Red Light Therapy · Safety
Can Red Light Therapy Cause Cancer?
It's a fair question, and asking it before your first session is exactly the right instinct. Here's what red and near-infrared light actually are, why they're in a different category from UV, and the real risks worth understanding.
The Short Answer
No UV, No Ionizing Radiation, No Established Cancer Link
Current evidence does not indicate that red light therapy causes cancer. The reason comes down to what kind of light it is. Red (around 660nm) and near-infrared (around 850nm) wavelengths contain no ultraviolet radiation. UV is the wavelength class most strongly associated with skin cancer risk, because it carries enough energy per photon to damage DNA in skin cells. Red and near-infrared light sit at the opposite end of the visible spectrum, carry far less energy, and are classified as non-ionizing.
That distinction matters more than anything else on this page. The mechanism that links sun exposure and tanning beds to skin cancer, cumulative UV damage to skin cell DNA, is simply not present in a red light therapy device. Research on photobiomodulation, the formal name for red light therapy, has been conducted for decades without establishing the kind of cancer risk associated with UV exposure.
Bottom line: red and near-infrared light are non-ionizing and contain no UV, the wavelength class tied to skin cancer risk. "No established link" is not the same as "impossible," and long-term research continues, but the physics of the light itself is fundamentally different from what makes tanning beds dangerous.
The Root of the Fear
Why People Worry About Red Light Therapy and Cancer
The concern is understandable, and it usually traces back to one visual association: a red light therapy bed looks a lot like a tanning bed. You lie down inside a glowing enclosure, the light is intense, and decades of public health messaging have correctly taught us that tanning beds raise skin cancer risk. The mental shortcut of "glowing bed, therefore cancer risk" is doing most of the work here.
There's also a broader, reasonable instinct at play: light powerful enough to change something in your body sounds like light powerful enough to harm it. That instinct is worth taking seriously, which is why the answer shouldn't be "don't worry about it" but rather a clear explanation of which kinds of light are hazardous and which aren't.
The hazard from sunlight and tanning beds was never "light" in general. It was always ultraviolet radiation specifically. Once you separate those two ideas, the cancer question becomes much easier to reason about.
Key Distinction
How Red Light Therapy Differs From Tanning Beds and UV
| Feature | UV Tanning Bed | Red Light Therapy |
|---|---|---|
| Light emitted | Ultraviolet (UVA/UVB) | Red (~660nm) and near-infrared (~850nm) |
| Ionizing or DNA-damaging? | UV damages DNA in skin cells | Non-ionizing, no UV content |
| Established skin cancer link | Yes, well documented | No, current evidence does not indicate one |
| Goal of exposure | Cosmetic tanning via UV | Photobiomodulation: cellular energy support |
| Typical session | Varies, cumulative UV dose adds up | 15 minutes in the Prism Light Pod |
The resemblance between the two devices is entirely cosmetic. A tanning bed is a UV delivery system. A red light therapy pod is a UV-free LED array tuned to wavelengths that research has explored for cellular energy production, recovery, and skin health, not for tanning. There is no bronzing effect from red light because there is no UV to trigger melanin production in the first place.
The Evidence Picture
What the Research Broadly Indicates
Photobiomodulation has been studied for decades across dermatology, sports medicine, and rehabilitation settings, and red light therapy is generally considered low-risk when used as directed. Notably, red light has even been studied in supportive cancer care settings, for example in managing certain treatment side effects, under medical supervision. That is very different from claiming red light treats cancer, which it does not, but it is a signal of how differently the medical community regards these wavelengths compared to UV.
Two honest caveats belong in any trustworthy answer. First, the long-term effects of frequent, years-long use of consumer devices are still being studied, so "no established link" reflects the current state of evidence rather than a final verdict. Second, evidence quality varies by use case: some applications of red light therapy are better studied than others.
What the evidence does not show is the pattern that emerged clearly and repeatedly for UV: a dose-dependent relationship between exposure and skin cancer. That pattern is the reason tanning beds carry warnings. No comparable pattern has been established for red and near-infrared light.
Honest Answers
Are There Real Red Light Therapy Dangers to Know About?
"Is red light therapy safe" is really a question about a handful of practical, manageable risks. None of them involve cancer, but they're worth knowing before your first session:
Photosensitivity and medications
Certain antibiotics, retinoids, and other medications can make skin more reactive to light. If you take a photosensitizing medication or have a photosensitivity condition, check with your prescriber before booking.
Eye comfort
The LEDs are bright, and staring directly at them can cause temporary strain or afterimages. Keeping your eyes closed or wearing the goggles your provider offers handles this completely.
Overuse and skin irritation
More is not better. Very long or overly frequent exposure with high-intensity devices may cause temporary redness or irritation. Sticking to recommended session lengths avoids this.
Device quality differences
Consumer devices vary widely in wavelength accuracy, power output, and build quality. Underpowered devices may do little, and poorly made ones are harder to use safely and consistently. Device class matters more than most buyers realize.
Curious about the eye question specifically? We covered it in depth in Is Red Light Therapy Bad for Your Eyes?
Extra Caution
Who Should Talk to a Provider First
"Generally considered low-risk" is not the same as "right for everyone without a second thought." A few groups should have a quick conversation with their doctor before starting:
This article is general information, not medical advice, and it is not a substitute for a conversation with your healthcare provider. Red light therapy does not treat, cure, or prevent cancer or any disease. If any of the above applies to you, talk to your doctor before your first session.
At MindBody Med Seattle
Why Device Quality Is the Risk You Can Actually Control
Most of the practical concerns above come down to device quality and sensible use. MindBody Med in Ravenna is the only chiropractic clinic in the area with a full-body Prism Light Pod: a medical-grade, FDA-registered device with calibrated 660nm and 850nm wavelengths, automated 15-minute programs, and goggles available at every session. No UV, no guesswork about output or wavelengths, and staff on hand if you have questions.
Zero UV output
Red and near-infrared wavelengths only
FDA-registered
Medical-grade device, not a consumer panel
15-minute sessions
Automated programs, goggles provided
Common Questions
Can red light therapy cause cancer?
Current evidence does not indicate that red light therapy causes cancer. Red and near-infrared light are non-ionizing and contain no ultraviolet radiation, which is the wavelength class associated with skin cancer risk from sun exposure and tanning beds. Research on photobiomodulation has been conducted for decades without establishing a cancer link. That said, long-term research is still ongoing, and anyone with a history of cancer should talk to their oncologist or physician before starting.
Is red light therapy the same as a tanning bed?
No. Tanning beds emit ultraviolet radiation, which damages DNA in skin cells and is well established as a skin cancer risk. Red light therapy devices emit red and near-infrared wavelengths that contain no UV. The two look superficially similar, which is where much of the confusion comes from, but the light itself is fundamentally different.
Is red light therapy safe?
Red light therapy is generally considered low-risk when used as directed. The most commonly reported side effects are mild and temporary, such as skin redness or eye strain from staring at bright LEDs. People with photosensitivity, those taking photosensitizing medications, and anyone with a history of skin cancer should talk to a healthcare provider before starting.
Who should avoid red light therapy or check with a doctor first?
Talk to your doctor first if you have a history of skin cancer or eye cancer, take photosensitizing medications such as certain antibiotics or retinoids, have a photosensitivity condition, or are pregnant. This is a short conversation that removes the guesswork, and a reputable provider will encourage it.
Still Have Questions? Ask Us in Person, First Session Free
Experience the Prism Light Pod at MindBody Med in Seattle's Ravenna neighborhood. 15 minutes, goggles provided, no UV, and your first session is free.