After exploring the most well-known laser caps for hair growth, it’s to narrow it down to the 3 of the best-selling ones in 2025.
In this post, we’ll review and compare the 3 best-selling (FDA-cleared) laser caps – HairMax PowerFlex, Illumiflow, and Kiierr – to help you make the best long-term decision for regrowing your hair.
Laser caps for hair growth are getting increasingly popular among people suffering from hair loss, thinning hair, and baldness.
Why?
Because they are proven to work, both by clinical studies and by people using them.
But:
Though laser caps are much more affordable than Low-Level Laser clinic treatments, the best ones are still quite expensive.
Here’s a short summary of our findings – we highly recommend to keep reading the specifics below.
This post contains affiliate links at no extra cost to you.
Overview
Key Takeaways
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Top Laser Caps Compared – The HairMax PowerFlex, Illumiflow, and Kiierr laser caps all use the same FDA-cleared LLLT technology with 272 laser diodes, but they differ in price, features, and user satisfaction.
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HairMax Offers the Fastest Treatment – With just 7 minutes of use three times a week, HairMax provides the shortest treatment time, making it the most convenient option.
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Best Value & Customer Ratings – Kiierr and Illumiflow offer lower prices and longer warranties than HairMax, with Kiierr having the highest user satisfaction and review scores.
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Return Policy & Warranty Differences – Illumiflow has the longest risk-free trial (12 months), while both Kiierr and Illumiflow offer a 2-year warranty (extendable for Kiierr). HairMax has a shorter 6-month trial with a restocking fee.
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HairMax Has the Most Experience – As the pioneer in at-home laser hair regrowth, HairMax has been in the market for over 20 years, with multiple FDA clearances and clinical trials backing its effectiveness.
Kiierr vs. Illumiflow vs. HairMax Laser Caps
All 3 brands use the same technology and have the same number of lasers and laser output, but it seems like Kiierr Laser Cap has the highest user satisfaction and buyer rating.
The HairMax PowerFlex is the most expensive laser cap, and it costs $1499, while the Illumiflow and the Kiierr cost about half this price.
However, the HairMax is the most flexible cap of the three and offers 2 modes of lasers – constant, and pulsating.
The most extensive warranty is offered by Illumiflow and Kiierr (2 years).
HairMax has the lowest consumer average rating (3.85 out of 4, compared to 4.4 for Illumiflow and Kiierr).
How Do Laser Caps Work?
Laser caps use low-level laser therapy (LLLT) to stimulate hair growth. The lasers penetrate the scalp to stimulate blood flow, which helps to promote hair growth (studies).
The lasers also help to reduce inflammation in the scalp, which can be a cause of hair loss.
Laser caps can help improve hair density, thickness, and strength by extending the anagen (growth) phase and promoting hair follicle function.
Laser caps are a safe and effective hair loss treatment option that can be used at home consistently for several months.
Technology Comparison
All three brands use real laser diodes (not LEDs) inside their laser caps.
The light must be administered at a specific wavelength and consistent power levels to stimulate the hair follicles and start regrowth.
HairMax, Illumiflow, and Kiierr laser caps all have 272 laser diodes evenly spread around the cap and covered with comfortable silicone.
👉 Scalp coverage – all 3 laser caps are designed for full scalp coverage, reaching almost all the scalp’s back and sides.
All three laser caps work with rechargeable lithium batteries. Kiieer’s battery is stronger than the Illumiflow (5000mAh – lasts for 5-7 sessions per charge). Hairmax’s battery lasts for 3 sessions per charge.
- Technology winner: HairMax Powerflex
Power Output (Irradiance) Comparison
The strength of each laser cap is determined by the power output (measured) in mW (milliwatts) and the number of laser diodes.
All 3 brands have 272 lasers, emitting red light therapy at 650 nm (the best wavelength for hair growth) at 5 mW.
This means that the total power output of all 3 laser caps is 1360 Mw.
- Strength winner: All 3 (tie)
Treatment Time
Do you know what is the most important factor in laser caps’ successful results?
Consistency.
Through clinical studies (HairMax has done 7 clinical trials so far), it takes 1-3 months to stop hair loss and hair thinning, and 1-3 more months to regrow new, healthy hair.
So, how do you stay consistent?
When you follow the regimen religiously.
This gets easier when the treatment time is minimal and the laser cap is 100% portable, so you can use it while you work or move around.
So, how do the HairMax, Kiierr, and Illumiflow compare when it comes to the LLLT hair treatment time?
- Treatment time winner – HairMax PowerFlex (only 7 minutes – 3 times a week)
Price, Return Policy, and Warranty
Since laser caps are a big investment, and it sometimes takes up to 6 months to regrow thicker and denser hair, the option to return the laser cap for a full refund (in case it doesn’t work) is very important.
