How Often Should You Use Red Light Therapy on Your Face for Wrinkles?

How to use it

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Written by Anna Katherine Page, who has used an LED mask three to four nights a week for two years. Last updated September 4, 2026.

How often should you use red light therapy on your face?

Two to three times a week. That is what nearly every published protocol uses, and it is the number I would give a friend without hesitation.

The reason this question is confusing is that device manufacturers recommend more. INIA suggests three to five times a week. Some brands say daily. Meanwhile the FDA clearance filed by the factory that builds INIA’s masks recommends “10 minutes a day, 3 times per week,” which is more conservative than the brand’s own marketing.

Here is what the research actually used.

Notice how narrow the real range is. Ten to twenty-one minutes, two or three times a week. Nothing in that table supports twice a day, and only one row supports five times a week.

Does three times a week work better than twice?

No, and this is the most useful single finding in the literature for anyone who owns a mask.

Bragato and colleagues, publishing in Lasers in Medical Science in 2025, randomised 95 women aged 45 to 60 into three arms: a red LED mask three times a week, the same mask twice a week, and a sham mask twice a week. Double-blind, sham-controlled, four weeks.

On the blinded specialist-rated Wrinkle Assessment Scale, there were no significant differences among any of the groups. Software-measured wrinkle length improved at the glabella and right periorbital sites. Satisfaction was high in both treated groups. The authors concluded that two weekly sessions appear sufficient.

I want to be straight about what that study shows, because it cuts both ways. The blinded human assessors could not see a difference between the treated women and the sham group at all. That is the best-designed facial trial in this field and its primary blinded outcome was null. It is also the trial that tells you three sessions buy you nothing over two.

How long should each session be?

Ten minutes for a consumer mask. That is what the devices are timed for and it is inside the published range.

The arithmetic matters more than the minutes. A mask putting out 30 mW/cm² for ten minutes delivers about 18 J/cm², which sits at the top of the 1 to 20 J/cm² band that Huang and Hamblin describe as standard for stimulation in photobiomodulation. Doubling the session to twenty minutes puts you at 36, which is outside it.

Most masks have a built-in ten minute timer and shut themselves off. That timer is not a limitation to work around. It is the dose.

Can you do red light therapy twice a day?

You can physically do it. I would not, and here is the specific reason.

Photobiomodulation follows what researchers call a biphasic dose response. Huang, Sharma, Carroll and Hamblin laid this out in Dose-Response in 2011, and their summary is blunt: “Within a decade of the introduction of LLLT in the 1970s it was realized that more does not necessarily mean better.”

The laboratory numbers behind that are striking. Fibroblasts irradiated at 632.8nm showed maximum proliferation at 2.5 J/cm² and cell damage at 10. Mouse fibroblasts at 810nm showed ATP production rising at 3 J/cm² and falling at 30. In a mouse traumatic brain injury model, the dose that worked as a single treatment, repeated daily for fourteen days, produced benefit for four days, nothing by day five, and by day fourteen the treated animals performed worse than untreated controls.

Two honest caveats. Every one of those inversion points comes from cells or rodents. There is no published human facial dose-ranging study establishing where the down-slope begins in skin, and the 2025 review says so directly: “at present, no consensus exists on optimal dosing parameters, including frequency and duration of use.”

So the case against twice a day is not that somebody proved it harmful in human faces. It is that nobody has established an upper bound, the underlying dose curve is known to invert, and the one trial that compared two frequencies found the lower one was enough. Doubling your exposure buys you no demonstrated benefit against an uncharacterised risk. That trade is bad.

Why doesn’t more red light therapy mean better results?

Because intensity is a separate variable from total energy, and this is the part that almost never gets explained.

Two experiments in the Huang and Hamblin review make the point cleanly. In a hamster oral mucositis model, 0.9 J/cm² delivered at 55 mW/cm² over 16 seconds reduced severity. The identical 0.9 J/cm² delivered at 155 mW/cm² over 6 seconds did nothing. In a rat wound model, 5 J/cm² at 4 mW/cm² improved tensile strength, and the same 5 J/cm² at 15 mW/cm² lost the benefit entirely.

Same joules. Different result. Which means “total joules” is not a sufficient description of a dose, and a brighter panel used for a shorter time is not equivalent to a dimmer one used for longer.

This is also why the LED mask marketing arms race over output figures is not the straightforward good thing it looks like. A higher irradiance number is not automatically better. It changes where you sit on a curve that nobody has mapped for human faces.

How long before you see results?

Four weeks at the absolute earliest. Six is more realistic, and that is what the FDA-cleared indication for this device class assumes.

Nothing credible in the published literature reports meaningful objective change before about four weeks. Bragato ran four. Lee ran four. Wunsch ran thirty sessions across roughly fifteen weeks. The acne literature, where blue light separates from comparators, shows that separation emerging at weeks four to eight with peak effect at twelve.

If you see a two-week before-and-after on social media, you are looking at lighting, hydration and camera angle. I say that as someone who posts before-and-afters. It is genuinely hard to shoot an honest one and almost nobody does.

There is one more gap worth knowing: durability after you stop is essentially unstudied. Cochrane’s criticism of the acne light literature was that fewer than half the trials assessed anything beyond eight weeks. Nobody can tell you what happens three months after you put the mask in a drawer.

What does a realistic routine look like?

Here is mine, after two years.

Three nights a week, ten minutes, on clean dry bare skin with nothing underneath. No serum, no oil, no SPF, no makeup, because anything on your face is between the light and your skin. Eye pads in. I do it lying down before bed, though the wireless mask I use means I have also done it while answering emails, which is the honest reason I have kept it up rather than any discipline on my part.

Moisturiser goes on a few minutes afterwards. I do not layer a retinoid on the same night, which is a caution based on barrier irritation rather than a documented interaction, and I explain the reasoning in whether you can use retinol or tretinoin with red light therapy.

The mask I use is the INIA GLOW, which measures about 30 mW/cm² independently, the same as a mask costing three times more. I wrote up what does and does not verify about it in my full two-year review.

Who should skip red light therapy for wrinkles?

Anyone who has not tried a retinoid first. Topical tretinoin for photodamage has a systematic review and meta-analysis of randomised trials behind it. LED has nothing of comparable weight for wrinkles. If your budget only stretches to one thing, the evidence points at the retinoid.

Anyone with melasma or a pigmentary disorder. Visible light is an established melasma aggravator and heat-generating devices are a recognised risk. This is a dermatologist conversation.

Anyone on photosensitising medication, or with a photosensitive dermatosis. The LED literature specifically flags screening for this.

Anyone who wants a result in two weeks. It does not happen in two weeks and a device that promises it is lying to you.

Frequently asked questions

Related reading: my two-year INIA mask review · does red light therapy work for dark spots · how to choose an LED mask on Amazon · the retinol serum I use