Proof, not promises.
Most grooming is guesswork in a handsome bottle. Hiro starts with the biology of how men actually lose hair and age, then formulates clinically documented actives at a dose that does something, in a numbered system you can actually measure over time.
01
Evidence
Every active is backed by published, peer-reviewed research. No ingredient gets in on a hunch.
02
Dosage
Formulated at the strength studies actually used, not the trace amount that just lets a label make a claim.
03
Consistency
A numbered system built to be run daily and judged on what you can actually measure.
Start with biology
Better results start with how men's bodies actually work
Men's skin is thicker, oilier and ages on a different curve. Men lose hair through a hormonal pathway women rarely face. Generic, unisex products ignore all of it. We start from those differences and formulate directly to them.
2x
More sebum production than women's skin, on average
DHT
The hormone behind most male pattern hair loss
Daily
A two-minute routine built for consistency
Clinical
Every active dosed at therapeutic, not marketing, strength
The shortlist
A short list of proven ingredients
We don't chase trends. Every active earns its place with published evidence and a mechanism we can explain in plain English.
Rosemary Oil
In a peer-reviewed trial it matched 2% minoxidil over six months of consistent use, with significantly less scalp irritation.
Squalane
A lightweight lipid that mirrors the skin's own oils, sealing in moisture and softening hair without grease or buildup.
Tallow
Grass-fed tallow is rich in the fatty acids and fat-soluble vitamins skin recognizes, deeply nourishing the barrier.
Vitamin C
A potent antioxidant that brightens tone and supports collagen, defending skin against daily environmental stress.
Ceramides
Lipid molecules that rebuild the skin barrier, locking in hydration and keeping irritation out.
Niacinamide
Vitamin B3 that strengthens the skin barrier, calms irritation and helps regulate excess oil on the scalp and face.
Delivery matters
An active only works if it reaches the follicle
Concentration on the label means nothing if it never gets where it needs to go. Our hair actives are built into a pre-wash format at therapeutic concentrations, engineered to sit on the scalp and absorb before they are rinsed away. The right molecule, at the right dose, in the right place.
How we formulate
Method over marketing
Four rules decide what goes into a Hiro formula and what stays out.
01
Clinical evidence first
If an ingredient cannot point to published, peer-reviewed research, it does not make the formula.
02
Therapeutic dosing
We dose actives at the strength studies actually used, not the trace amount that lets a label make a claim.
03
Synergistic stacking
Each formula is designed so the steps compound, targeting the same concern through different mechanisms.
04
Built to be measured
The protocol is built to be evaluated, not just felt. Run it consistently and judge it on what you can actually see.
Our standards
What we will, and won't, put in a bottle
Full transparency
Every active is on the label at a concentration we are willing to stand behind. No proprietary blends hiding a weak dose.
No junk ingredients
No parabens, sulfates, phthalates, synthetic fragrance or fillers added to pad the bottle.
Made in the USA
Formulated and filled in small batches under tight quality control, so what ships is what we designed.
Start the protocol. Measure the results.
Two minutes a day on a numbered system. Run it consistently and judge it on what you can actually see.
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The protocol, in three steps
Choose your protocol
Pick the system for your concern: hair, skin, scalp or the full routine.
Use it consistently
A simple numbered routine that takes about two minutes, morning or night.
Measure the difference
Track real change in the mirror, and lock in 15% with a subscription you can pause anytime.