Do nail lamps damage DNA? What the 2023 study shows, and what it does not
A 2023 UC San Diego study shone nail lamp light on cells in a dish and found DNA damage and mutations. No human cancer data yet. Simple ways to protect your hands.
- The 2023 study used cells grown in a dish, not people. Light from a nail dryer killed cells, damaged DNA and caused mutations.
- The researchers themselves said a long-term study in people, at least a decade, is needed to know whether skin cancer risk rises.
- Dermatologists see the risk from occasional manicures as low, but UV exposure adds up over a lifetime.
- You can cut the light on your hands easily with fingerless gloves or sunscreen on the backs of your hands.
In 2023 a study from UC San Diego made headlines along the lines of “nail lamps damage DNA”. It did find that light from a nail dryer damaged the DNA of cells grown in a dish and caused mutations. But it did not study people, and there is still no data showing that people who wear gel get more skin cancer. This article reads the study in full, both sides, and then sums up what you can actually do.
If you are not sure how UV and LED lamps differ, read UV and LED nail lamps first.
What the study did
The team published in Nature Communications on 17 January 2023. They exposed three kinds of cells to light from a UV nail dryer:
- adult human skin keratinocytes (outer-layer skin cells)
- human foreskin fibroblasts
- mouse embryonic fibroblasts
There were two exposure patterns:
- Acute: 20 minutes, a one-hour rest, then another 20 minutes.
- Chronic: 20 minutes a day for three days in a row.
What it found
| Measure | Result |
|---|---|
| One 20-minute session | About 20-30% of cells died |
| Three consecutive 20-minute sessions | About 65-70% of cells died |
| Surviving cells | DNA and mitochondrial damage, raised reactive oxygen species |
| Mutations | Increased with the dose of light; some DNA damage was not repaired over time |
The university’s news story said the mutation patterns resembled those seen in people with melanoma. That is the part that made the news.
What the study does not show
- It was not done in people. These were cells in a dish, not the skin on someone’s hands at a manicure.
- There is no human cancer data. The researchers said a long-term epidemiological study, likely taking at least a decade, would be needed to confirm whether skin cancer risk really rises.
- It does not say how often is risky. The researchers said more work is needed on how risk differs with frequency of use.
The study shows “a worrying mechanism”. It does not show “gel manicures cause cancer”. Those two statements are far apart.
What dermatologists say
- Harvard Health (2021) cites a 2014 JAMA Dermatology study concluding that UVA from a gel manicure every two weeks is probably not high enough to raise skin cancer risk significantly. It also notes that lamps sold as LED emit mostly UVA too.
- MD Anderson (2025), reviewed by a dermatologist, says nail lamps do not currently appear to be a serious skin cancer concern, but UV exposure adds up over a lifetime, so frequent users and higher-risk people (fair skin, lots of past sun, previous skin cancer) should cut exposure. It also cites a 2014 study of 17 lamps in 16 salons: UVA output varied widely, but even the strongest lamps did not seem to pose a serious risk from a single visit.
Worked example: 20 lab minutes against one manicure
Use the made-up label from gel nails at home: cure each layer for 60 seconds.
- One hand gets 4 cures (base, two colour coats, top) = 4 × 60 = 240 seconds = 4 minutes.
- One 20-minute session in the study = 20 ÷ 4 = the same as 5 manicures on one hand.
- The three-day chronic pattern = 60 minutes = 15 manicures on one hand.
- Gel every 3 weeks is about 17 sessions a year, so one hand gets roughly 17 × 4 = 68 minutes a year, spread across the year.
These numbers do not prove safety or danger: lamps differ in strength, and cells in a dish are not the skin on your hand. But they show that the experiment packed a lot of light into a short time, which is different from manicures weeks apart.
Simple ways to cut the light on your hands
| Method | How it helps | Watch out |
|---|---|---|
| Fingerless gloves | Cover the skin, leave the nails open | Choose UV-protective ones, and keep the fabric off the nails |
| Sunscreen on the backs of your hands | Less UV on skin | Keep it off the nail plate or gel will not bond |
| Cure for the label time, no longer | No extra light for nothing | Under-curing is also bad: uncured gel raises allergy risk |
| Switch to regular polish some of the time | No lamp needed | Does not last as long, see making regular polish last |
Common mistakes
- Sharing the headline without noticing it was cells in a dish. That leads to either too much fear or, once people find out, ignoring it entirely. Both miss the point.
- Thinking LED lamps have no UV. Both kinds emit UVA.
- Curing longer than the label “just in case”. The label time is enough. Extra time is just extra light on your hands.
- Getting sunscreen on the nail plate. The gel lifts sooner, and you end up redoing it more often.
- Not watching your skin and nails. If anything on your hands or nails changes in an unusual way, check the signs in nail signs to see a doctor and see a doctor.
If you have a light-sensitive skin condition or take medicine that makes you sensitive to light, ask your doctor before using a nail lamp. This article is general information, not a diagnosis.
Sources
- DNA damage and somatic mutations in mammalian cells after irradiation with a nail polish dryer — Nature Communications 2023 (PubMed)
- UV-emitting nail polish dryers damage DNA and cause mutations in cells — UC San Diego Today
- Safety of LED nail lamps — Harvard Health Publishing
- Is your gel manicure safe? — MD Anderson Cancer Center
FAQ
Should I stop wearing gel?
The evidence is not enough to say who should stop. If you have gel often, burn easily with fair skin, have had skin cancer, or take medicine that makes you light-sensitive, cut exposure with gloves or sunscreen, switch to regular polish some of the time, and talk to a dermatologist.
Are LED lamps safer than UV lamps?
Lamps sold as LED also emit UV, mostly UVA. The advice on protecting your hands applies to both.
Will sunscreen stop my gel sticking?
Put it on the backs of your hands and fingers and keep it off the nail plate, because cream on the nail stops gel bonding well. Or use fingerless gloves instead.
General guidance. Products differ between brands: always follow the label. If you react to a product, see a doctor.