Full-Body Red Light Therapy and Long COVID: Can Photobiomodulation Help With Brain Fog and Neuroinflammation?

Millions of people recovering from COVID-19 are still waiting to feel like themselves again. The fatigue persists. The thinking feels slow. Words that used to come easily now take longer to find. For many Long COVID patients, this isn't a psychological issue or a lack of effort — it's a measurable biological phenomenon, and science is beginning to understand exactly what is driving it.

One of the most consistently documented mechanisms behind Long COVID neurological symptoms is chronic neuroinflammation: the persistent activation of the brain's microglial cells, which continue releasing pro-inflammatory cytokines — including IL-1β, IL-6, and TNF-α — long after the initial infection has resolved. The result is a brain operating under sustained biological stress: slowed neural transmission, compromised cerebral energy metabolism, and the characteristic cognitive opacity that patients describe as brain fog.

The search for non-pharmacological approaches that can address this mechanism directly has led researchers to an unexpected candidate: photobiomodulation (PBM) — clinically, the most well-researched form of red light therapy.

How Photobiomodulation Works at the Cellular Level

Photobiomodulation uses specific wavelengths of red and near-infrared light to stimulate mitochondrial function. The primary mechanism involves the activation of cytochrome c oxidase — a key enzyme in the cellular respiratory chain — which increases ATP production, reduces oxidative stress, and modulates downstream cellular signalling.

In the context of Long COVID neuroinflammation, this is particularly relevant for several reasons:

Reduction of pro-inflammatory cytokines. Multiple studies have demonstrated that PBM downregulates IL-6, TNF-α, and IL-1β — precisely the cytokines maintaining microglial cells in a state of chronic activation in Long COVID. Simultaneously, it can upregulate anti-inflammatory cytokines such as IL-10, helping restore immune balance.

Inhibition of neuroinflammatory pathways. Photobiomodulation interferes with molecular signals involved in neurotoxic microglial and astrocyte activation, including the NF-κB and JAK2-STAT3 pathways — directly implicated in post-COVID neuroinflammation persistence.

Improved cerebral blood flow and energy metabolism. PBM enhances cerebral circulation, synaptic efficiency, and overall brain energy metabolism — directly counteracting the slowed neural transmission characteristic of Long COVID cognitive symptoms.

The Evidence in Long COVID Patients

A landmark 2023 pilot study directly compared two photobiomodulation modalities in Long COVID patients presenting with brain fog: transcranial PBM (helmet device, 1070 nm) versus whole-body PBM (light bed, 660/850 nm). Both groups completed 12 sessions of 14 minutes each, three times per week.

The results were significant. Both groups showed measurable improvements in cognitive assessments evaluating working memory, executive function, mental flexibility, and reaction time. Crucially for whole-body photobiomodulation, the light bed group achieved results comparable to the direct transcranial treatment group — suggesting that systemic light delivery can meaningfully benefit brain symptoms through both peripheral anti-inflammatory effects and direct near-infrared penetration.

Additional supporting findings include:

• Documented reductions in systemic inflammatory markers including IL-6 and TNF-α in COVID-related contexts

• Improvements in fatigue, cognitive performance, and quality of life reported across case series and smaller trials using whole-body or combined PBM for Long COVID

• Broader preclinical and clinical data showing PBM reduces microglial activation and neuroinflammation in models of brain injury, neurodegeneration, and cytokine-driven inflammatory states

Why Full-Body Rather Than Localised Treatment?

Most studies on PBM and Long COVID have used localised devices — transcranial helmets or targeted panels applied to specific areas. However, Long COVID is a multi-system condition. It affects the brain, but also cardiovascular function, systemic energy metabolism, and immune regulation throughout the body.

Full-body photobiomodulation cabins — the medical-grade technology we use at AURORA — expose every cell in the body simultaneously to the most clinically studied wavelengths: 633nm, 660nm, 810nm, 850nm, and 940nm. This allows the treatment to address neuroinflammation not only through systemic effects on peripheral inflammation and vascular function, but also through the direct penetration of near-infrared wavelengths into deep tissues.

In a single 12-minute session, the entire organism receives treatment that no localised device can replicate. For a condition as multi-systemic as Long COVID, this distinction matters.

What the Science Says — and What It Doesn't

At AURORA we believe in scientific honesty. The evidence on photobiomodulation and Long COVID is promising but still early-stage. The most robust studies involve small sample sizes, and larger randomised controlled trials specifically examining whole-body delivery for neuroinflammation are limited.

What is established:

• The biological mechanism is coherent and well-supported across multiple research contexts

• The anti-inflammatory effects of PBM are extensively documented in other clinical settings

• The safety profile is excellent — non-invasive, no documented adverse effects, compatible with all existing treatments

• Patients who respond typically require consistency: multiple sessions per week over a minimum of 4 weeks

This is not a cure. Results vary between individuals. But for people seeking a non-pharmacological approach that directly targets the mitochondrial and inflammatory pathways implicated in Long COVID, full-body photobiomodulation represents one of the most scientifically grounded options currently available.

Experiencing Long COVID Symptoms in Barcelona?

AURORA offers medical-grade full-body photobiomodulation sessions in El Born, Barcelona — Spain's first and pioneering centre of this kind. If you are dealing with brain fog, persistent fatigue, or other post-COVID neurological symptoms, our team can guide you through a protocol tailored to your situation.

Your first session is a straightforward way to understand how your body responds.

No side effects. No pharmacological interactions. No commitment beyond trying.

Book your session at aurora.fitness or via @aurora.biomodulation

This article is intended for informational purposes only and does not constitute medical advice. If you are experiencing Long COVID symptoms, please consult a qualified healthcare professional.

Scientific References

1. Bowen R, Arany PR. Use of either transcranial or whole-body photobiomodulation treatments improves COVID-19 brain fog. Journal of Biophotonics, 2023. https://pubmed.ncbi.nlm.nih.gov/37018063/

2. Hamblin MR. Mechanisms and applications of the anti-inflammatory effects of photobiomodulation. AIMS Biophysics, 2017. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5523874/

3. Photobiomodulation for cognitive dysfunction (Brain Fog) in post-COVID-19 condition: a randomized double-blind sham-controlled pilot trial. eClinicalMedicine, The Lancet, 2026. https://www.thelancet.com/journals/eclinm/article/PIIS2589-5370(25)00665-0/fulltext