Stem Cell 2-Step Thickening System – Act+Acre

NEW: Stem Cell Thickening Foam™ 25% off Sitewide • Offer applied in cart We Ship to US & Canada Free Shipping $75+

Close Icon
Close Icon

Your cart is empty.

Cold Processed®

Stem Cell 2-Step Thickening System

4.7
Rated 4.7 out of 5 stars
753 Reviews

Clinically proven two-step scalp system. The 2-Step Thickening System for fuller-looking hair, from root to end.

The Stem Cell Scalp Serum™ fortifies the follicle environment to lessen the first signs of visible shedding. The Stem Cell Thickening Foam™ styles and lifts, waking up inactive-looking follicles and delivering instant lift from the first application.

The Results:
+ 56% less visible hair fall-out in 12 weeks with Stem Cell Scalp Serum. 85.7% saw more scalp coverage.**
+ 94% noticed more volume + lift at the root from first application.*
+ Trichologist-formulated, Cold Processed® below 40°C
+ Vegan, no rinse, leave-on — both products

Valued at: $138

Stem Cell Thickening Foam™ | Full Size | 4 oz
Stem Cell Scalp Serum™ | Full Size | 2.2 oz

One time purchase not eligible for discounts.

Save 30% on Your First Subscription
(All following orders save 20%)
Pay using HSA/FSA with flex Select Flex at checkout to pay for your HSA/FSA eligible items
Why You Need This
thickening
strengthening
volumizing
Real User Results
Before/After of hair growth when using Stem Cell Scalp Serum
Before/After of hair growth when using Stem Cell Scalp Serum
Before/After of hair growth when using Stem Cell Scalp Serum

Save with sets

A bottle of Act+A. Stem Cell Thickening Foam with a white pump dispenser and a frosted clear bottle showing a pale yellow-green liquid, set against a clean gray gradient background.
Stem Cell Thickening Foam™
Volume Now. Density Later.
Learn More
Three bottles of Act+Acre plant-based stem cell hair care products on a gray background with a 'save $32' label.
Thick + Full Hair System
Promotes thicker + fuller feeling hair
Learn More
How to use Act+Acre Stem Cell 2-Step Thickening System:

Stem Cell Scalp Serum™:
On clean, damp, or dry hair, apply 1–2 pipettes along the hairline and part. Massage into the scalp. Do not rinse.

Stem Cell Thickening Foam™:
Shake well to activate bi-phase formula. Apply 2–4 pumps to damp scalp and roots. Distribute evenly throughout hair. Leave in. Air-dry for soft lift or blow-dry for added fullness.
post-wash
as needed

Save with sets

A bottle of Act+A. Stem Cell Thickening Foam with a white pump dispenser and a frosted clear bottle showing a pale yellow-green liquid, set against a clean gray gradient background.
Stem Cell Thickening Foam™
Volume Now. Density Later.
Learn More
Three bottles of Act+Acre plant-based stem cell hair care products on a gray background with a 'save $32' label.
Thick + Full Hair System
Promotes thicker + fuller feeling hair
Learn More
4.7
Rated 4.7 out of 5 stars
Based on 753 reviews
94%would recommend these products
Slide 1 selected
753 reviews
  • PN
    Paulina N.
    Verified Reviewer
    Reviewing
    Stem Cell Thickening Foam™
    I recommend this product
    Rated 5 out of 5 stars
    3 days ago
    Truly works

    I have had amazing results with the Stem Cell Thickening Foam. My hair has more volume and feels and looks thicker. The foam is weightless and not sticky at all. I have also noticed that my waves are more defined. Love this product!

  • AC
    Annie C.
    Verified Reviewer
    Reviewing
    Stem Cell Thickening Foam™
    I recommend this product
    Rated 5 out of 5 stars
    4 days ago
    So impressed

    I've never really used a foam before because I don't like how styling products make my hair feel, but this one is undetectable! My hair is still soft and touchable but with so much more body. I've been learning how to style my natural waves and this helps keep the shape SO well. I've also noticed so many more baby hairs since using this! Definitely one I'll be restocking

  • S
    Saskia
    Verified Reviewer
    Reviewing
    Stem Cell Thickening Foam™
    I recommend this product
    Rated 5 out of 5 stars
    4 days ago
    Fuller looking hair

    This made my thinning hair look fuller while I waited for the shedding to stop and my hair to grow back. It gave my hair more volume and helped me feel more confident while I was waiting for new growth.

  • NB
    Nicole B.
    Verified Reviewer
    Reviewing
    Stem Cell Thickening Foam™
    I recommend this product
    Rated 5 out of 5 stars
    4 days ago
    Great addition to my hair care lineup

    This easily incorporated into my existing routine. It’s never sticky or crunchy. I had such nice results, I’m buying one for my mom - I can hardly wait to share this with her!

  • ME
    Moriah E.
    Verified Reviewer
    Reviewing
    Stem Cell Thickening Foam™
    I recommend this product
    Rated 5 out of 5 stars
    4 days ago
    Amazing lasting volume!

    Loved this! The foam gave my hair such amazing volume. It also really helped give my waves both definition and volume. I have a sensitive scalp but my scalp felt way more balanced using this. Great new product!