Warranty for the parts and lasers is also important, and the company you buy from must be reliable and confident about their product.
The more confident they are, the longer the risk-free trial will be, right?
Well, here’s how HairMax, Kiierr, and Illumiflow compare:
HairMax has a 6-month money-back guarantee, but you’ll have to pay a 25% restocking fee if you decide to return it.
The warranty is for a year.
Kiierr – 7-month money-back guarantee, but you’ll have to prove no results with before and after pictures.
The warranty is for 2 years, and it can be extended to 4 years for an extra fee.
Illumiflow – 12 months no-questions-asked money-back guarantee, with a 2-year warranty.
- Trial period winner – Illumiflow
- Warranty winner – Illumiflow & Kiierr
Safety & FDA Approval
When it comes to laser caps, FDA clearance is essential.
The laser output must be accurate and balanced to promote hair growth safely. All 3 brands compared here are FDA-cleared for men and women.
FDA clearance means that the FDA has determined that the laser caps are substantially equivalent and safe to another similarly marketed device.
Experience and Time on the Market
When it comes to laser hair growth, the most experienced company is HairMax, which is celebrating its 20th anniversary and is the pioneer of at-home laser hair regrowth (and sells laser combs as well)
HairMax claims to be the undisputed global leader in the field, with 8 FDA clearances, 7 clinical trials, 14 international medical licenses, and more than 1.8 million laser devices sold in 170 countries since 2000.
Illumiflow applied for FDA clearance in July 2016, after 7 years of research, and has been selling their 2 models of laser caps (148 lasers/272 lasers) since February 2017.
Kiierr is the newest player and was granted FDA clearance in September 2018.
- Time on Market Winner – HairMax
Where is HairMax Made?
HairMax laser caps are manufactured by Lexington International LLC in Taiwan and assembled in South Florida. The headquarters are located in Boca Raton, Florida.
Consumer Reviews
We analyzed hundreds of buyer testimonials and reviews on all stores selling these laser caps, including official sites and Amazon. Here are the results:
HairMax consumer reviews – 34 reviews – 3.85 average rating
Illumiflow consumer reviews – 97 reviews – 4.4 average rating
Kiierr consumer reviews – 301 reviews – 4.6 average rating
Common consumer complaints:
- HairMax – Needs recharging after 1-2 treatments (to avoid a heavy battery pack)
- Illumiflow – Some users reported the lasers stopped working or were not able to recharge after a year, but the 5-year warranty solves this.
- Kiierr – no negative reviews, but a few users claimed that it wasn’t a miracle cure for them.
Conclusion
After many hours of research, we conclude that all 3 laser caps have pros and cons, and it’s up to each buyer to choose the right one according to what’s most important for you. See the short comparison video below to help you decide:
To your health and happiness,
Meital
Studies
Jimenez JJ, Wikramanayake TC, Bergfeld W, et al. .. Efficacy and safety of a low-level laser device in the treatment of male and female pattern hair loss: a multicenter, randomized, sham device-controlled, double-blind study. Am J Clin Dermatol. 2014; 15: 115–127
Suchonwanit, P., Chalermroj, N. & Khunkhet, S. Low-level laser therapy for the treatment of androgenetic alopecia in Thai men and women: a 24-week, randomized, double-blind, sham device-controlled trial. Lasers Med Sci 34, 1107–1114 (2019).
Egger A, Resnik S, R, Aickara D, Maranda E, Kaiser M, Wikramanayake T, C, Jimenez J, J: Examining the Safety and Efficacy of Low-Level Laser Therapy for Male and Female Pattern Hair Loss: A Review of the Literature. Skin Appendage Disord 2020;6:259-267.
Zarei, Mina & Wikramanayake, Tongyu & Falto-Aizpurua, Leyre & Schachner, Lawrence & Jimenez, Joaquin. (2015). Low-level laser therapy and hair regrowth: an evidence-based review. Lasers in Medical Science. 31. 10.1007/s10103-015-1818-2.
I really hope the dates on the Consumer Review pictures of the Kiier Laser Cap aren’t correct. If they are, then when the customer started on 3-09-19 he had considerably more hair than he did five months later on 8-03-19. The assumption would be the dates should either be 8-03-18 and 3-09-19 (seven months total) or 8-03-19 and 3-09-20 (seven months total). Not trying to be critical; simply thought it was a humorous mistake. :-)
Thank you for the comparisons, Meital. They were helpful.
Replying to my own comment . . . just realized Kiierr didn’t receive FDA approval until September of 2019, so the dates would have to be 8-03-19 and 3-09-20. Also apologize for not typing the two r’s in Kiierr the first time.
the dates are correct–dd-mm-yy :) this is the way the rest of the world (outside USA) sets the date.
Great review Meital. Keep it up! Thank you for your valuable info.