HERLAYRA · Founding Tester Panel

Test a water-light scalp serum — and tell us the truth.

We're inviting a small group of US testers to try our water-light, leave-on scalp serum for about four weeks — real ingredients, named in full, no miracle claims — and share an honest review, good or not.

Cosmetic scalp care — not a hair-growth treatment

Targeted scalp care for stronger-looking, fuller-looking hair.

Apply to test →

Free Core routine · about 4 weeks · one honest review

Scalp-first care — part, massage, leave on.

For people who have tried enough

Tried enough heavy oils, sticky serums, and bigger promises?

Then the next thing you try shouldn't ask for blind faith. It should show you the part you can judge on day one — how it feels on your scalp, how easy it is to repeat, and exactly what's in the bottle.

HERLAYRA starts there: a water-light scalp step, a clear benefit, and the full ingredient list before you ever commit.

What makes it different

Feels like water, not oil. And it names everything.

A water-light mist you spray straight onto the scalp, then leave on. Here's what you'll actually be testing:

Water-light, not greasy

No heavy oil, no sticky residue by noon. It's the part you can feel on day one.

Names everything

Named cosmetic actives — Procapil, Baicapil & Redensyl — with the complete ingredient list on every pack. Research them yourself.

Simple enough to keep

Part, mist, massage — about a minute. A routine works because it fits real life, not because it's complicated.

Cosmetic scalp care — not a hair-growth treatment

Why we made it

Your scalp is skin — so we treat it like skin.

Most hair care stops at the strands. We start one layer up, at the scalp — with a water-light routine that's calm, simple, and honest about what it is.

Born in Vietnam — the credential, not a sales story. Heritage explains our point of view; it isn't evidence.

— LA VAN THANG, FOUNDER

No miracle claims. Just a water-light routine for healthier-looking hair, starting at the scalp.

How the tester program works

Three steps. About four weeks.

Apply below. We review applications and pick testers with a US address.

We ship you the Core routine, free. Use it for about four weeks as part of your normal wash routine — part, mist the scalp, massage.

Around week four, leave an honest review on our site — whatever you genuinely think. You'll just note that we sent it to you for free.

The routine in motion — part, mist, massage. About a minute.

A fair, transparent deal

What you get. What we ask.

You get

Our full Core routine, free — 2 full-size serums + a wash-day duo
A 60-second how-to
A thank-you if you share a photo or short clip

We ask

Real use for about 4 weeks
One honest review — positive or negative
A quick note that it was sent to you free

What's in your free Core routine

Your free Core routine: two full-size scalp serums, a mini shampoo and a mini conditioner

2 full-size serums + a mini shampoo & conditioner (45 ml). Enough for your full four-week test.

Bottle labels may vary as we update our packaging.

We never ask for a positive review, a five-star rating, or a script. Your honest opinion is the entire point.

Who we're looking for

Honest testers in the US.

You're in the United States — that's where we can ship.
You wash your hair regularly and want to take care of your scalp.
You'll give us your honest take — that's the whole point.