As red light therapy grows in popularity across Australia for skin health, pain relief, and recovery, questions around its safety are becoming more common, particularly concerns about whether repeated use could increase cancer risk.
Unlike ultraviolet (UV) radiation, which is known to damage DNA and contribute to skin cancer, red and near-infrared light used in red light therapy is non-ionising. These wavelengths are widely considered safe and are used to support cellular repair, reduce inflammation, and promote tissue healing. However, confusion often arises due to misunderstandings about how different types of light interact with the body.
This article examines how red light therapy functions, the current scientific research on its potential connection to cancer, and safe usage practices for at-home red light therapy kits.
Understanding How Red Light Therapy Works
Red Light Therapy, also known as photobiomodulation, uses specific wavelengths of red (typically 620-670 nm) and near-infrared light (800-1000 nm) to stimulate beneficial changes within the body’s cells. These wavelengths penetrate the skin at varying depths, reaching beyond the surface layers to affect deeper tissues without harming DNA.
At the cellular level, red and near-infrared light is absorbed by mitochondria, the energy-producing structures within our cells. This interaction enhances the production of adenosine triphosphate, the molecule responsible for powering most cellular functions. Increased ATP supports faster cell repair, reduced inflammation, and improved circulation, making it valuable for skin health, muscle recovery, and even wound healing.
The Difference Between Red and Ultraviolet Light
Unlike ultraviolet (UV) light, which carries enough energy to break DNA bonds and cause mutations, red and near-infrared light is non-ionising. This means it does not damage DNA or increase the risk of cancer when used correctly, which is one of the key reasons it’s considered safe for regular use in both clinical and home settings.
Our Red light therapy kits for home use, like the Premium Therapy Wrap, larger single and double high-performance pads, or a multi-purpose Head/Neck/Shoulder kit, our kits are designed to deliver these wavelengths safely at therapeutic levels. Quality devices typically list their irradiance (light power), wavelength, and recommended usage times, helping users get effective results while minimising risk.
Common Questions About RLT and Its Connection to Cancer
Can Red Light Therapy Cause Skin Cancer (Melanoma)?
The concern about red light therapy causing skin cancer, especially melanoma, is a common one, but it’s largely based on confusion with UV light exposure. Melanoma is primarily triggered by ultraviolet (UV) radiation, particularly from excessive sun exposure or tanning beds, which can damage the DNA in skin cells and lead to mutations. Red light therapy, on the other hand, uses visible red and near-infrared light, which are completely non-ionising. That means they do not have the energy required to break molecular bonds or disrupt DNA in the way UV light can.
Several reputable organisations, including the American Academy of Dermatology, have confirmed that red light does not carry the same risks as UV. Red light therapy is often used in dermatology clinics to support skin healing after procedures or reduce inflammation in chronic skin conditions. However, it’s still wise to take a personalised approach. If you have a history of melanoma, non-melanoma skin cancers, or conditions like actinic keratosis, it’s always best to consult your dermatologist before beginning red light therapy, just to ensure the therapy is right for your skin type and medical history.
Do the LED Lights in Red Light Therapy Devices Cause Cancer?
This is another worry that often crops up when people first learn about red light therapy. The good news? There is no credible evidence to suggest that properly used red light therapy devices can cause cancer. The LED panels or handheld units found in reputable RLT kits are engineered to deliver specific, therapeutic wavelengths, most commonly around 660 nm for red light and 850 nm for near-infrared. These lights are not like the high-intensity, broad-spectrum lamps used in tanning beds, which do emit harmful UV rays.
Quality devices are built to deliver consistent, narrow-band light that stays within the safe, non-ionising range. Studies conducted on red light therapy have consistently shown no link between red or near-infrared light and cancer development. Even in research involving cancerous cells, red light did not promote malignancy and sometimes even had a mild suppressive effect on tumour growth. Of course, using the device according to the manufacturer’s guidelines is crucial; more light or longer sessions don’t necessarily mean better results, and overuse could lead to skin irritation.
Does Red Light Therapy Emit Harmful Radiation?
The word “radiation” can sound scary, but not all radiation is created equal. Red light therapy uses non-ionising radiation, which means it doesn’t have the energy to knock electrons out of atoms or damage DNA. It sits in the visible to near-infrared spectrum, well outside the harmful zones where UV, X-rays, or gamma rays operate. It’s these ionising forms of radiation that are linked with cancer risk, not the light used in red light therapy.
Think of it like this: sunlight contains both safe and harmful wavelengths. UV rays are the culprits behind sunburn and skin cancer, but the red wavelengths present at sunrise and sunset are often used in therapeutic devices precisely because of their healing effects. Red and NIR light can support cell function, reduce inflammation, and promote regeneration without triggering oxidative stress or cellular mutation. As long as you’re using a well-designed device and following safety protocols, the “radiation” from red light therapy is not only harmless, it’s beneficial.
