Anyone who does not recover for months after a coronavirus infection eventually comes across red light therapy for long COVID. Often after trying many other things already. You deserve an honest answer, even if it is uncomfortable: research into photobiomodulation for long COVID is still in its infancy. There is no evidence that red or near-infrared light cures or resolves long COVID. Anyone who promises you otherwise should be treated with suspicion. What can be said with confidence is explained below.

What do we really know about red light therapy for long COVID?

Research into red light therapy for long COVID consists mainly of small studies, pilot studies, and case reports, usually without a proper control group. There is no evidence that photobiomodulation cures long COVID. The mechanism is biologically plausible, and participants sometimes report less fatigue, but that is not the same as demonstrated efficacy.

We sell panels, so you are right to be critical of what we write. That is precisely why we want to state this clearly: anyone who tells you that a lamp will eliminate your symptoms is selling you hope instead of information. That is the most harmful thing a provider in this field can do.

The line of reasoning: fatigue and mitochondria

Still, it is no coincidence that people searching for terms such as photobiomodulation long COVID and long COVID LED end up here. There is a line of reasoning that deserves to be taken seriously.

Persistent fatigue after an infection has been linked in research to impaired mitochondrial function. Mitochondria are the cell's power plants: they produce ATP, the fuel that virtually every process runs on. In some people with post-COVID fatigue, there are indications that this system works less efficiently, resulting in reduced exercise tolerance.

Photobiomodulation acts on that system. The electron transport chain contains cytochrome c oxidase, an enzyme that is sensitive to red light around 660 nanometers and near-infrared light from 830 to 850 nanometers. When exposed to light, nitric oxide is released, ATP production accelerates, and brief bursts of reactive oxygen are generated that act as repair signals. Read more on our pillar page about how red and near-infrared light work.

The reasoning is therefore: if the symptoms are linked to impaired energy metabolism, and LED therapy acts on that system, then light could help. And that is exactly where the problem begins.

Plausible is not the same as proven

Medical history is full of plausible mechanisms that produced nothing in practice. A mechanism tells you that something could work. A clinical study tells you whether it makes a difference, and how much. That second part is largely missing here:

• Small pilot studies, often without a placebo group or blinding.
• Highly divergent protocols in terms of wavelength, dose, and treatment duration, making the results barely comparable.
• Outcome measures based on questionnaires, which are sensitive to expectations and the fluctuating course of long COVID.
• No long-term follow-up, so there is no insight into what remains after six months.

In addition, long COVID is not a single disease profile. The same label encompasses people with shortness of breath, people with cognitive symptoms, and people who become exhausted after the slightest exertion. Different mechanisms are probably involved. What helps one group may have the opposite effect on another.

You can find the broader research base behind photobiomodulation, which is more established for skin, pain, and tissue repair, on our page about scientific research into red light therapy. Strong evidence for one application says nothing about another.

Post-exertional malaise: the most important warning

If you take away one thing from this article, let it be this. Many people with long COVID experience post-exertional malaise: a worsening of symptoms that occurs only hours to days after exertion and can last for weeks. That delay makes it insidious: you feel nothing during the session, and two days later you are completely incapacitated.

A light session is not nothing for the body. You remain standing or sitting still, you become warm, and an additional stimulus is introduced. With limited tolerance, that may already be enough to exceed your limit. The usual advice of ten to fifteen minutes does not apply here.

Therefore, consult your treating physician or a post-COVID physiotherapist before you begin. They know your tolerance and can help determine whether this fits within the gradual build-up schedule you are already following. Red light therapy does not replace medical treatment or supervised rehabilitation.

Starting red light therapy cautiously with long COVID

If you and your healthcare provider decide to try it, start at a lower level and build up more slowly than with any other application. The schedule below is a framework, not a prescription.

A few rules that go with this:

• Never increase two things at once: either the duration, the frequency, or the distance.
• Wait at least two weeks after each increase so that a delayed reaction can become apparent.
• Keep a log: date, duration, distance, and how you felt during the following two days.
• If your symptoms increase, stop. Do not reduce it—stop. Then consult your healthcare provider before starting again at a lower level.
• If you genuinely notice nothing after eight to twelve weeks, it probably adds nothing for you.

