Red Light Therapy for Long COVID: Emerging Protocols

Last updated: April 2026

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Quick Answer

Red light therapy (RLT), also called low-level laser therapy (LLLT), uses specific red or near-infrared light wavelengths to stimulate cellular activity, with WIRED testers reporting visible hair regrowth by February 27, 2026.
Photobiomodulation, the use of light waves to change human biology, has seen a boom in recent years for various purposes.
Dermatologists historically used red light for early-stage treatment of precancerous and early, thin skin cancers.
The CurrentBody Skin LED Red Light Therapy Face Mask: Series 2 has a 4.7-star rating from 3,054 reviews.

Red light therapy (RLT), also known as low-level laser therapy (LLLT), is a non-invasive treatment. It uses specific wavelengths of red or near-infrared light to stimulate activity within cells. This technology was originally developed to help heal wounds and reduce inflammation. Since then, its uses have expanded, including for skin rejuvenation, pain relief, and hair restoration. The underlying principle is photobiomodulation, which describes how light can alter human biology at a cellular level. In February 2026, WIRED testers saw visible hair regrowth when using red light therapy devices, highlighting its potential in this area. This expansion of use has led to a boom in photobiomodulation applications, both in medical clinics and for at-home use.

What is Red Light Therapy and Photobiomodulation?

Red light therapy (RLT) is a non-invasive treatment. It uses specific wavelengths of red or near-infrared light. This light stimulates activity within the body's cells. The treatment was first developed to help heal wounds and reduce inflammation. Over time, research has shown its potential for many other medical and cosmetic uses. This includes skin rejuvenation, pain relief, and hair restoration. The core idea behind red light therapy is photobiomodulation. This is the scientific term for using light to change human biology.

Understanding Photobiomodulation

Photobiomodulation involves light waves interacting with cells to alter their function. This interaction can lead to various biological effects. For example, it can boost cellular energy production and reduce oxidative stress. These changes at the cellular level are what drive the observed benefits of red light therapy. The field has seen a significant increase in interest in recent years. This is because the tools to use its potential benefits are now more available. You can find these devices online, in spas, gyms, and dermatology clinics.

How RLT Differs from Other Light Therapies

Red light therapy uses specific wavelengths, typically in the red and near-infrared spectrum. These wavelengths penetrate the skin to different depths. This allows them to reach various cell types. Unlike ultraviolet (UV) light, which can damage skin, red and near-infrared light are generally considered safe for therapeutic use. The goal is to stimulate, not damage, cells. This makes RLT a gentle yet powerful option for many concerns.

Cellular Mechanisms of Action

When red and near-infrared light hit cells, they are absorbed by chromophores. These are light-sensitive molecules within the cells. One key chromophore is cytochrome c oxidase, found in the mitochondria. Mitochondria are the powerhouses of our cells. When cytochrome c oxidase absorbs light, it can improve mitochondrial function. This leads to increased production of adenosine triphosphate (ATP), which is the energy currency of the cell. More ATP means cells can perform their functions more efficiently, whether it's repairing tissue, reducing inflammation, or stimulating hair growth. This cellular boost is the foundation of red light therapy's effects.

The increased cellular energy can also trigger other beneficial responses. These include the release of nitric oxide, which improves blood flow. It also includes the activation of certain signaling pathways that promote cell repair and regeneration. These complex cellular changes contribute to the wide range of reported benefits. The non-invasive nature of this treatment makes it appealing. It avoids the downtime and risks associated with more aggressive procedures.

The Rise of At-Home Devices

The availability of red light therapy devices has grown significantly. Many people now have access to these tools for use at home. This boom reflects a broader interest in wellness and non-invasive treatments. While medical clinics have long used photobiomodulation, the rise of consumer-friendly devices means more people can explore its potential benefits. However, it is important to understand what the science says and what it does not say. We need to look at specific, research-backed uses to ensure effective and safe application.

For instance, the CurrentBody Skin LED Red Light Therapy Face Mask: Series 2 has earned a strong reputation with a 4.7-star rating from 3,054 reviews, showing consumer confidence in at-home devices for skin health. Similarly, their LED Neck & Décolletage Mask: Series 2 also boasts a 4.7-star rating from 163 reviews. This suggests that people are finding value in these accessible devices for targeted treatments.

How Has Red Light Therapy Been Used Historically?

