Growth Brush SerumLoved by 10,000+ customers — before and after resultsGrowth Brush SerumGrowth Brush SerumFor all hair types — before and after hair regrowthSTERK vs others hair serum comparisonGrowth Brush SerumScalp-loving ingredientsWoman holding STERK GrowTurn hair brush serum
★★★★★ 13,374+ reviews
KOREA'S No.1 · AMAZON'S CHOICE

Growth Brush Serum

  • Visible regrowth in 14 days
  • Stops shedding instantly
  • Fills bald spots · thickens hair · no greasy residue
  • 97% saw new growth in 30 days
Anti-hair-loss exosome serum with a built-in brush — less shedding, thicker-looking, fuller hair.
Only 15 left in stock
Proven results
100% Natural & Vegan
60-Day Guarantee
Lisa and 120,000+ others purchased
WARNING: Low Stock Notice
This product sold out 11 times last year. We encourage you to take advantage of the Summer Sale and buy now.
Straight answers

Frequently asked

How fast is shipping?

Every order ships the next business day, with tracked delivery. Free US shipping on orders over $50.

Is there a results guarantee?

You're covered by a 60-day money-back guarantee. If your shedding isn't calmer, contact us within 60 days for a full refund — keep the bottle.

What are the key ingredients?

BioExo-Water™ (exosome) and heartleaf lead the formula — signalling a healthy scalp environment and calming irritation. We also add biotin & ginger extract to help strengthen strands and support thicker, fuller-looking hair with less shedding, plus collagen & bakuchiol to support a healthy scalp and resilient-feeling hair. menthol for freshness cooling sensation

Will it work on my hair type?

Yes — it's made for all hair types: straight, wavy, curly and coily. The lightweight, fast-absorbing serum works on the scalp without grease or buildup, on thin or thick hair, and you can brush it into wet or dry hair as part of your daily routine.

How to use ?
How long does it take to see results?

Most people notice less shedding in the shower within the first 1–3 weeks — usually the first sign it's working. Baby hairs and visible regrowth along the hairline and crown typically start showing between weeks 4 and 8, and density and thickness become more noticeable around the 2–3 month mark with daily use.

FROM PEOPLE WHO WERE LOSING MORE THAN HAIR

Real People, Real Results

★★★★★
Finally, A Trend Worth Trying
“I was skeptical of TikTok trends, but this one actually works. Way less hair in my brush after just a few weeks, and the built-in applicator makes it effortless.”
Lauren, 28
★★★★★
Saved Hundreds, Got Same Results
“I've spent hundreds on hair serums and this one is just as good as the expensive clinic stuff. My part line looks noticeably fuller already.”
Michelle, 45
★★★★★
Slow Progress, But Real Results
“All my volume disappeared after my pregnancy. This brought it back. It took a couple of months, but my ponytail finally feels thick again.”
Sarah, 31
★★★★★
Non-Greasy Morning Routine Game-Changer
“Doesn't make my roots greasy! I can apply this in the morning before work and it actually gives my hair a bit of a volume boost.”
Amanda, 43
★★★★★
Mini Spa Treatment Every Night
“The best part is the built-in massager. It's like a mini spa treatment every night and my scalp has never felt this clean.”
Latisha, 35
★★★★★
Baby Hairs Are Finally Sprouting
“Finally seeing baby hairs along my hairline. It's not an overnight miracle, but the shedding stopped and new growth is really coming in.”
Victoria, 51

Visible Results in Weeks

Woman in kitchen holding STERK GrowTurn ampoule — visible results in weeks
WEEKS 1–2
Scalp Reset
  • Scalp starts feeling cleaner and less itchy
  • Cooling menthol soothes irritation right away
  • Follicles begin waking up from the caffeine boost
  • No big changes yet, but your scalp is getting ready
WEEKS 3–4
Less Shedding
  • Way less hair in the shower drain
  • Hairbrush stays cleaner each day
  • Roots feel stronger and more anchored
  • Most users notice the stop-loss by week 4
WEEKS 5–8
New Growth Begins
  • Tiny baby hairs start showing up along the hairline
  • Part line looks less wide and more filled in
  • Hair feels thicker and has more bounce
  • Friends and family start noticing the difference
WEEK 8+
Fuller, Healthier Hair
  • Visible regrowth in thinning spots
  • Ponytail feels thicker and heavier
  • Hair stays strong with daily use
  • Long-term scalp health keeps results going

The Results Speak for Themselves

When 94% of users felt their hair look and feel visibly thicker, you're not looking at another hair product — you're looking at a routine that finally works.
Model with fuller, thicker hair holding STERK GrowTurn ampoule
87%
Saw a significant decrease in hair shedding & thinning
92%
Noticed a reduction in flakiness & dandruff
94%
Saw a significant decrease in scalp buildup
98%
Felt an increase in hair health & density
*Based on a consumer perception study. Individual results vary.
Why a brush changes everything

Your serum never reached the part that matters.

Droppers and sprays coat your hair — but hair is dead. The follicle lives in your scalp, and that's where a serum has to land to do anything.

GrowTurn's soft silicone brush parts the hair and deposits the serum directly at the root, then massages it in — supporting circulation to the follicles as you go.

Right ingredient, right place. That's the whole difference.

Ingredients & Benefits

BioExo-Water™ (exosome tech). The hero — signals a healthy environment around the follicle to support thicker-looking hair.

Heartleaf (Houttuynia). A Korean skincare staple that soothes and calms an irritated, flaky scalp.

Biotin & ginger extract. Help strengthen strands and support thicker, fuller-looking hair with less shedding.

Collagen & bakuchiol. Support a healthy scalp and resilient, better-looking hair.

Fragrance-free · low-irritation · no-rinse · made for daily use.
How it works

Fuller-looking hair in 3 steps

1. Part & press. Glide the brush along your scalp where it's thinning — the bottle feeds serum straight to the bristles.

2. Brush it in. Massage in small circles for 20–30 seconds. Feel the scalp wake up.

3. Style as usual. No rinse, no residue. Once daily for best results.

30 seconds a day. No rinse. No mess.

Why everything else let you down

GROWTURN
DROPPER / SPRAY / PILLS
Reaches the scalp, not just the hair
Runs off the strands
Massages to support circulation
Mess-free, no drips
Drips down your face
30 seconds, daily-easy
Fiddly or slow
No pills, no prescription
Side effects / doctor visits
30-DAY MONEY-BACK GUARANTEE

Brush it in for 30 days, risk-free

Use GrowTurn daily for a month. If your shedding isn't calmer and your scalp doesn't feel healthier, contact us for a full refund — keep the bottle.

Many people notice less shedding within a few weeks

Give your follicles a fighting chance

Less shedding. Thicker-looking hair. 30 seconds a day, brushed right where it counts.

Get GrowTurn
Free US shipping over $35 · 30-day money-back guarantee

These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease. Individual results vary. For external use only.