Kiierr Laser Cap Review 2025: Is It the Best Value for Hair Regrowth?

Hair loss is a common concern affecting millions worldwide, prompting many to seek effective, non-invasive solutions. Among the myriad of options available, the Kiierr Laser Cap has emerged as a popular choice. 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 features, efficacy and value.

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.

Kiierr Laser Cap: How Does It Rate?

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.

Quick Facts & Features

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].

How Does Kiierr Laser Cap Work?

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

The Kiierr Laser Cap utilizes Low-Level Laser Therapy (LLLT), a non-invasive treatment that employs red light wavelengths to stimulate hair follicles, promoting hair growth and slowing hair loss. Clinical studies have demonstrated the efficacy of LLLT in treating androgenetic alopecia in both men and women.

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].

One standout study published in Lasers in Surgery and Medicine showed that patients using low-level laser therapy (LLLT) saw a 35% increase in hair density after 16 weeks. Kiierr has delivered life-changing hair transformations, trusted by thousands and backed by real-world results—including praise from dermatology professionals like Amy McKinley, PA-C, who says, “I’m really impressed by the results.” These outcomes reflect Kiierr’s mission to restore confidence and hair health through scientifically supported technology.

Highlighted Products:

A. 148 Laser Diodes

The Kiierr 148 Laser Diode cap uses PureLaser™ technology with 148 medical-grade laser diodes to deliver precise Low-Level Laser Therapy (LLLT) at 650 nm. This FDA-cleared device stimulates hair follicles, improves blood flow, and supports natural hair regrowth. Designed for easy use, it requires 30 minutes every other day, with visible results typically in 4 to 7 months. Ideal for those seeking an effective, gentle hair restoration solution.

Uses:

• Simulates hair follicles
• Boosts scalp circulation
• Helps hair grow naturally

Best For:

• Early to moderate hair thinning
• Individuals preferring less intensive treatment
• Users who can commit to 30-minute sessions every other day
• Those on a moderate budget seeking effective hair therapy

Price: $799

B. 272 Laser Diodes

The Kiierr 272 Laser Diode cap features 272 high-quality medical-grade laser diodes, doubling the power output of the 148 model for more intensive scalp stimulation. Utilizing FDA-cleared PureLaser™ technology, it delivers 1,360 mW power at 650 nm wavelength to promote faster, fuller hair regrowth. Recommended usage is 30 minutes every other day, making it a powerful choice for moderate hair thinning.

Uses:

• Stimulates hair follicles at a deeper level
• Boosts nutrient delivery to the scalp
• Enhances blood flow to revitalize hair growth

Best For:

• Moderate to advanced hair thinning
• Users wanting stronger laser therapy
• Those comfortable with 30-minute sessions every other day
• Individuals seeking quicker hair regrowth results

Price: $1,199

C. 302 Laser Diodes

The Kiierr 302 Laser Diode cap offers the most advanced LLLT treatment with 302 medical-grade diodes delivering 1,510 mW power. Its FDA-cleared PureLaser™ technology provides intense stimulation of hair follicles at 650 nm, maximizing blood flow and nutrient absorption. Unlike other models, it requires only 6 minutes of daily use, offering a faster, highly effective hair restoration experience for those with significant thinning.

Uses:

• Stimulates inactive hair follicles
• Restores the scalp
• Speeds up hair regrowth

Best For:

• Severe hair thinning or bald spots
• Users seeking the fastest treatment times
• Those preferring daily short sessions
• Individuals ready to invest in top-tier hair therapy

Price: $1,399

Alongside LLLT helmets and hats, our Kiierr Restore Hair Growth Comb review explores comb‑style alternatives.

Kiierr Laser Cap: How to Use?

• Wear the cap for 30 minute treatments every other day.
• Ensure direct contact with the scalp.
• Use the included scalp primer serum for optimal results (optional).

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.

What to Expect:

• Weeks 1–4: Minimal visible change.
• Weeks 5–12: Reduced shedding, new baby hairs appear.
• Months 3–6: Noticeable thickening in thinning areas.
• Months 6+: Significant regrowth with consistent use.

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. These lasers emit light at an ideal wavelength for stimulating hair growth, providing results that are both safe and effective.

Quick Comparison Table

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…

Conclusion

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.