Before red light therapy became known in the beauty industry, dermatologists used it for specific medical purposes. Its early applications were focused on treating precancerous and early, thin skin cancers. This historical use provides a foundational understanding of red light's therapeutic potential. It also highlights the precision required for effective treatment.

Red Light in Photodynamic Therapy

Dermatologists used red light in conjunction with a topical drug. This combination is a type of treatment called photodynamic therapy. In this process, red light is applied at a specific wavelength. This triggers a reaction with the topical drug. The reaction then kills damaged or diseased skin cells. This allows for new, healthy skin to grow. It is important to note that red light alone does not destroy skin cancer. Its effectiveness in this context relies on its interaction with the photosensitizing drug.

Nour Kibbi, MD, a clinical assistant professor of dermatology at Stanford Medicine, explained this historical context. She stated, "Before red light gained a reputation in the beauty industry, dermatologists used it for early-stage treatment of precancerous and early, thin skin cancers." This shows a long-standing medical application of red light, predating its widespread use in cosmetics and wellness.

Evolution to Photobiomodulation

After its initial use in photodynamic therapy, red light began to be explored for a wider range of health and beauty concerns. This expansion largely harnessed the concept of "photobiomodulation." Zakia Rahman, MD, a clinical professor of dermatology at Stanford Medicine, elaborated on this shift. She noted, "Since then, red light has been used for a variety of new health and beauty concerns that largely harness something called 'photobiomodulation,' or the use of light to alter biology." This marks a transition from a destructive, targeted treatment to a more broadly stimulating and regenerative approach.

The evolution of red light therapy from a specific cancer treatment to a general wellness tool demonstrates its versatility. It also points to a deeper understanding of how light interacts with human cells. The ability of light to alter biology, rather than just destroy cells, opened up new avenues for research and application. This includes areas like anti-aging, pain relief, and hair restoration.

Precision and Wavelength Specificity

The historical use of red light in dermatology also emphasizes the importance of specific wavelengths. Different wavelengths of light penetrate tissues to varying depths and have different biological effects. In photodynamic therapy, the chosen wavelength for red light was crucial for activating the topical drug effectively. This precision is still a key factor in modern red light therapy applications. Ensuring the correct wavelength is used for a particular condition is vital for achieving desired outcomes.

The rigorous application in early dermatological settings laid the groundwork for current research. It encouraged a scientific approach to understanding how light interacts with the body. This legacy of precision and evidence-based practice continues to guide the development of new red light therapy protocols.

Distinguishing Medical and Cosmetic Uses

It is crucial to distinguish between the historical medical uses of red light and its newer cosmetic and wellness applications. While both fall under the umbrella of light therapy, their mechanisms and goals can differ significantly. Photodynamic therapy for cancer treatment is a highly regulated medical procedure. Modern photobiomodulation for hair growth or skin rejuvenation, while science-backed, operates in a different context. Understanding this distinction helps in evaluating claims and choosing appropriate treatments.

The insights from Stanford Medicine experts highlight this important difference. They help us decipher the research-backed uses from the many things still unknown about red light therapy. This critical perspective ensures that we approach red light therapy with a clear understanding of its proven capabilities and limitations.

Does Red Light Therapy Work for Hair Loss?

Yes, red light therapy, also known as low-level laser therapy (LLLT), is an increasingly popular treatment option for hair loss. Research and user experiences suggest that it can be effective in stimulating hair growth. This treatment works by using specific wavelengths of red or near-infrared light to encourage cellular activity in hair follicles.

Evidence for Hair Regrowth

One of the most compelling pieces of evidence comes from recent testing. WIRED's 2026 review of red light for hair growth reported that their testers saw visible hair regrowth with red light therapy devices by February 27, 2026. This finding provides a strong indication of the therapy's effectiveness in a real-world setting. Hair loss affects millions of people globally, and the emotional impact of thinning hair can be significant. This makes exploring science-backed treatments like RLT very important.

Western Reserve Dermatology also notes that red light therapy has been studied for various medical and cosmetic uses, including hair restoration. The treatment is non-invasive, making it an attractive option for those looking to address hair loss without surgical procedures. It targets the hair follicles at a cellular level, aiming to revitalize them and promote healthier, stronger hair growth.

How RLT Stimulates Hair Follicles

Red light therapy works by stimulating cellular activity within the hair follicles. The specific wavelengths of light penetrate the scalp and are absorbed by the cells. This process, known as photobiomodulation, enhances mitochondrial function. When mitochondria work better, they produce more energy (ATP). This increased energy can help dormant hair follicles become active again. It can also extend the growth phase (anagen) of existing hair.

