272 DIODES
312 DIODES
302 DIODES
HAIR & SKIN
SKINCARE ESSENTIAL
PATENTED TECH
5 MODELS
Every cap is backed by our 7-Month Growth Guarantee — see real regrowth, or your money back
7-Month Growth Guarantee — regrowth, or your money back
FDA-cleared laser therapy for women
Fall back in love with your hair.
The widening part. The thinning ponytail. The handful in the shower drain. You've noticed and you don't have to accept it. The Kiierr Laser Cap gently reawakens your follicles with the same light therapy hair doctors use.
Start Your Regrowth →
How the science works
Drug-free
No side effects
Doctor recommended
93%
of users saw visible regrowth in clinical testing
saw visible regrowth in clinical testing
4.4 · Excellent on Trustpilot
4.4 · Trustpilot
Trusted by 50,000+ women
As featured on TODAY
Recommended by hair restoration doctors
0% financing available
Half of all women experience hair loss. Almost none of us talk about it.
Hair is tied to how we feel about ourselves so losing it can feel like losing a piece of who you are. Whatever brought you here, your reason is valid. And in nearly every case, the follicles aren't gone. They're dormant, waiting to be woken up.
Menopause & perimenopause
As estrogen falls, hair exits its growth phase earlier thinning shows first at the crown and part line.
Postpartum shedding
The hormone drop after pregnancy can send handfuls of hair into shedding at once, often months 3–6.
Genetics
Female pattern hair loss runs in families each cycle, strands grow back a little finer.
Stress & life changes
Big stress can shock follicles into resting mode, causing sudden, diffuse thinning all over.
Thyroid & medical causes
Thyroid shifts, low iron, and some
medications quietly starve follicles of what they need.
Tight styles & heat
Years of tension and heat can wear on follicles along the hairline, temples, and edges.
Here's what all six have in common: dormant follicles, not dead ones. Laser therapy works at the follicle level so it helps no matter which story is yours.
See exactly how ↓
Why women choose light over drugs
It's called Low-Level Laser Therapy (LLLT) — the same technology hair clinics charge $3,000+ a year for. It's painless, completely cool to the touch, and works quietly while you go about your day.
1
272 medical-grade lasers bathe your scalp in red light
Light at 650 and 808 nanometers — the two wavelengths proven to reach every layer of the follicle. You feel nothing. No heat, no UV, no discomfort.
2
Your follicle cells absorb the light and re-energize
The light stimulates mitochondria inside each follicle, boosting cellular energy (ATP) and drawing fresh blood flow more oxygen and nutrients to the root.
3
Dormant follicles shift back into growth mode
Re-energized follicles re-enter the growth phase. Shedding slows first, then new strands arrive finer at first, then thicker and stronger with each cycle.
6
MIN
That's your entire routine. Wear it everyday while you read, sip coffee, answer emails, or watch your show. It's hands-free, portable, and fits discreetly under any hat.
Real regrowth follows your hair's natural rhythm
Anything promising overnight results isn't being honest with you. Here's the timeline most women actually experience:
Months 1–2
Shedding slows
Less hair in your brush and drain your follicles are holding on longer.
Months 3–4
Baby hairs appear
Fine new growth along your part and hairline as follicles wake up.
Months 5–7
Visibly fuller hair
A narrower part, a fuller ponytail results other people notice.
Minoxidil and prescription pills can help but they come with trade-offs many women aren't told about upfront. Light therapy strengthens the follicle itself, without touching your body's chemistry.
Side effects
The routine
Safe for colored & styled hair
Cost over 3 years
Kiierr Laser Cap
✓
None known
6 min, hands-free, daily
One-time purchase
Minoxidil
—
Scalp irritation, unwanted facialhair
Messy foam or liquid, twice a
day, forever
Can interfere with styling
$1,000+ in refills
Prescription pills
Hormonal side effects
A pill every day, forever
Ongoing prescriptions + visits
6 minutes, hands-free, daily
Safe for colored, treated & textured hair
Scalp irritation, unwanted facial hair
Messy foam, twice a day, forever
$1,000+ in refills over 3 years
Already using minoxidil? Laser therapy is safe to combine many doctors recommend using both together.
The easiest thing on your to-do list
No appointments, no mess, no remembering a twice-a-day routine. Put the cap on, press one button, and take 6 minutes that are already yours.
