Low-Level Laser Therapy: Does It Help With Hair Loss?

Read Time: 10 minutes

Level Laser Therapy & Hair Loss: My Experience

When I was diagnosed with male pattern hair loss, I immediately picked up some Rogaine and signed up for something called low-level laser therapy.

It was 2007, and at the time, many doctors were parading low-level laser therapy as a hair loss savior – a treatment that would not only stimulate hair regrowth, but also prevent future hair loss even after stopping the therapy. The cost for eight sessions? $2,000. Expensive, but given the hype, I had to try it.

After eight laser therapy sessions, what were my results?

I’ll save you the suspense: Rogaine + low-level laser therapy did not regrow my hair.

With that said, I can’t dismiss low-level laser therapy as an effective hair loss treatment. In fact, under the right circumstances, low-level laser therapy may be a very effective hair regrowth tool. This article uncovers why.

After reading, you will know:

  • How the same treatment (laser therapy) can achieve hair removal AND hair regrowth
  • FIVE ways low-level laser therapy encourages hair thickening and regrowth
  • The best way to find a hair loss-laser therapy product or provider and not blow thousands of dollars

What Is Low-Level Laser Therapy?


Low-level laser therapy (LLLT) is “therapeutic” exposure to red or near-infrared radiation.

For hair loss sufferers, this involves placing the scalp under infrared-emitting laser diodes. A typical laser therapy session lasts from 20-60 minutes. You can complete them at a doctor’s office, with a take-home laser helmet, or even with a laser brush.

While the treatment looks ridiculous, it helps to think about laser therapy in this context:

Laser diodes for hair loss emit red light at wavelengths of 630-670 nanometers. The sun emits wavelengths from from 250 to 2,500 nanometers.

Low-level laser therapy is simply exposure to one part of the sun’s spectrum for a controlled period of time. And it turns out that some wavelengths show serious benefits to human physiology – from wound healing to inflammation resolution to even hair recovery.

Low-Level Laser Therapy (LLLT) Benefits: Health & Hair

Scientists discovered laser technology in 1960. Soon after, researchers began testing its effects on health. What they found? While some wavelengths can blind you, other wavelengths can…

Then researchers discovered laser therapy’s effects on hair health. The results were promising and paradoxical…

On the one hand, laser therapy can permanently remove body hair. On the other, it can accelerate hair growth rates in mice and even increase hair follicle proliferation in humans. The question was… Why?

How can laser treatments both encourage faster hair growth or permanently remove hair? How can it accelerate wound healing or permanently blind us?

How Can Lasers Trigger Hair Growth And Hair Removal?

It all depends on a laser’s wavelength, pulse rate, session duration, and frequency of exposure.

For example: a laser operating at wavelengths of 630-670 nanometers can encourage hair follicle proliferation (hair regrowth). But at wavelengths of 690-1100 nanometers, a laser can overheat a hair shaft, damage soft tissues around a follicle, and destroy the hair. There’s a very fine balance between two opposing effects.

And while we know that low-level laser therapy (LLLT) helps stop or reverse hair loss or hair thinning, no one yet knows the optimal

  • …session duration (minutes of use)
  • …number of sessions per week
  • …infrared or near-red wavelength
  • …number of laser diodes to use per brush or helmet
  • …beam diameter

This is even well-acknowledged in the literature:

“Although LLLT is now used to treat a wide variety of ailments… a large number of parameters such as the wavelength, fluence, power density, pulse structure, and timing of the applied light must be chosen for each treatment. A less than optimal choice of parameters can result in reduced effectiveness of the treatment, or even a negative therapeutic outcome. As a result, many of the published results on LLLT include negative results simply because of an inappropriate choice of light source and dosage.”

This is why I don’t consider my results from low-level laser therapy (LLLT) to represent the treatment’s potential.