The improved cellular function also leads to better blood circulation in the scalp. Enhanced blood flow delivers more nutrients and oxygen to the hair follicles. This creates a healthier environment for hair growth. Additionally, red light therapy can reduce inflammation in the scalp. Inflammation is sometimes a contributing factor to hair loss. By addressing these underlying issues, RLT aims to promote thicker, fuller hair.

At-Home Devices for Hair Growth

The market offers various red light therapy devices specifically designed for hair growth. These include helmets and caps that allow for convenient at-home treatment. For example, the CurrentBody Skin LED Red Light Hair Growth Helmet has a 4.6-star rating from 108 reviews. This high rating suggests that many users have found success with the device.

These devices typically use LED (light-emitting diode) technology to deliver the therapeutic red and near-infrared light. They are designed for ease of use, allowing individuals to incorporate red light therapy into their routine without frequent clinic visits. The consistency of treatment is often key to seeing results with hair growth therapies.

What the Science Says About Hair Loss

Hair loss can be caused by many factors. These include genetics, stress, hormonal imbalances, medical conditions, or nutrient deficiencies. Red light therapy addresses some of these underlying issues by improving the cellular environment for hair growth. While it may not be a cure-all for every type of hair loss, the scientific community recognizes its potential. Stanford Medicine experts, while noting red light's use in dermatology for hair growth, also emphasize that there are still many things we don't know. This underscores the need for continued research and careful evaluation of individual results.

Despite the remaining questions, the existing evidence, including visible regrowth reported by WIRED testers, makes red light therapy a promising option. It offers a non-invasive way to stimulate hair follicles and improve scalp health. For those experiencing thinning hair, exploring LLLT could be a valuable step towards restoration.

What are the Broader Claims and Scientific Basis for Red Light Therapy?

Red light therapy has gained a reputation for treating a wide range of conditions, from aging skin to erectile dysfunction. This broad appeal stems from its fundamental mechanism: photobiomodulation. Photobiomodulation is the use of light to alter biology at a cellular level. This means that red light therapy can potentially influence various biological processes, leading to diverse health and beauty benefits.

The Core Mechanism: Photobiomodulation

At its heart, red light therapy works by stimulating cells to function more efficiently. When red and near-infrared light penetrate the skin, they are absorbed by mitochondria within the cells. This absorption boosts mitochondrial activity, leading to increased production of adenosine triphosphate (ATP). ATP is the primary energy currency of the cell. With more energy, cells can repair themselves, regenerate, and perform their specific functions more effectively. This cellular boost is the scientific basis for many of the claims associated with red light therapy.

Zakia Rahman, MD, a clinical professor of dermatology at Stanford Medicine, highlights this core concept. She notes that red light is used for "a variety of new health and beauty concerns that largely harness something called 'photobiomodulation,' or the use of light to alter biology." This emphasizes that the diverse applications all trace back to this fundamental cellular interaction.

Beyond Hair Growth: Skin Rejuvenation and Pain Relief

While hair growth is a prominent application, red light therapy is also studied for other significant benefits. One major area is skin rejuvenation. The therapy can help improve skin health by stimulating collagen production, reducing fine lines, and enhancing overall complexion. This is due to the same cellular activation that benefits hair follicles. Increased cellular energy and improved blood flow contribute to healthier, more youthful-looking skin. For more details, see Stanford Medicine's insights on red light therapy science.

Another key area of study is pain relief. Red light therapy's ability to reduce inflammation and promote tissue repair makes it a candidate for managing various types of pain. This includes muscle soreness, joint pain, and even chronic conditions. The anti-inflammatory effects help to calm irritated tissues, while improved circulation aids in the healing process.

Addressing a Range of Conditions

The wide array of claims for red light therapy stems from its ability to impact fundamental cellular processes. If a condition involves cellular dysfunction, inflammation, or impaired healing, then red light therapy might offer a potential benefit. This is why claims extend from aging skin to conditions like erectile dysfunction. However, it is crucial to differentiate between scientifically backed uses and speculative claims.

Stanford Medicine experts emphasize the need to understand what the research says—and doesn't say. While photobiomodulation holds promise for many conditions, robust scientific evidence is still emerging for some of the broader claims. For example, while red light has gained a reputation as a multipotent ray of wellness, with claims that it can treat conditions from aging skin to erectile dysfunction, we must consider what the research specifically supports.