Scientific Research on Red Light Therapy and Cancer
No DNA damage observed
Research into red and near-infrared light therapy consistently supports its safety when used at therapeutic doses. Unlike ultraviolet or ionising radiation, red light (600–1000 nm) doesn’t damage DNA or lead to cancer-causing mutations.
Studies on cancerous tissue
One key study using mice with UV‑induced squamous cell carcinoma applied 670 nm light at 5 J/cm² twice daily. Over 37 days, this treatment did not promote tumour growth; on the contrary, it modestly reduced tumour size and improved surrounding tissue health.
Early-stage tumour treatment potential
Lab-based (in vitro) studies confirm RLT doesn’t break DNA strands or induce mutagenic changes. Instead, red light has been shown to boost mitochondrial function, decrease oxidative stress, and support cellular repair pathways. Systematic reviews also affirm its oncologic safety: photobiomodulation has been deemed safe for skin rejuvenation, even in individuals with a cancer history.
Comparison to UV
Furthermore, RLT is being explored as a complementary therapy in clinical cancer care, not through everyday home devices, but in controlled medical settings. It includes photodynamic therapy (PDT), where near-infrared light activates cancer-fighting drugs. There’s also growing use of RLT to ease side effects of cancer treatment, such as reducing oral mucositis or managing lymphedema . These protocols, however, are carefully dosed and supervised, differing significantly from consumer-level panels.
General Consensus
When used responsibly, red light therapy is safe and does not promote cancer, it’s non-ionising and backed by a solid body of evidence. Yet, therapeutic effects depend heavily on factors like wavelength, dose, and setting. If you’ve been diagnosed with cancer or are currently undergoing treatment, it’s wise to consult your healthcare provider before introducing any red light therapy regimen into your routine.
We ensure the quality of all our red light therapy kits by making them right here in Western Australia
How to Use Your Red Light Therapy Kit Safely and Effectively
Using a red light therapy kit at home can be a convenient and effective way to support skin health, manage minor aches and pains, or promote overall well-being. However, like any therapeutic tool, it’s essential to use it correctly to minimise unnecessary risks and achieve the best results. Here are some practical guidelines to help you make the most of your device.
Choose a Quality Device with Clear Specifications
Before starting, check that your kit includes information on:
Wavelengths – Look for near-infrared (around 830 nm) light. These are the most commonly researched for therapeutic use.
Power output and safety certifications – Ensure the product meets safety standards and includes usage instructions.
Follow Manufacturer Instructions
Each device will vary slightly, so always refer to the user manual for details on positioning, timing, and frequency. Avoid assuming that more exposure means better results; it doesn’t.
Use Consistent, Moderate Sessions with our Red Light Therapy Kits:
Duration: Depending on the pad, treatment sessions vary form 20 to 40 minutes per area per day. Treatment sessions can be longer on areas of chronic inflammation. No harm can be done from over use as the body will only absorb what it needs in any one session. Small animals require far less treatment time.
Frequency: 3 to 6 times per week, however if suffering from more chronic conditions, daily use may be recommended.
Distance: Our pads are designed for use directly onto the skin, Light will penetrate light cloth but heavy cloth will have a blocking effect.
Monitor Your Skin’s Response
Mild warmth or redness after a session can be normal. However, discontinue use and consult a health professional if you notice:
Persistent irritation
If you’re taking photosensitive medications or have any light-sensitive conditions, speak with your GP before using red light therapy.
Manage Expectations
Red light therapy is not a miracle cure, hen used correctly and consistently, it has consistently shown to support:
Pain relief and reduce inflammation
Support wound healing and tissue repair
Overall skin tone and texture improvement
Support athletic performance by aiding recovery
Support your sleep
Manage the symptoms of Arthritis
Patience and consistency are more effective than intensity or overuse.
A Red Light Therapy Kits Testimonial by Body Work Therapist – Geoff Russell
Used properly, red light therapy is not considered a cancer risk. These devices emit non-ionising light, which doesn’t damage DNA or encourage tumour growth. Research to date supports their safety when used as directed, and most quality kits are designed to meet clear safety standards.
As with any therapeutic tool, mindful use is key. That means following your kit’s instructions, protecting your eyes, and paying attention to how your body responds. If you have a history of skin cancer, are undergoing cancer treatment, or have complex medical conditions, it’s best to check in with a healthcare professional before starting.
For most people, though, a red light therapy kit can be a safe, practical addition to a wellness routine, supporting clearer skin, reducing inflammation, and promoting recovery without the concern of carcinogenic effects.
Explore our many testimonials and video stories, browse our range or get in touch if you have further questions.