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Kiierr Laser Cap Review: Is This A Powerful LED Light Hair Growth Device?

Kiierr Laser Cap is a red light therapy hair growth cap available in either 148 or 270 diodes for thicker, longer, healthier hair over time.

RedlightTherapyDigest StaffBy RLTD Staff Updated November 2, 2023
Medically reviewedMedically reviewed by: Purvisha Patel MD, FAAD
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Editor's Rating


Kiierr Laser Cap

Kiierr Laser Cap Review: Is This A Powerful LED Light Hair Growth Device?

What is Kiierr Laser Cap?

When it comes to red light therapy hair growth products the Kiierr Laser Cap is one of our favorites, for its power and efficacy as well as for the fun, not to mention lightweight and portable design.

The Kiierr Laser Cap is available in both 148 or 272 diode models, and you can also get it bundled with some of their other hair growth products – the shampoo, conditioner, and hair growth vitamins.

Kiierr Laser Cap results in added growth and thickness, decreased shedding and loss, and enhanced overall hair health and appearance. In this review we’ll give you all of the key details about Kiierr Laser Cap, and tell you what we honestly think of its efficacy and value.

Kiierr Laser Cap: How Does It Rate?

Editor’s Rating

Kiierr Laser Cap

Kiierr Laser Cap
User Friendly4.5/5User Friendly
Customer Satisfaction4.3/5Customer Satisfaction


  • Kiierr Hair Laser Cap can promote hair growth.
  • This device can enhance the thickness and volume of the hair.
  • Kiierr Laser Cap can prevent shedding and breakage.
  • The product can enrich overall hair health.
  • Kiierr Laser Cap can promote hair radiance.


  • The results, including length of time for growth, will vary for different users.
  • Some users may not like the cap-like style of the device.
  • High demand leads to low stock at times.



*All individuals are unique. Your results can and will vary.

About the Brand

The manufacturer is a company called Kiierr, which has its headquarters in Tooele, Utah. Founded in 2008 by husband and wife Mike and Jolene Anderson, they focus exclusive on producing and selling red light therapy caps for promoting hair growth and health.

Their passion comes from experience with medical conditions and hair loss, and the high quality of the products reflect this.

Expert Opinion on Kiierr Laser Cap

Laser surgeon Dr. Raymond Lanzafame from Rochester, New York discussed the efficacy of red light therapy for hair loss:

The short story for readers is yes, it [red light therapy] can be helpful. Active or passive, the light has to get to your scalp. You do have to keep doing it, you do want to make sure that the devices have a [FDA] clearance [1].

A review of the research published in the Journal of Cutaneous and Aesthetic Surgery by Jisha K Pillai and Venkataram Mysore found support for the safety and efficacy of low level light therapy for promoting hair growth [2].

Quick Facts & Features

Rating: Safety and Quality Safe & Quality
Brand Kiierr
Product Kiierr 148 Pro Laser Cap
Kiierr 272 Premium Laser Cap
148 and 272 Complete Systems with Hair Growth Products (Shampoo, Conditioner, Vitamins)
Form Laser Hair Growth Devices
Saftey FDA Cleared
Age Adults only
Skin Type All types
Benefit Promotes hair growth and volume, slows shedding and breakage, enhances hair health, promotes radiance, repairs damage, decreases inflammation
Price $749-$1049 (Caps)
Shipping FREE 2-Day Shipping
Return Policy 7 Month Return Policy; 2 Year Warranty
Purchase Walmart.com

How Does Kiierr Laser Cap Work and What Are the Health Benefits?

The cap uses red light therapy, which works by sending photons into the scalp to the follicles. The stimulation of the hair follicles activates hemoglobin to improve circulation.

Greater blood flow brings oxygen and nutrients to the follicles and scalp for enhanced growth. This also promotes the proliferation of follicles for thicker hair. In addition, red light therapy delays the transition of the hair cycle from anagen to catagen, so the growth period is longer.

A randomized controlled trial published in Lasers in Surgery and Medicine by Raymond J Lanzafame, et al on men with androgenetic alopecia concluded that low level laser therapy at 655nm over 16 weeks (2x daily) increased hair count [3].

The device uses red light at 650 nm exclusively, because much of the research has identified this as the ideal wavelength for hair growth.

A study published in the Annals of Dermatology by Kai Yang, et al examined the effects of 650nm light on a hair follicle culture and concluded that it improved hair growth [4].

As we explained in our article red light therapy and its impact on collagen, red light therapy stimulates the release of added collagen, which strengths the hair and follicles and promotes growth.

A review article published in Dermatology by Khosrow Siamak Houschyar, et al discussed molecular mechanisms of hair growth and regeneration [6].

The Evidence Score

Here is our evaluation, based on scientific research, of the potential effectiveness of Kiierr Laser Cap for its claimed benefits.

  • Promotes Hair Growth *4.6/5
  • Prevents Hair Loss and Shedding*4.4/5
  • Enhances Overall Hair Health*4.5/5
  • Increase Hair Thickness and Volume*4.3/5
  • Improves Hair Radiance *4.2/5

Kiierr Laser Cap: How to Use?

The manufacturer recommends 30 minute treatments every other day for optimal hair growth. Charge the device with the USB charger provided before use. For detailed instructions as to how to use the cap, see the accompanying user’s manual.

