The Science
The label is the pitch.
No secret blends. No borrowed lab coats. Here's every active in the routine, what each one is for, and exactly what we can — and can't — honestly claim about it. Read it, then decide for yourself.
Start with the molecule most brands skip
What PDO is — and why it's on our label.
PDO (pyrrolidinyl diaminopyrimidine oxide) is a lab-made cosmetic active with a long track record in professional skin and scalp care.
Most scalp products in this category are built around a single oil — a little rosemary, a little biotin, and a big story. RootStim is built the other way around: PDO anchors a full active stack, and the other four actives support it. It's the one active our closest alternatives — the rosemary-oil bottles and the supplement subscriptions — don't carry.
That's not a claim about what it does inside your body. It's a fact about what's in the bottle, published where you can read it.
The active stack
Five actives, each with a named job. Here's what each is for — in cosmetic terms, because that's honestly what they are.
PDO
A lab-made active from professional aesthetics. In our formula it's the anchor of the scalp-conditioning system — the ingredient the other four actives are built around.
Saw Palmetto
A long-standing scalp-care ingredient. We include it at a meaningful level, not a token drop for the label.
Caffeine
A well-studied cosmetic scalp ingredient — part of keeping the formula working at the roots, where clean, conditioned-looking hair starts.
Biotin
Best known for supporting the look and feel of fuller, healthier-looking strands.
Rosemary Oil
The scalp-care oil most people already know from this category. It's the fifth active on the shampoo label — named in full, not the whole story on its own.
Step 2 — Conditioner actives (Rosemary · Keratin · Argan · Jojoba)
The step-two actives that smooth, condition, and improve the feel of fragile, fine strands — so they look fuller and break less with regular use.
Every active is on the label and in the full ingredient list below. Sulfate-, paraben- and phthalate-free.
Real customers, real routines
4.8 stars across 300+ real routines.
No paid clinical studies. No invented percentages. Just real customers on real 90-day routines, sharing honest, unfiltered reviews and photos. Scroll the wall, read the reviews, and decide for yourself.
As our 90-day photo program ramps up (see the Guarantee page), verified customer photos — submitted with permission — appear here first.
Photos: real customers, shared in exchange for a review discount — disclosed here because that's what honest looks like.
Individual results vary and are not typical. These are unretouched customer photos shared with permission — a personal experience, not a promised or average result.
Full transparency
Why our label carries safety notes — and what they mean.
Transparency has to include the uncomfortable parts. Two notes on our label deserve a plain-English explanation:
Keep away from pets
Our formulas contain active ingredients that can be harmful to pets — especially cats. Store and use them away from animals, and rinse hands thoroughly.
About PDO
PDO is a lab-made cosmetic active, not a plant extract — which is exactly why we print it on the label in full and call it a professional-grade ingredient instead of dressing it up.
We'd rather you read this here than be surprised by the bottle. Hiding it would undercut the one thing this whole page is about.