Safety and Cellular Changes

Questions about safety and how red light changes the body at a cellular level are important. Generally, red light therapy is considered non-invasive and safe when used correctly. The key is using specific wavelengths and appropriate dosages. Unlike UV light, red and near-infrared light do not damage cells. Instead, they aim to optimize cellular function.

The cellular changes go beyond just ATP production. They can also involve the modulation of reactive oxygen species, which play a role in cellular signaling and stress response. The therapy can also influence gene expression, promoting the production of beneficial proteins and enzymes. These complex interactions contribute to the regenerative and anti-inflammatory effects seen with RLT. Understanding these cellular mechanisms helps to validate the therapy's potential. It also guides the development of new and more effective protocols.

Can Red Light Therapy Offer Skin Rejuvenation?

Yes, red light therapy is a non-invasive procedure that can offer powerful anti-aging benefits and boost overall skin health. It works by stimulating cellular processes within the skin, leading to improvements in appearance and texture. Many individuals have found that RLT can be a transformative option for skin rejuvenation, moving beyond the assumption that only surgical procedures can achieve such results.

Promoting Collagen and Elastin Production

One of the primary ways red light therapy benefits the skin is by stimulating the production of collagen and elastin. Collagen is a protein that provides structure and firmness to the skin. Elastin gives skin its elasticity and ability to bounce back. As we age, the production of these proteins naturally decreases, leading to wrinkles, fine lines, and sagging skin. Red light therapy, through photobiomodulation, encourages fibroblasts—the cells responsible for producing collagen and elastin—to become more active.

This increased cellular activity helps to rebuild the skin's support structure. The result is skin that appears firmer, smoother, and more youthful. The therapy essentially helps the skin to regenerate itself from within, rather than just treating surface symptoms.

Reducing Fine Lines and Wrinkles

By boosting collagen and elastin, red light therapy can effectively reduce the appearance of fine lines and wrinkles. The improved structural integrity of the skin helps to plump it up, making existing wrinkles less noticeable. Regular use can also help prevent new wrinkles from forming by maintaining a healthy and resilient skin matrix. This makes RLT an appealing option for those seeking a non-surgical approach to anti-aging.

Many users report visible improvements in their skin's texture and tone. For example, the CurrentBody Skin LED Red Light Therapy Face Mask: Series 2 has received a 4.7-star rating from 3,054 reviews, indicating high user satisfaction with its skin-rejuvenating effects. Similarly, the CurrentBody Skin LED Neck & Décolletage Mask: Series 2, designed for an often-neglected area, also boasts a 4.7-star rating from 163 reviews. These ratings reflect real-world results experienced by a significant number of people using these devices.

Improving Skin Tone and Texture

Beyond wrinkles, red light therapy can also enhance overall skin tone and texture. It helps to reduce redness, inflammation, and hyperpigmentation. The therapy improves blood circulation, which brings more oxygen and nutrients to the skin cells. This leads to a healthier, more radiant complexion. Additionally, the anti-inflammatory effects can be beneficial for conditions like acne and rosacea, helping to calm irritated skin and promote healing.

The ability of red light to promote cellular repair also means it can help improve the appearance of scars and blemishes. By encouraging the growth of new, healthy skin cells, it can lead to a more even and smooth skin surface. This comprehensive approach to skin health makes red light therapy a versatile tool in aesthetic dermatology.

A Non-Invasive Alternative

For those who are hesitant about surgical procedures or more aggressive treatments, red light therapy offers a gentle, non-invasive alternative. It provides powerful anti-aging benefits without the downtime, risks, or discomfort associated with injections or surgery. This makes it accessible to a broader audience looking to maintain or improve their skin's appearance.

The availability of at-home devices, like those from CurrentBody, further enhances this accessibility. Users can integrate treatments into their daily routines. This consistency is crucial for achieving and maintaining optimal results. The focus on enhancing the skin's natural regenerative processes aligns with a holistic approach to beauty and wellness.

What Do Experts Say About Red Light Therapy?

Experts from institutions like Stanford Medicine have provided valuable insights into red light therapy. They help to explain the science behind it, decipher its research-backed uses, and clarify what is still unknown. Their perspectives are crucial for understanding the true potential and limitations of this growing field.

Deciphering the Science

Stanford Medicine experts emphasize that photobiomodulation, the use of light waves to change human biology, has seen a boom. This boom includes applications in medical clinics and at home. They aim to clarify what the science truly says and what it does not say about red light therapy. This critical approach helps separate well-supported claims from those that require more research.