No, I didn’t regrow any hair while trying LLLT. No, my rate of hair thinning didn’t slow or stop. But remember: I tried LLLT in 2007 – ten years ago. Yes, I did it at a doctor’s office and under physician supervision. But maybe eight sessions wasn’t long enough. Maybe the specified wavelength wasn’t right. Maybe the diode diameter wasn’t wide enough. I’ll never know. But a lot can change in ten years – including LLLT’s best-practices for hair recovery…

Except here’s one thing that hasn’t:

We still don’t know exactly how low-level laser therapy regrows hair.

How Does Low Level Laser Treatment Encourage Hair Regrowth?

No one knows. But there are plenty of theories.

In fact, there are so many proposed mechanisms of how low-level laser therapy regrows hair that entire papers have been published just to summarize them. Here are five worth mentioning:

1. The laser’s heat activates heat shock proteins

Some of these heat shock proteins – specifically HSP27 – are utilized for cell proliferation and division. And in the scalp, increasing these proteins also increases follicular stem proliferation. In other words, it encourages hair regrowth.

2. The laser’s light increases tissue oxygenation

When the infrared light hits a tissue cell, that light separates nitric oxide from an enzyme called cytochrome c oxidase (CCO). When nitric oxide binds to the enzyme CCO, it displaces oxygen in the cell and decreases cellular respiration. LLLT dissociates nitric oxide from CCO and, in doing so, increases cellular respiration and tissue oxygenation.

Lower tissue oxygen levels are observed in balding regions of the scalp. Anything that improves scalp tissue oxygen levels should also encourage hair regrowth. (Note: for more information, read this).

Calcification Fibrosis Hair Loss

3. The laser’s light increases blood flow

Where there’s low oxygen, there’s low blood flow. This is because blood carries oxygen to the cells – so it’s no surprise balding regions have lower amounts of both.

This is where infrared light comes up. Just as infrared light dissociates nitric oxide from skin tissue cells, it also separates nitric oxide in the cells that make up our blood vessels. Nitric oxide behaves differently depending on where it is in the body. In the blood, nitric oxide actually encourages vasodilation (widening of vessels), and so here, more nitric oxide increases blood flow. In the capillary networks, LLLT’s separation of nitric oxide is a good thing, but for completely different reasons.

4. The laser’s light generates acute tissue inflammation

Because LLLT increases cellular respiration and tissue oxygenation, it also increases the activity of reactive oxygen species (ROS) in the scalp tissue. You might’ve heard of these reactive oxygen species (ROS) from anti-aging fanatics. Too many ROS can increase oxidative stress and thereby accelerate aging.

But in acute doses, ROS are actually necessary for cell proliferation, inflammatory responses, and even immune function. LLLT increases ROS to a therapeutic (read: not detrimental) level in scalp tissues. The ROS activate protective genes which encourage cell proliferation, along with specific growth factors associated with hair regrowth.


5. The laser’s light can inhibit 5-alpha reductase 

5-alpha reductase is the enzyme that converts free testosterone into tissue DHT (dihydrotestosterone). The more 5-alpha reductase, the more DHT collects in our scalps.

On the plus-side, the evidence for DHT’s role in hair loss is strong: 1) DHT is elevated in balding scalp tissues, 2) men who are castrated before puberty (and can’t produce much DHT) never go bald, and 3) men who lack the 5-alpha reductase enzyme don’t lose their hair later in life. This is why drugs like Finasteride and Dutasteride were made. They’re 5-alpha reductase inhibitors. They reduce the amount of DHT that collects in balding scalp tissues.

With that said, DHT’s role in pattern hair loss is still debated! We aren’t yet sure if elevated scalp tissue DHT is the cause of male pattern hair loss… Or rather a symptom of chronic inflammation.

But reducing scalp tissue DHT may help slow hair loss, stop it, or even recover a bit of hair. So if LLLT inhibits 5-alpha reductase might just be one (of many ways low-level laser therapy that means that anything that inhibits 5-alpha reductase in the scalp might also help halt hair loss.

This all sounds good. LLLT might be a viable hair recovery treatment. But before you go out and drop thousands of dollars on laser therapy, here’s what you need to know.