The sleep approach and the recovery approach

More realistic than hoping for a cure is to focus on two symptoms that often accompany long COVID and for which the evidence is somewhat stronger.

The first is sleep. Many people with post-COVID fatigue sleep poorly, and poor nights make all other symptoms worse. Unlike blue light, red light does not suppress melatonin production, so a short evening session should in principle be possible without disrupting sleep onset. You can read about how this relates to your internal clock in the article about red light therapy and sleep. Here too, the studies are small and the effects modest.

The second is local recovery. Muscle complaints and stiffness are common after a prolonged illness. The research base is strongest for pain and tissue recovery: macrophages shift into a reparative mode and microcirculation improves. This is described in the articles about red light therapy for pain and inflammation and red light therapy for muscle recovery. Those articles assume normal physical tolerance. For you, the lower dosages in the table above apply.

Both approaches are more modest than what you were looking for. They are also more honest: better sleep and less stiffness are not small things when your days have been narrow for months.

What to look for when evaluating claims

The long COVID market attracts providers with little to lose. Warning signs to step away:

• Claims are made about healing, recovery within a few weeks, or "switching off" inflammation.
• Success stories are shown without any reference to research.
• It is recommended to reduce medication or rehabilitation for light therapy.
• The device does not state a measured irradiance, only the wattages of the LEDs.

That last point is technically relevant. For clinically relevant effects, a minimum of approximately 100 mW/cm² at the treatment site is generally considered necessary. Cheap devices reach 20 to 30 mW/cm². Panacea panels measure a calibrated 130 to 200 mW/cm² at 15 cm. That says something about the device, but nothing about whether light works for long COVID.

Which device is suitable for this purpose

If you try it, you want to receive enough light from a generous distance without making the session too long. A large panel such as the ATP Pro 1500 makes that possible: you remain at 30 cm, reach a large part of the body at once, and keep the session short. Sitting rather than standing is preferable here. Protective eyewear is included, though closing your eyes is also fine.

Unsure? Feel free to schedule a free fifteen-minute video call with a specialist. No sales pitch: with long COVID, “wait a little longer and consult your doctor first” is an outcome we regularly recommend. A member of our team also always reads the comments below this article: ask a question in the comments, and a colleague will reply within 24 hours.

Frequently asked questions

Does red light therapy help with long COVID?

That has not been demonstrated. The research consists of small studies and pilot studies, often without a control group. There is no evidence that red light therapy cures or eliminates long COVID. The mechanism is plausible, and some users report less fatigue, but that is not demonstrated efficacy.

Why, then, is photobiomodulation mentioned in connection with long COVID?

Because persistent fatigue has been linked in research to impaired mitochondrial function, and photobiomodulation acts on that same system via cytochrome c oxidase. This rationale explains why it is being studied, but it does not prove that it makes a difference for patients.

I have post-exertional malaise. Can I safely try this?

Only after consulting your doctor or a post-COVID physiotherapist. A session is a stimulus and may be too much when your capacity is limited, with a setback that may not occur until days later. Start extremely low—three to five minutes at 30 cm—and stop if your symptoms worsen.

How long does it take before I might notice something?

Red light does not work as a painkiller; its effects build over time. With normal exercise tolerance, effects may appear after four to six weeks. With long COVID, progress is slower, so allow eight to twelve weeks before evaluating it. If you notice nothing by then, it probably is not adding anything.

Can I use this to replace my rehabilitation or medication?

No. Red light therapy does not replace a doctor, medication, or supervised rehabilitation. Never reduce or stop anything because you are starting light therapy. Anyone who advises you to do so is acting irresponsibly. At most, consider this something to use alongside your treatment, and discuss it with your healthcare provider beforehand.

Would you like to talk it through first? View the ATP Pro 1500 or get in touch. We’re happy to think it through with you, even if the conclusion is that this isn’t the right option for you at this time.