Is red light therapy safe?
Red light theraphy alsocalled photobiomodulation or low-level light therapy) has been gaining more and more attention in recent years. It is used in skin care, tissue repair, pain relief, and other areas. This therapy is increasingly being chosen not only by clinics, but also by people at home, so it is important to answer the question - is red light therapy safe?
Current scientific evidence shows that When used properly, red light therapy is generally considered safe., especially during short-term use. However, safety depends on the specific device, light wavelength, intensity, dose, duration of use, and the individual's health status.
In this article, we will review what scientific research says about the safety of red light therapy, what the potential risks are, and how to use it responsibly.
What shows that red light therapy is safe?
1. Short-term side effects are usually minimal
In clinical trials conducted to date, serious side effects have been rare. Mild and temporary reactions, such as skin irritation, sensitivity, a feeling of warmth or minor discomfort, have been more commonly described.
2025 in the magazine Journal of the American Academy of Dermatology published in the evidence-based consensus of photobiomodulation experts It is stated that photobiomodulation is considered a safe form of therapy for adults. Experts also noted that red light photobiomodulation does not cause DNA damage.
American Academy of Dermatology also states that short-term use of red light is considered relatively safe, with the most commonly reported side effects being mild and temporary skin irritation or soreness.
2. Red light is not ultraviolet radiation
Red light is fundamentally different from ultraviolet (UV) radiation. UV rays can damage cellular DNA and are associated with skin cancer risk, while red and near-infrared light used for photobiomodulation operate in a different range of the electromagnetic spectrum.
This is one of the most important reasons why red light therapy should not be confused with tanning beds or UV therapy.
The 2025 expert consensus also emphasizes that red light photobiomodulation is not associated with DNA damage. However, this does not mean that any light intensity or any device is automatically safe - specific usage parameters are important.
3. Clinical data on photobiomodulation is growing
Photobiomodulation is being studied in a variety of medical fields, from skin and hair care to pain and tissue healing. However, recent research also shows why it is important not to overestimate its potential.
2025 announced A review of 204 randomized clinical trials found positive effects for some conditions, but the certainty of evidence remained low or moderate for many of the outcomes assessed.
A similar situation is seen in wound healing studies. Some analyses suggest potential benefits, but a 2026 systematic review highlights the large differences in wavelengths, doses, and treatment protocols used. Therefore, the results of one study cannot be automatically applied to all red light devices used at home.
4. Studies in children provide more data on eye safety
Red light is also being studied in the field of controlling the progression of myopia in children. Here, special repeated low-intensity red light (RLRL) devices, so these results should not be directly compared to conventional whole-body red light panels.
In 2024, published 12 months in the study No significant damage to retinal function or structure was detected, but the researchers noted certain changes in retinal indicators, the long-term significance of which they recommended further monitoring.
Even more important is 2024. systematic security review, which included 20 studies and 2,380 children and adolescents. It found no cases of permanent vision loss, and the most common symptom was a transient afterimage (afterimageHowever, a rare case of reversible visual impairment and retinal changes has been described in the literature.
The 2026 reviews therefore draw a more cautious conclusion: short-term results are mostly favorable, but long-term ocular safety limits and doses for different devices have not yet been definitively established.
Potential dangers and what is important to know
1. Long-term use data is still lacking
One of the most important unanswered questions is not whether red light can be used for a few weeks or months, but what happens when it is used regularly for many years.
American Academy of Dermatology emphasizes that the long-term effects of red light on skin and hair are not yet fully known. There is also no single, universal optimal intensity, duration, and frequency that is suitable for all devices.
Therefore, short-term safety studies should not be interpreted as evidence that unlimited daily use for many years is completely safe.
2. A higher dose does not necessarily mean a better result
The effect of photobiomodulation is dose-dependent. Not only the wavelength is important, but also the light intensity, distance from the body, duration of the procedure, and the total amount of energy delivered to the tissues.
For this reason, a more powerful panel should not necessarily be used for longer or from a shorter distance. Recent systematic reviews identify the large differences in doses and protocols used as one of the main reasons why results from different studies are difficult to directly compare.
Excessive or improper use can cause skin sensitivity, discomfort, and in the case of some light devices, even burns.
3. Photosensitizing diseases and medications require caution
Red light therapy may not be suitable for people whose skin or body is unusually sensitive to light.
American Academy of Dermatology recommends consulting a dermatologist before use if a person has a photosensitive disease, such as lupus, or is taking medications that increase photosensitivity.