What You Need To Know Before Trying Low-Level Laser Therapy For Hair Loss

Problem #1: LLLT Products Vary In Hair Regrowth Efficacy

There are three different kinds of laser therapy treatments:

  1. Laser Combs. Hair combs with laser diodes built between the bristles. Use: any time, any place.
  2. Personal Laser Helmets. Take-home laser diode helmets. Use: probably just your home.
  3. In-Office Laser Helmets. In-house laser diode helmets. Use: only at a doctor’s office.

While these all use the same technology, I have significant reservations about laser combs.

The biggest problem is that there’s no easy way to track how long each part of your scalp has been exposed to the laser diode. Why? Because you’re combing your hair and moving the diodes the entire time. There’s no way to know if each part of your scalp is getting enough exposure for a theraputic effect.

The laser combs are also uncomfortable to use. And I’m speaking from personal experience. I bought a $300 laser comb back in 2009 and never liked using it. I feared damaging my eyes each time a laser diode flashed into my retina. After a few months (and no results), I put the comb in my closet and forgot about it.

So if you’re going to try laser therapy, I recommend that you should opt for a helmet over a comb. Doing so might cost more, but it’ll help you track scalp coverage and avoid eye injuries.

Problem #2: There Are No Laser Therapy-Hair Regrowth “Best Practices”

Of all the doctors that offer in-house laser treatments, none of them seem to agree on which settings are best for hair recovery.

I’m talking about session duration, session frequency, laser diode size, and wavelength (among others). Many doctors have different setups, and very few doctors share which settings work for their patients, and which settings don’t.

This makes it hard to find the “best” in-house LLLT provider.

How To Find A Laser Treatment With A Record Of Hair Regrowth

You can’t just walk into any doctor’s office offering LLLT and expect hair regrowth. There’s just too much variation in settings and a lack of information-sharing across in-office laser therapy providers.

So, you need to do your homework. Here are two ways to find a hair loss laser treatment that actually works:

1. Find a study on LLLT that achieved significant hair regrowth on humans (not mice)…

…Then buy the exact same laser. Replicate that study’s methodology on yourself – the session duration, session frequency, wavelength, and everything in between. Don’t be afraid to email authors of hair loss-laser therapy studies. They take forever to get back to you, but they do reply.

There are also a few laser therapy providers who do this work for you – building custom laser helmets based on study findings.

2. Find someone who achieved significant hair regrowth while trying low-level laser therapy

These people exist in real life and on hair loss forums. Track them down, and then make sure they’re not connected to any LLLT affiliate programs. If they have before-after photos, that’s even better. Then find out their exact routine – session duration, session frequency, helmet used, doctor visited, etc. Match their exact methodology and routine.

If you deviate from either option, you could find yourself in scammy territory. Low-level laser therapy products are thousands of dollars. You don’t want to make a purchase mistake with that much money on-the-line.

Final Thoughts On Low-Level Laser Therapy And Hair Regrowth

The evidence is clear: low-level laser therapy (LLLT) shows promise in slowing, stopping, or even reversing hair loss. With that said, researchers still haven’t uncovered…

  • LLLT’s exact mechanisms of action
  • The best wavelength, diode width, session duration, or session frequency for hair regrowth

Low-level laser therapy is also expensive, and if you’re going to spend thousands of dollars, do your homework so you avoid scammy laser products. Either 1) replicate the methodology of human hair regrowth-LLLT studies, or 2) track down someone who’s seen success with LLLT, and then replicate their methodology.

In order to advance low-level laser therapy and its effectiveness for hair recovery, LLLT providers should start sharing their “best practices” with physicians. Doing so will get us closer to uncovering the mechanisms and optimum settings for hair recovery.

One last note: I have no recommendations for, nor am I affiliated with, any LLLT products.



Stop Googling "How To Regrow Hair" Until 3AM

Instead, just sign up for my 10-day course on natural hair recovery.

Inside, you'll get access to my before-after photos, the science behind the DHT paradox, hair treatment mistakes to avoid, reader-submitted photos, and much more.