Side Effects and Risks

Research studies show the safety of red light therapy products in general and for hair growth specifically. The Kiierr Laser Cap is an FDA-cleared device made following strict safety guidelines, and there are no related risks or side effects.

Quick Comparison Table

Name Kiierr Laser Cap illumiFlow 272 Laser Cap iGrow Laser Hair Growth Helmet SuperGro Laser Hair Growth 272 Diode
Rating Rating Rating Rating Rating
Price $749-$1049 $799 $499.99 $429.99
LEDs 148, 272 272 Not stated on offical site 272
Benefits Hair growth, health, thickness, repair Hair growth, health, thickness, repair Hair growth, health, thickness, repair Hair growth, health, thickness, repair
Treatment Time 30 minutes every other day 30 minutes 3 times a week 20 minutes per session 15 minutes 3x week
Safety FDA Cleared FDA Cleared FDA Cleared FDA Cleared


Q: Where Can You Buy It?

A: You can buy the 180 Pro Laser Cap or the Kiierr 272 Premier Laser Cap from a few online retailers, and it’s for sale at Walmart stores and online.

In our opinion, however, the best place to purchase is on the manufacturer’s official website. They offer deals, including bundling with some of their haircare products. They also offer free 2-day shipping. The Kiierr Laser Cap price list is as follows:

  • 148 Pro Laser Cap – $749
  • Kiierr 272 Premium Laser Cap – $999
  • 148 Complete Systems with Hair Products (Shampoo, Conditioner, Vitamins) – $799
  • 272 Complete Systems with Hair Products (Shampoo, Conditioner, Vitamins) – $1049

Q: What is the Return Policy?

A: The manufacturer offers a very generous 7 month growth guarantee. If you do not experience results after 7 months, let the company know and send back the order for a full refund. The return process is easy and hassle free, and they have a great customer service team.

Q: Does Kiierr Laser Cap Work?

A: Although naturally growth takes time and full results usually occur in about 6 months, the caps certainly work. With 148 and 272 diodes these are powerful devices, and there are quite a few studies supporting the efficacy of red light therapy for successful hair growth and health.

Q: What Sets It Apart From the Competition?

A: There are other high powered LED caps for hair growth on the market, but this device is high quality, made by a reputable manufacturer, and fairly reasonably priced.

What is the Customer Feedback?

We favor the Kiierr Laser Cap as a leading producer of red light for hair, and based on our read-through of the Kiierr Hair Laser Cap reviews most of the customers agreed with us.

For example, out of the over 1400 customer reviews on the official site, users rated it 4.6 out of 5 stars. In addition, 558 Walmart customers gave Kiierr Laser Cap 4.5 out of 5 stars, and Google reviewers rated it 4.1 stars.

One of the best 5 star review on Google comes from Frederick S, who experienced great hair growth results:

My experience with your cap was and first of all, it works. The person who takes care of my hair remarked that after a few months it showed significant hair growth. I have long hair that has been growing for many years. After using the cap it has gotten longer and fuller than it ever has been. It works as simple as that.

My hair line was receding and stopped growing back. My bald spot on top has all but gone away. I am a 72 year young man and have many people in my family that are now bald. Thank you again for your hair cap therapy.

While there are few Kiierr Laser Cap complaints, some do exist. One of the top critical reviews is from Dan B, who had trouble with the sizing of the cap:

Cap is too small for my head. I have a normal size head and have never had any issues with hats or even a different laser cap I tried in the past…


In summary, Kiierr Laser Cap is a leading producer of red light for hair growth, with a baseball cap design and either 148 or 272 diodes. Besides offering powerful hair growth, thickness, radiance, and general health benefits, the Kiierr Laser Cap manufacturer is very well-regarded in the market.

While opinions always vary, we find that the vast majority of the Kiierr Laser Cap reviews are from happy customers who are pleased with their hair growth benefits, as well as enhanced thickness, health, and body. Most users say it’s more than worth the cost, and we would agree.

This model is an FDA cleared device manufactured according to rigid safety standards, and there are no associated risks or Kiierr Laser Cap side effects. If you’re looking for a safe, reliable at-home solution to hair growth, we highly recommend Kiierr Laser Cap.

If you want to use light therapy to remove hair rather than grow it, read through our article on the best laser hair removal at home.

By Purvisha Patel MD, FAAD

Purvisha Patel is a board certified dermatologist, MOHS and cosmetic surgeon, and the founder/owner of Advanced Dermatology and Skin Cancer Associates in Memphis, Tennessee.

**This is a subjective assessment based on the strength of the available information and our estimation of efficacy.

*Result may vary. The information contained in this website is provided for general informational purposes only. No medical claims are implied in this content, and the information herein is not intended be used for self diagnosis or self treatment of any condition.

Disclosure of Material connection: Some of the links in the post above are "associate sales links." This means if you click on the link and purchase an item, we will receive commission. Regardless, we only recommend products or services which we use personally and/or believe will add value to our readers. We are disclosing this in accordance with the Federal Trade Commission's 16 CFR, Part 255: "Guides Concerning the Use of Endorsements and Testimonials."

Average Customer Rating:4.0 / 5.0 
1 Customer Reviews

Rating Snapshot:

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    Alina Perez June 10, 2023

    Best product for hair growth

    I strongly recommend anyone experiencing hair loss or thinning hair get the Kiierr Laser Cap. Because of its practical cap shape, which enables hands-free treatment, it is simple to include in everyday routines and see noticeable changes in hair density.


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