A review of photobiomodulation published in 2025 also highlights some photosensitizing drugs and substances, such as tetracyclines or St. John's wort. In such cases, it is important to assess the individual risk before using therapy.
4. Eye protection depends on the specific device
Intense light can pose a risk to the eyes, so you should not look directly at the LEDs or laser source for long periods of time.
However, there is no single rule that safety glasses are always necessary when using every red light device. American Academy of Dermatology recommends following the instructions for the specific device: if the manufacturer recommends using eye protection, it should be used during every session and not replaced with regular sunglasses.
Particular caution should be exercised with high-intensity devices and equipment intended for use near the face and eyes.
5. Skin pigmentation can change how it reacts to light
Recent literature has increasingly focused on the fact that people with different skin tones may respond differently to visible light.
American Academy of Dermatology notes that people with darker skin tones may be more sensitive to visible light and have a higher risk of hyperpigmentation. 2026. in a scientific review on skin pigmentation and photobiomodulation It is also emphasized that melanin content can alter light penetration into tissues, and skin pigmentation is still not sufficiently assessed in many current protocols.
This does not mean that people with darker skin cannot use red light therapy, but the same parameters will not necessarily be optimal for every person.
6. Some medical conditions require a doctor's consultation
In the past, it was often stated that red light therapy should not be used at all for people who have had cancer. More recent scientific data does not support such an absolute statement.
In a systematic review of the oncological safety of photobiomodulation There is no clinical evidence to suggest that appropriate use of PBM for skin rejuvenation increases the risk of new or recurrent malignancy. Photobiomodulation is also used in medicine to manage some of the side effects of oncological treatment.
However, in the presence of active tumor or unclear skin lesion in the treatment area, you should not direct red or near-infrared light to that area yourself. In such cases, the appropriateness of the therapy should be assessed by a doctor.
Caution is also required during pregnancy, in the presence of photosensitizing diseases, in the use of photosensitizing medications, or in the presence of active skin lesions in the treatment area.
How to use red light therapy safely?
The safety of red light therapy depends not only on the technology itself, but also on how it is used. Different panels and other devices can vary greatly in their power, wavelengths, and recommended distance.
Therefore, when using red light therapy at home, it is important to:
- Choose a device from a reliable manufacturer whose technical specifications clearly state wavelengths, light intensity, and usage recommendations;
- Follow the manufacturer's recommended distance from the skin, session duration, and frequency of use;
- Don't start with maximum exposure just because the device allows you to choose it;
- Use eye protection if specified in the instructions for the specific device and do not look directly at the intense light source;
- Discontinue use if unusual or prolonged skin irritation, pain, vision changes, or other symptoms occur;
- Consult a doctor if you are taking photosensitizing medications, have a photosensitive disease, an active or unclear skin lesion, or another medical condition that raises questions about the suitability of therapy.
It is also important to distinguish between the devices themselves. A clinical trial result obtained using a device with a precisely defined wavelength and dose does not automatically prove that any red light panel on the market has the same effect or safety.
Conclusion
Current scientific evidence shows that red light therapy, used within the appropriate parameters, is relatively safe for most people, and short-term side effects are usually mild and temporary. In 2025, expert consensus considered photobiomodulation to be a safe form of therapy for adults, but research does not yet answer all the questions about long-term and very frequent use.
It is important to understand that red light is not a one-size-fits-all treatment. Safety is affected by wavelength, light intensity, dose, distance, duration of treatment, device design, and individual characteristics.
- Short-term use of properly dosed red light is generally considered safe;
- red light is not UV radiation and its mechanism of action is different;
- a higher dose of light does not necessarily mean greater benefits;
- long-term daily use data is still insufficient;
- Eye protection should be used in accordance with the safety instructions for the specific device;
- If you are taking photosensitizing medications or have certain health conditions, it is worth consulting with your doctor before therapy.
We recommend
For those looking for the greatest possible security and transparency when choosing a red light therapy panel, we recommend paying attention to: Dermfix. The brand relies on more than 20 years of experience in the field of phototherapy and medical devices, and substantiates technical parameters not only with declarations, but also with specific measurements, including irradiance tests performed with a spectrometer and the specified measurement distance. Not all manufacturers of consumer red light panels provide this level of technical transparency.
Read more about Dermfix in the m8s7 article „"Dermfix Review: From Medical Phototherapy to Advanced Red Light Panels"“.