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Stop Googling "How To Regrow Hair" Until 3AM

Instead, just sign up for my 10-day course on natural hair recovery.

Inside, you'll get access to my before-after photos, the science behind the DHT paradox, hair treatment mistakes to avoid, reader-submitted photos, and more.

Powered by ConvertKit


  • Praz

    Reply Reply January 12, 2017

    Great article Rob.

    Interesting stuff , however ive also come across websites which sell the helment, and offer money back if the treatment does not work. I absolutly agree with result variations and lack of understanding of mechanisms at work. (Reading from user comments)

    However why spend thousands on LLLT , when you can spend that amount on a possible transplant ? which is more likely to produce results. Maybe a thousand dollars more depending on who its with.

    Could it be that LLLT breaks down scalp tissue calcification ? , does it attack Tissue DHT ?

    What seems more and more apparant with all these treatments , Dermaroller, LLLT, massage . Is that they somehow have an effect on blood supply and scalp environment. Looking at the theories of LLLT, its seems much more apparant that MPB is a blood related , calcium and oxygen related symptom.

    I recently read an article on Heart disease , and its connection with MPB. Linking it very strongly. (Japanese researchers )

    Could it be that our genetics determine > veins/arteries and blood supply > calcium deposits , which can block arteries leading to heart issues. And storage of calcium deposits in the scalp ?

    There was evidence in this particular article of hair regrowth, where people improved their heart health. Through diet , excersize and lifestlye.


    • Rob

      Reply Reply January 14, 2017

      Hey Praz,

      Good questions. LLLT is generally less expensive than a hair transplant. The difference is that a hair transplant is really just hair rearrangement – taking hairs from the back of the head and moving them to thinning areas. There’s no regrowth involved in a hair transplant and the density changes are purely cosmetic. Whereas LLLT’s mechanisms actually encourage hair thickening and hair regrowth. So choosing which treatment is better depends on your goals – cosmetic hair rearrangement versus actual hair regrowth. Couple that with the variability of hair transplant success and LLLT success, and you have an even harder decision to make!

      It’s possible that LLLT might help breakdown some fibrosis via its mechanisms that promote acute inflammation generation, increased tissue oxygenation, and improved blood flow. It’s impossible to say for sure since there aren’t any papers confirming it – but my guess is that it helps to a degree. Again, all likely depends on treatment settings (wavelength, pulse rate, etc.).

      I agree – pattern hair loss is so closely connected to lower tissue oxygen levels, low blood flow, inflammatory markers, etc. Those therapies all tend to help resolve these underlying (and causative) issues.

      It’s also completely possible that our genes or gene expression where we store soft tissue calcification. I talked about this a little in the comments section of this article. There’s still so much we don’t know!



  • Jack

    Reply Reply February 12, 2017

    Hi Rob.

    I purchased and read through your e-book and videos today. The arguments you make on root causes, the references, and treatments are compelling. My thinning is entirely in the front hairline, only started in the last two years (I’m over 55), and it is fortunately noticeable only to me (for now). I plan to use your method throughout 2017 to see if this reverses the thinning and will write back as my treatment progresses.

    In the meantime, on the subject of LLLT, I have used this over the last two years without success. After reading your ebook and watching the videos however, I was left wondering if I was using the laser comb correctly. I have concentrated the laser exclusively in the region of my hair thinning! By the same arguments for your DT treatment where the entire head is massaged (both in and outside of the hair thinning region)… I expect the laser treatment should also be applied to the entire head. Does this make sense to you? Do you think there would be an issue with using both LLLT and DT?

    Finally, I am impressed with your analytical reasoning, problem solving acumen, and clear communication style. If not too personal, I would be interested in learning about your bio and educational background. Great job on the book and video!

    Best regards,


    • Rob

      Reply Reply February 13, 2017

      Hi Jack,

      Thank you for your support to keep the site running. I’m looking forward to your progress this year! To answer your questions…

      1) It’s possible that LLLT is more effective if focused all over the scalp (both thinning and thick hair regions) versus thinning regions only. While the evidence isn’t yet there to say with 100% certainty, we know that 1) the healing of damaged tissues is influenced by the uninjured tissue which surrounds it; and 2) growth factors and wounding-healing proteins can migrate across damage sites. Both of these points are in favor of your theory.

