Can skin hear? What the research on sound and cells shows, and what reaches your skin from a pair of headphones

In 2025 a Kyoto laboratory showed that cells with no ears change what they do when sound reaches them. Here is that study, the older work on sound and skin cells, and a plain account of how much of it applies to a track played through headphones.

Sophie Kazandjian
October 2026 · 8 min read

Part of: The Science →

Most of what I write here is about the route from sound to skin that runs through the nervous system: a tone settles the body, cortisol comes down, sleep deepens, and skin that spends less of the night under stress hormones repairs itself better. That route is well supported and it is the one the app is built on. A second question sits underneath it, and it is the one people ask me most often in slightly different words: whether sound also does something to skin directly, as a physical pressure on the cells, with no ear and no brain involved.

Until recently nobody had looked closely. In April 2025 a group at Kyoto University published the first careful account of what happens inside cells when sound reaches them, and it is worth reading slowly, because it is the beginning of an answer.

The Kyoto study: 145 genes change when cultured cells are played sound

Masahiro Kumeta and colleagues built a small rig that drives sound straight into a culture dish through a diaphragm, so the cells sit in the pressure wave rather than hearing it across a room. They played three sounds: a 440 Hz tone (the A a piano is tuned to), a 14 kHz tone near the top of hearing, and white noise, each at around 100 pascals of pressure. Then they sequenced which genes the cells were expressing.

After two hours, 42 genes had shifted. After a day, 145 had, with the clearest changes in Ptgs2, the gene for the COX-2 enzyme that makes prostaglandins, and Ctgf, a growth factor involved in connective tissue. Within an hour of the sound starting, the cells had spread out and were gripping the dish over 15 to 20 per cent more area. All three sounds did roughly the same thing, which suggests the cells were responding to pressure rather than to pitch.

The mechanism they traced is the interesting part. The sound increased phosphorylation of focal adhesion kinase, the protein cells use to sense how hard they are being pulled on by their surroundings, and when that kinase was blocked with an inhibitor the whole response disappeared. Downstream, COX-2 raised prostaglandin E2, which signalled through the EP4 receptor to switch on the rest of the sound-responsive genes. Cells, in other words, were treating sound the way they treat any other mechanical force on their membrane, through the same machinery that lets a fibroblast feel the stiffness of the tissue around it. That is the finding the headlines reduced to "your cells can hear", and it is an accurate reduction.

The group then tested nine cell lines and found that pre-fat cells responded most strongly. Played sound continuously over the first three days of becoming fat cells, those precursors expressed the two master genes of fat formation, Cebpa and Pparg, at a fifth and a quarter of normal levels, and the amount of fat they eventually stored fell by 13 to 15 per cent. Two hours of sound a day for three days gave about a 30 per cent reduction in the same markers. A single day's exposure did nothing measurable.

What the pressure in that rig tells us

The pressure in that rig deserves a moment, because it tells you what kind of finding this is. Sound pressure of 100 pascals in air would be about 134 decibels, far beyond anything you would listen to, and the authors note that at that level in liquid they could not fully separate the sound wave itself from the stirring of the culture medium. The cells were also mouse cell lines in a dish, bathed in the wave on every side, rather than skin on a face with air in between.

So this is a study about what cells are capable of, and on that question it is clear: cells carry the equipment to sense sound and they use it. How much of a gentle tone through headphones reaches the skin of the face as pressure is a separate question, and a much smaller number, which is why the routines in the app lean on the ear and the nervous system to do the work. More on that below.

Sound and skin cells: the earlier studies

Kyoto's paper is the most thorough, but it is not the first time sound has been shown to move skin cells. In 2010 Mitsuhiro Denda and Masashi Nakatani, working in Shiseido's research laboratories, stripped the barrier from the skin of hairless mice with tape and then played sound at the wound for an hour. At 10, 20 and 30 kHz the barrier recovered faster than in silence, with 20 kHz the most effective, and the effect still held with the speaker three centimetres from the skin. Under the electron microscope, the 20 kHz skin was secreting more lamellar bodies, the packets of lipid that keratinocytes release to rebuild the barrier. A 5 kHz tone did nothing. The frequencies that worked are at the very top of human hearing or just past it, so this was keratinocytes responding to something the mouse would barely have heard.

In 2016 a group at Liverpool John Moores University put human and mouse fibroblasts, the cells that make collagen, on a vibrating plate and swept it from 0 to 1,600 Hz. Five minutes at 100 Hz made both cell types migrate faster across a scratch, the standard laboratory stand-in for wound closure, and the cells grew the actin structures, lamellipodia and filopodia, that cells use to crawl. Frequencies above 100 Hz slowed migration in proportion to how high they went. Nothing killed the cells.

A 2020 Keio University study added a detail that complicates any simple story. Vibrating a dish of fibroblasts at 11.2 kHz sped up their collective migration when the wave ran across the gap they were closing, and slowed it when the wave ran along the gap. The direction of the vibration decided whether it helped, and doubling its strength cancelled the benefit.

A systematic review in the International Wound Journal in May 2025 gathered these and two bone studies and reached an encouraging verdict: infrasound and audible sound can influence cell migration, proliferation, collagen-related signalling and barrier recovery in laboratory and animal models, the mechanism runs through mechanotransduction, and the next step is to find the frequency, intensity, duration and direction that work best in people. Five small studies, each pointing the same way, with the human trials still to come.

What this means for a sound routine at home

Taken together, the laboratory work says that skin cells are mechanically sensitive, that sound is a mechanical force, and that at the right pressure and frequency sound can nudge keratinocytes to rebuild a barrier and fibroblasts to move. Those are real findings and I expect the next decade of research to build on them. Each one used a transducer on the dish or a speaker a few centimetres from bare skin, which is a different arrangement from a tone in your headphones, where the sound goes to the eardrum and on into the nervous system. That is the route the app is built around, and it is the one with human studies behind it.

In a study of healthy women, a stressful task delayed recovery of the skin barrier while cortisol and inflammatory cytokines rose (Altemus and colleagues, 2001), and the research on the science page traces the rest of the chain: steady sound lowers stress markers, lower stress protects the barrier, and deeper sleep is when the repair happens. A June 2026 randomised trial added to that side of the ledger, finding that students with poor sleep who listened to a 3 Hz binaural beat for half an hour before bed, five nights a week for a month, reported less stress than those given pink noise or nothing and slept better from the second week.

So the answer to the question in the title is yes. Skin cells can sense sound, and in the laboratory they respond to it, which makes the whole field more interesting than it was a year ago. At home, the sound that reaches your skin most surely is the sound that changes your evening: twenty minutes lying still under a tone you find beautiful, with the mask or serum you already own doing its work on a face that is no longer braced against the day. The free ten-minute routine is the simplest way to feel what that is like, and the app has fourteen more for when you want to make it a habit.

If you work in this area and want to argue with any of it, the email is at the bottom of the page. The studies are linked below, and I would rather be corrected than quoted.

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