Red Light Therapy and the Brain: Neurological & Psychological Effects

Written by: Benjamin Caleb Williams

Red light therapy is best known for its skin, joint, and recovery benefits—but some of the most exciting research now focuses on the brain. Early studies suggest that specific red and near‑infrared wavelengths may help protect neurons, support blood flow, and influence inflammation and regeneration inside the central nervous system. That has sparked growing interest in whether regular red light therapy sessions could complement conventional care for stroke, traumatic brain injury, neurodegenerative conditions, or even mood disorders.

Unlike UV light, which mainly affects the surface of the skin, red and near‑infrared light can penetrate several centimeters into tissue, where they interact with mitochondria in neurons and supporting cells. This interaction appears to influence cellular energy production, oxidation–reduction balance, and signaling pathways involved in inflammation, repair, and plasticity. Because the therapy is non‑invasive, typically well‑tolerated, and relatively easy to deliver, researchers are actively studying how to optimize dose, timing, and delivery methods—including helmets and full‑body panels—for brain health applications.

In this article, we will review the scientific foundations of red light therapy, compare it with UV light, and explore emerging evidence for neurological and psychological benefits. We will also highlight why device quality and tissue penetration matter if you are considering Mito Red Light or similar systems as part of a long‑term brain‑support strategy.

Key Takeaways:

• Red light therapy is a growing field with established benefits and newly explored neurological applications.
• Research suggests red light therapy may positively impact traumatic brain events, degenerative diseases, and neuropsychiatric disorders.
• The therapy is believed to work by stimulating cellular mitochondria, influencing energy production, inflammation, and regeneration.
• Compared to UV light, red light has a longer wavelength allowing for deeper tissue penetration and effects beyond the skin.
• Future research will focus on optimizing delivery methods and further understanding the mechanisms and efficacy of red light therapy for neurological health.

Written by: Benjamin Caleb Williams

Red light therapy is a more recent technological advance that began to gain popularity in the 1990s as the LED technology needed to efficiently use this form of therapy became practical and as its potential applications were better understood. Red light therapy is used by many people for a variety of purposes, including managing pain, improving workout performance, promoting wound healing, and much more.

Like most newer forms of medically related technology, the field of red light therapy is experiencing rapid expansion, with new applications still being discovered and existing benefits becoming more fully understood. While research is still ongoing into many of the uses of red light therapy, the results people are seeing from therapy are causing this trend to grow in popularity.

One of the newest potential applications for red light therapy that is only beginning to be studied is the possible neurological and psychological effects that it may offer. Recent research has shown promise in reducing the size of stroke injuries, protecting brain cells, and even treating neurological diseases like Parkinson’s disease and Alzheimer’s disease.

The Science of Red Light Therapy

Red light therapy, at its core, involves illuminating an area of tissue with specific wavelengths of red or near‑infrared (NIR) light. The light penetrates into the tissues and is thought to stimulate cells to bring about positive effects.

To someone who has never heard of red light therapy, the concept may initially sound like something that does not have a solid scientific basis. The basic underlying principles of red light therapy, however, have sound scientific precedent and are logically grounded.

Light and the Body

The best way to illustrate how rays of red light could affect the body is to examine the well‑established effects that other types of light have on physiology.

Ultraviolet (UV) light, which makes up about 10% of the light produced by the sun, has several well‑documented effects on the body. UV light has been conclusively shown to:

• Stimulate vitamin D production – Vitamin D is an important nutrient that affects bone and immune health. UVB light stimulates skin cells to produce vitamin D, and natural or artificial sunlight is a primary source.
• Stimulate melanin production – Melanin is a pigment that helps protect your skin from sun damage and makes your skin darker. When someone tans, UV light has influenced the biological function of skin cells, prompting them to produce more melanin than usual.
• Break down bilirubin – Bilirubin is a molecule that accumulates when red blood cells are broken down. While most adults and children clear bilirubin naturally, newborns sometimes cannot. Hospitals use specific light‑based phototherapy to treat newborns with high bilirubin levels, helping them avoid severe effects such as permanent brain damage.

The proven effects of UV light on the body illustrate that light interacting with cells can reliably create biological changes.

Red Light vs. UV Light

While UV wavelengths and red or NIR wavelengths are both capable of affecting the body, there are important differences between these parts of the spectrum.

UV light is a high‑energy form of light with short wavelengths, while red light is lower energy with longer wavelengths. The shorter wavelengths of UV light make it difficult for this light to penetrate deeply into body tissues, and most of the known biological effects of UV are confined to the skin.

Conversely, because of its longer wavelength, red and near‑infrared light can penetrate deeper into tissue beneath the skin, influencing cells that are less visible and often more critical than skin cells alone. These deeper effects may be one reason the impact of red light took longer to recognize compared with UV.

How Does Red Light Therapy Work?

Because red light therapy is a newer modality, research into its mechanisms is ongoing. The leading hypothesis is that red wavelengths of light interact with mitochondria, tiny cellular organelles found in almost all cells. Mitochondria are central to managing inflammation, producing energy, and promoting cell regeneration—three areas red light therapy appears to influence.