      On a related note – many readers also use a dermaroller as part of their mechanical stimulation routines. The dermaroller users who are reporting the most success are the ones rolling their entire scalps (and not just thinning regions).

      I wish I could comment more about the mechanisms as to why. As new studies emerge, I’ll keep you updated. There’s still so much we don’t know.

      2) Based on the data, I think it’s fine to do LLLT with the massages. There are a few readers doing this currently, and none have reported recession / thinning which leads me to believe that LLLT’s most powerful regrowth mechanism probably has less to do with inflammation generation, and more to do with something else.

      3) I’ll email you more personal details of my bio. I don’t write much about it on this site, since I work a full-time job and try to keep the hair stuff and my real job separate.

      Please keep me posted with your progress! And if you have any more questions – I’m happy to help.


  • Jack

    Reply Reply February 14, 2017


    Thank you for your response.

    Regarding the subject of cellular inflammation, I have long followed the work of Dr. Barry Sears (Enter The Zone and The Inflammation Zone).. along with following the Zone diet (albeit, not perfectly). Cellular inflammation has been found to be the silent culprit behind a surprising number of diseases… including a malfunctioning thyroid. Therefore, it came as no surprise to me when you made the connection in your book to hair loss. Dr. Sears developed a blood test to measure one’s state of cellular inflammation. It’s called the AA/EPA ratio http://www.zonediet.com/shop/omega-3-fish-oil/cellular-inflammation/. His prescription to reducing this ratio to normal (disease free) levels is to follow a Zone like diet (close to what you disclosed in your book) along with a daily large dose of high quality (low contaminant) Omega 3 fish oil. My inflammation ratio is in a very good range.. about 3. Hence I don’t believe my diet requires further modification in addressing my frontal hair thinning problem.

    If you are familiar with his work, I’d be interested in your thoughts on the AA/EPA ratio as a means to determine one’s degree of cellular inflammation.. and if this would be a good way for someone to decide whether or not they need to modify their diet as part of their hair repair/regrowth program. If you are not familiar with it, I think you would find it well researched and compelling.

    Thanks again for all you do.

    Best regards,


    • Rob

      Reply Reply February 17, 2017

      Hey Jack,

      Thanks for sending this over. The concept between balancing your AA:EPA ratio is very similar to the balancing of an omega 6:3 ratio mentioned in the book (since arachidonic acid is from omega 6 and eicosapentaenoic acid is from omega 3). But Dr. Sears and I differ on opinions about supplementation. I think that eating a diet naturally low in omega 6 (via avoidance of vegetable oils, most nuts/seeds, and processed foods) and naturally high in omega 3 (via fish) is a more effective way to minimize cellular inflammation than by boosting the ratio with omega 3 supplementation.

      The evidence on omega 3 supplementation is hotly debated – with some studies suggesting that omega 3 reduces inflammation, and others suggesting that it in fact contributes to heart disease. I think the dividing point is in oxidation. EPA is highly susceptible to oxidation via heat and oxygen, and most leading fish oil supplements are (unfortunately) oxidized. The pathways and benefits of omega 3 differ greatly when we control for oxidation.

      Chris Kresser wrote a great summary article on the latest research. If you have a few minutes, it’s worth checking out:


      All my best,

  • Hercules

    Reply Reply March 24, 2017

    Haven’t read the entire article so sorry if you happened to mention it, but all LLLT studies I’ve read to date were funded by the companies that sell these products. Hence one should take their results with a grain of salt..

    • Rob

      Reply Reply March 24, 2017

      It’s a great point Hercules! And while it’s briefly covered in the article, it’s worth reinforcing in the comments: we absolutely need to weight any study’s findings with the potential bias of its authors. If those authors aren’t independent but rather hired directly by low level laser manufacturers, then there’s a higher potential for bias.

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