According to Nour Kibbi, MD, a clinical assistant professor of dermatology at Stanford Medicine, dermatologists historically used red light for early-stage treatment of precancerous and early, thin skin cancers. This involved photodynamic therapy, where red light was applied with a topical drug to kill damaged skin cells. This historical context shows a foundational medical use for red light, even before its beauty industry reputation.

Primary Use in Dermatology: Hair Growth

One significant point highlighted by experts is that in dermatology, red light treatment is used mostly for hair growth. This insight helps to focus expectations and understanding. While red light therapy is often marketed for various skin concerns, its role in stimulating hair follicles is a particularly well-documented application within the dermatological community. Western Reserve Dermatology on red light for hair loss further supports this, explaining that red light therapy, also known as low-level laser therapy (LLLT), is a popular treatment option for hair loss.

This focus on hair growth is further supported by observations from independent testers. As of February 27, 2026, WIRED testers reported seeing visible hair regrowth with red light therapy devices. This practical evidence, combined with expert insights, strengthens the case for red light therapy as a viable option for hair restoration.

The Broader Scope of Photobiomodulation

Zakia Rahman, MD, a clinical professor of dermatology at Stanford Medicine, explains how the applications of red light have expanded. She notes that "red light has been used for a variety of new health and beauty concerns that largely harness something called 'photobiomodulation,' or the use of light to alter biology." This broader understanding acknowledges the therapy's potential beyond just hair. It recognizes its ability to influence cellular processes for various health and beauty benefits.

This means that while hair growth might be a primary dermatological use, the underlying mechanism of photobiomodulation opens doors to other applications. These include skin rejuvenation, pain relief, and potentially other areas where cellular function can be improved. However, Dr. Rahman's statement also implies that each new application needs careful scientific scrutiny.

What We Still Don't Know

Despite the growing popularity and promising results, experts also point out the many things we still don't know about red light therapy. Questions remain about optimal dosages, wavelengths, treatment durations, and the long-term effects for various conditions. For instance, while it has gained a reputation as a multipotent ray of wellness, with claims that it can treat conditions from aging skin to erectile dysfunction, the research still needs to catch up for all these claims.

Stanford Medicine experts are actively working to provide answers to these questions. They are trying to explain how red light therapy changes the body at a cellular level and if it can be used safely across all its claimed applications. Their insights underscore the importance of ongoing research and a balanced perspective when considering red light therapy. We must rely on evidence-based practices and consult healthcare professionals for specific medical advice.

Frequently Asked Questions

What is the main purpose of red light therapy in dermatology?

In dermatology, red light treatment is primarily used for hair growth. Experts like Nour Kibbi, MD, a clinical assistant professor of dermatology at Stanford Medicine, also note its historical use in photodynamic therapy for early-stage skin cancers, where it was combined with a topical drug. This shows its dual role in both stimulating growth and assisting in targeted cell destruction when paired with other treatments.

Is red light therapy safe?

Red light therapy is generally considered safe because it is non-invasive and uses specific wavelengths that do not damage cells. However, experts from Stanford Medicine emphasize the need to understand how it changes the body at a cellular level and to ensure it can be used safely for all its claimed benefits. Always follow device instructions and consult a healthcare provider, especially for specific medical conditions.

Can red light therapy help with skin aging?

Yes, red light therapy is a non-invasive procedure that offers powerful anti-aging benefits and boosts overall skin health. It works by stimulating collagen and elastin production, which can reduce fine lines and wrinkles. For example, the CurrentBody Skin LED Red Light Therapy Face Mask: Series 2 has a 4.7-star rating from 3,054 reviews, indicating positive user experiences with skin rejuvenation.

What is photobiomodulation?

Photobiomodulation is the scientific term for using light waves to alter human biology. Zakia Rahman, MD, a clinical professor of dermatology at Stanford Medicine, explains that red light therapy harnesses this process to address a variety of health and beauty concerns. It involves light stimulating cellular activity, particularly within mitochondria, to promote healing and regeneration.

Where can I find red light therapy devices?

Red light therapy devices are widely available both online and in various physical locations such as spas, gyms, and dermatology clinics. You can find a range of devices, from full-body panels to specialized masks and helmets for specific concerns. For instance, the CurrentBody Skin LED Red Light Hair Growth Helmet has a 4.6-star rating from 108 reviews, showing its availability and user satisfaction.