Red Light Therapy and the Brain

One of the less studied but potentially most impactful applications of red light therapy involves its neurological benefits. Research into using red and near‑infrared light for brain health is very new, but emerging studies have shown promising early results that may change how this therapy is used in the future.

Recent Research

A recent review conducted by researchers from the United States, South Africa, Iran, and Germany and published in October 2021 examined multiple studies on photobiomodulation (light therapy) using red and NIR light for brain health. Published in the Journal of Alzheimer’s Disease, the review analyzed nine research papers and concluded that red light therapy shows promising neurological effects.

The international group of researchers grouped neurological conditions where red light therapy showed potential into three broad categories:

• Traumatic events – including stroke and traumatic brain injury.
• Degenerative diseases – such as dementia, Alzheimer’s disease, and Parkinson’s disease.
• Neuropsychiatric disorders – including major depression, bipolar disorder, anxiety, and post‑traumatic stress disorder (PTSD).

The authors write that “brain PBM therapy is safe, simple, pain‑free, inexpensive, easy to administer, and well‑tolerated by the patients in almost all clinical studies.” They also note that red and NIR light can penetrate the skull: “It is well known that photons in this wavelength range are able to penetrate the scalp/skull and partially reach the brain tissue.”

They conclude, “We expect PBM to continue to be investigated to treat diverse brain disorders, considering the evidence of efficacy, almost complete lack of adverse effects, and the availability of relatively inexpensive LED devices that can be used at home.”

Other Research

In addition to the Journal of Alzheimer’s Disease review, other studies have reported complementary findings. Research conducted at the VA Boston Healthcare System in 2015, for example, found increased blood flow in the brain and stimulation of mitochondria with red light therapy, spurring interest in treating veterans with war‑related brain injuries.

Another pilot study published in the Journal of Neurotrauma in 2014 examined red light therapy in people with mild, chronic traumatic brain injury and reported quantifiable improvements over the course of treatment.

Considerations for Neurological Treatment

While the potential uses of red light therapy for brain health are exciting, this field is still in its early stages. More research is needed to clarify optimal dosing, treatment schedules, device designs, and long‑term outcomes.

One of the most important implications is that red light therapy offers a non‑invasive, generally well‑tolerated approach to supporting neurological health. If future studies continue to be positive, this modality could give patients and clinicians a valuable adjunct to traditional therapies.

For neurological applications, it is especially important to use devices that can deliver sufficient power at appropriate wavelengths to reach target tissues. Helmet‑style systems and high‑output panels may be better suited for this than very small or extremely low‑power consumer products.

Theodore Henderson, MD, PhD, president of The Synaptic Space and owner of Neuro‑Luminance Corporation, has emphasized in a published perspective that effective tissue penetration is a vital consideration for the future of red and NIR light in brain health.

Mito Red Light Inc. is a leader in red light therapy and red light therapy for home products. Mito Red offers a variety of devices designed for high‑quality, dependable red and near‑infrared light delivery. We welcome you to review our selection of high‑quality red light therapy devices or contact one of our expert representatives at +1 866‑861‑6486 to learn more.

Frequently Asked Questions

Can red light therapy actually reach the brain through the skull?

Yes, studies suggest that certain red and near‑infrared wavelengths can penetrate the scalp and skull enough for a fraction of the light to reach superficial brain tissue, especially when higher‑power LEDs or lasers and appropriate wavelengths are used. The dose that arrives is small but appears sufficient to influence mitochondrial activity and blood flow in targeted regions in early trials.

What neurological conditions are being studied with red light therapy?

Research has explored red and near‑infrared light for traumatic brain injury, stroke, Alzheimer’s disease, Parkinson’s disease, dementia, and neuropsychiatric conditions such as depression, anxiety, bipolar disorder, and PTSD. Most of these studies are early‑stage and involve small samples, but many report meaningful improvements in symptoms or imaging markers that justify larger follow‑up trials.

How might red light therapy help the brain at a cellular level?

The leading hypothesis is that red and near‑infrared light interact with mitochondrial chromophores (such as cytochrome c oxidase), increasing ATP production and modulating reactive oxygen species and nitric oxide. These changes can influence inflammation, cerebral blood flow, neuroprotection, and neuroplasticity, which may help explain benefits seen in stroke, TBI, and certain neurodegenerative and mood disorders.

Is red light therapy for the brain safe?

Across published human studies to date, brain‑directed photobiomodulation has generally been reported as safe, non‑invasive, and well tolerated, with very few significant adverse events. That said, dosing, device quality, and protocol design matter, and people with serious neurological or psychiatric conditions should only pursue this therapy under professional guidance and as a complement—not a replacement—for standard care.

What kind of device should I consider if I’m interested in brain‑focused red light therapy?

For neurological applications, you want a device that delivers appropriate red and near‑infrared wavelengths with enough power density to reach tissue under the scalp. Helmet‑style systems and high‑output panels, such as those offered by Mito Red Light, are better suited for this than very small or ultra‑low‑power gadgets, though optimal parameters are still being refined in ongoing research.