
A closing thought
Light is the quietest of the five pillars. It does not shock the body the way cold does, or hold it the way heat does. It simply asks you to come back, again and again, for months. If you can give it that, the evidence for your skin is genuinely encouraging. If you cannot, no device will do it for you.
The Trove's October issue, Issue No. 04: On Light, goes further: sunlight and the circadian clock, red light graded in The Light Truth, and a buyer's checklist for home devices. It is free to read; subscribe and the next issue reaches you first.
The body holds the work. These are the tools that hold the body.
— Gillian
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Sources
All verified via PubMed, October 2026.
- Avci P, Gupta A, Sadasivam M, et al. Low-level laser (light) therapy (LLLT) in skin: stimulating, healing, restoring. Semin Cutan Med Surg. 2013;32(1):41–52. PubMed 24049929
- Wunsch A, Matuschka K. A controlled trial to determine the efficacy of red and near-infrared light treatment in patient satisfaction, reduction of fine lines, wrinkles, skin roughness, and intradermal collagen density increase. Photomed Laser Surg. 2014;32(2):93–100. doi:10.1089/pho.2013.3616 · PubMed 24286286
- Jimenez JJ, Wikramanayake TC, Bergfeld W, et al. Efficacy and safety of a low-level laser device in the treatment of male and female pattern hair loss: a multicenter, randomized, sham device-controlled, double-blind study. Am J Clin Dermatol. 2014;15(2):115–127. doi:10.1007/s40257-013-0060-6 · PubMed 24474647
- Glass GE. Photobiomodulation: a review of the molecular evidence for low level light therapy. J Plast Reconstr Aesthet Surg. 2021;74(5):1050–1060. doi:10.1016/j.bjps.2020.12.059 · PubMed 33436333
The MitoPRO price range is carried over from the Trinket Trove homepage; confirm current prices with each brand before purchase.
This article is for education and is not medical advice. If you take medication that increases sensitivity to light, or have an eye or skin condition, speak with your clinician before using a light device, and always protect your eyes.
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