With your morning coffee
Portable & lightweight — start your day while it works.
During your wind-down
An episode of your show is almost exactly one session.
Even out on a walk
It fits discreetly under any hat no one has to know.
The therapy doctors use in clinics now on your couch
FDA-Cleared
"Low-level laser therapy is one of the few hair loss treatments I can recommend to women without worrying about side effects. It's safe, it's proven, and it treats the follicle itself."
— Dr Debra Shelby, Dermatologist
FDA-cleared as safe & effective for female pattern hair loss
93% saw regrowth in clinical testing
Same LLLT technology as $3,000+/year clinic programs
No heat, no UV — gentle on color- treated & textured hair
Real women. Real regrowth.
Unretouched before-and-afters from Kiierr customers moms, professionals, women in their 30s through their 60s.
"This cap gave me my confidence back. I can finally wear my hair down again without checking every mirror I pass."
Sarah J. · Verified buyer
"After menopause I thought thinning was just my new normal. Four months in, my part line is filling back in."
Marina G. · Verified buyer
"I wear it while I answer emails. Easiest thing I've ever done for myself and it actually worked."
Alison B. · Verified buyer
I'm Ready for My Results →
7
Month Growth Guarantee
If your hair doesn't grow, you don't pay. It's that simple.
We give you the full 7 months real regrowth takes. Use your cap 6 minutes every day and if you don't see visible results, send it back for a refund. One of the most generous guarantees in the industry, because we've seen it work 50,000+ times.
1 · Get your cap
2 · Use it 7 months
3 · Grow or get refunded
Questions women ask us most
Is it safe? Are there really no side effects?
Yes. Kiierr laser caps use low-level laser therapy (LLLT), a technology that's FDA-cleared for treating hereditary hair loss. Unlike medications, LLLT works with light energy (not chemicals) so it doesn't enter your bloodstream or interact with your body systemically. The lasers are "cold" lasers, meaning they don't produce heat that could burn or damage your scalp. In clinical studies of LLLT, no serious side effects have been reported. A small number of users notice mild, temporary scalp tingling or itchiness in the first few weeks, which typically resolves on its own. If you're pregnant, nursing, or have a scalp condition, we recommend checking with your doctor first — not because of known risks, but as a general precaution.
Will it work for my type of hair loss?
Kiierr laser caps are designed to help both men and women experiencing hair thinning or loss caused by common conditions such as androgenetic alopecia (male or female pattern baldness), postpartum hair loss, menopause-related thinning, stress-induced shedding, or general hair weakening with age. The caps use low-level laser therapy (LLLT), a safe, non-invasive technology that stimulates hair follicles, increases blood flow, and supports stronger, thicker hair growth over time. It works best for those who still have active follicles, meaning some existing hair is present. While results vary from person to person, most users who stay consistent with their treatment see visible improvement in hair fullness and scalp health.
Does it work on colored, treated, or textured hair?
Yes , laser therapy targets your hair follicles beneath the scalp, not the hair strands themselves. That means coloring, bleaching, relaxing, keratin treatments, and heat styling don't interfere with results. It's equally effective across all hair textures, from straight to coily. The one thing to keep in mind: for best results, use the cap on a clean, dry, product-free scalp so the light can reach your follicles without a barrier. Heavy oils, thick stylers, wigs, or weaves worn during your session can block light absorption, so time your treatments accordingly.
Can I use it alongside minoxidil or supplements?
Absolutely and many of our customers do. Laser therapy, minoxidil, and hair health supplements work through different mechanisms, so they complement rather than conflict with each other. In fact, many dermatologists recommend a combination approach for the best results. Just make sure your scalp is dry before your laser session; apply minoxidil after treatment rather than before, since a wet or product-coated scalp can reduce light penetration. As always, if you're on prescription medications, your doctor can confirm the right routine for you.
What if it doesn't work for me?
Consistency is key with low-level laser therapy. Make sure to follow the recommended treatment schedule and continue using your cap regularly for at least 7 months. Because hair growth happens gradually, it can help to take photos every month to track your progress. If you’ve used your cap consistently and haven’t noticed results after the full treatment period, reach out to our support team. You can read our full policy here.
Imagine your hair, seven months from now.
A fuller part. A thicker ponytail. Getting ready without dreading the mirror. 50,000+ women started exactly where you are and with the guarantee, you can't lose.
Shop the Women's Laser Cap →
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