Thick + Full Hair System – Act+Acre

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Cold Processed®

Thick + Full Hair System

4.7
Rated 4.7 out of 5 stars
1,135 Reviews

Clinically proven to support the appearance of fuller, denser hair by 46%. A complete cleanse-to-treat system for advanced hair thinning, powered by Capixyl™at the clinical level.

+ A lightweight, leave-in treatment for hair thinning — thicker, fuller-looking.
+ 86% noticed more hair coverage on scalp. 85.% noticed more volume.
+ Trichologist formulated, Cold Processed® below 40°C.


Includes:
+ Stem Cell Shampoo: Caffeine, Peppermint Oil and Hyaluronic Acid.
+ Stem Cell Conditioner: Meadowfoam Seed Oil, Hydrolyzed Rice Protein and Niacinamide.
+ Stem Cell Scalp Serum: Apple Stem Cell Complex and Bamboo Pea Sprout Blend

*Clinical study, n=30, 4 months, p<0.05. Capixyl™. Lucas Meyer / IFF. **12-week third-party clinical study (Complife), 28 subjects, acute telogen effluvium at baseline.

Valued at: $170

Save 30% on Your First Subscription
(All following orders save 20%)
Why You Need This
cleansing
strengthening
volumizing
Real User Results
Before/After of woman with long, blonde hair using Act+Acre Stem Cell Shampoo
Before/After of hair growth when using Act+Acre Stem Cell Scalp Serum
Before/After of hair growth when using Act+Acre Stem Cell Scalp Serum

Frequently Bought With

Act+ Acre Cold Processed Stem Cell Scalp Serum in a frosted glass bottle with a white dropper cap, shown on a dark-to-light gray gradient background with two award badges on the right: a blue Australian Psoriasis Foundation Recognized badge and an InStyle Readers' Choice Beauty Awards 2025 badge.
Stem Cell Scalp Serum™
Restorative, antioxidant-rich serum
Learn More
How to Use:

For Stem Cell Shampoo:
Apply to wet hair. Start cleansing at the nape of the neck and work upward for a deeper cleanse. Cleanse twice for optimal results.

For Stem Cell Conditioner:
After shampooing, apply from mid-lengths to ends. Rinse thoroughly. Leave in for 2-3 minutes for added nourishment.

For 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.
pre-wash, post-wash
daily

Frequently Bought With

Act+ Acre Cold Processed Stem Cell Scalp Serum in a frosted glass bottle with a white dropper cap, shown on a dark-to-light gray gradient background with two award badges on the right: a blue Australian Psoriasis Foundation Recognized badge and an InStyle Readers' Choice Beauty Awards 2025 badge.
Stem Cell Scalp Serum™
Restorative, antioxidant-rich serum
Learn More
4.7
Rated 4.7 out of 5 stars
Based on 1,135 reviews
95%would recommend these products
Slide 1 selected
1,135 reviews
  • SS
    Susan S.
    Verified Buyer
    Reviewing
    Stem Cell Scalp Serum™
    I recommend this product
    What is your main hair goal? I want to stop my hair thinning
    Do you experience hair loss? Severe or rapid hair thinning
    Do you experience any scalp concerns? Itchiness
    Rated 4 out of 5 stars
    2 days ago
    good stuff

    I think this has helped my shedding slow down--but I have trouble with the pipette as I have arthritis in my hands. I'm getting the 3% which might be easier to be consistent. It has helped calm down my scalp itchiness though some of that may have been the medicines I have had to take. My stylist has noticed more new growth though that is hard for me to feel. Most of my thinning is crown and sides in a semicircular pattern, from medical issues and stress. Looking forward to the new stuff.

  • LP
    Leeann P.
    Verified Buyer
    Reviewing
    Thick + Full Hair System
    I recommend this product
    What is your main hair goal? I want to grow longer ahir
    Do you experience hair loss? Moderate or gradual hair thinning
    Do you experience any scalp concerns? No scalp concerns
    Rated 5 out of 5 stars
    1 week ago
    Unbelievable so far

    My husband and I have been using this full system for a little over 3 weeks now, and we can both already see a difference in how much hair we are losing. We are committed to using this for at least 3 months to really give it fair chance.

  • CB
    Christian B.
    Verified Buyer
    Reviewing
    Plant Based Stem Cell Conditioner™
    I recommend this product
    What is your main hair goal? I want to stop my hair thinning
    Do you experience hair loss? Moderate or gradual hair thinning
    Do you experience any scalp concerns? No scalp concerns
    Rated 5 out of 5 stars
    2 weeks ago
    Fuller, thicker hair achieved

    In combination with the shampoo and the Stem Cell Serum, I have over the course of 9 weeks achieved both thicker feeling hair, and and fuller hair at the crown and frontal hairline where I was beginning to notice thinning. Consistency is key, as I had previously used the scalp serum but was not consistent in its use. I have now used it in conjunction with the shampoo and conditioner almost every day for 9 weeks, and the difference is noticeable.

  • CB
    Christian B.
    Verified Buyer
    Reviewing
    Stem Cell Scalp Serum™
    I recommend this product
    What is your main hair goal? I want to stop my hair thinning
    Do you experience hair loss? Moderate or gradual hair thinning
    Do you experience any scalp concerns? No scalp concerns
    Rated 5 out of 5 stars
    2 weeks ago
    Thicker, fuller hair achieved

    I'd previously tried Stem Cell Scalp Serum, but was not consistent in my use of it. This time I have been very consistent at applying it almost every day for approximately 9 weeks, and the difference is noticeable. My wife has even commented that an area that was thinning at the crown of my head and the mid-frontal point / Widow’s Peak is noticeably fuller. I can also feel that my normally fine hair feels thicker with more body. I use the entire Act + Acre system including the shampoo and conditioner.

  • YR
    Ysenia R.
    Verified Buyer
    Reviewing
    Thick + Full Hair System
    I recommend this product
    What is your main hair goal? I want to stop my hair thinning
    Do you experience hair loss? Moderate or gradual hair thinning
    Do you experience any scalp concerns? Itchiness
    Rated 5 out of 5 stars
    2 weeks ago
    WOW

    I have been using the shampoo and conditioner + serum for almost 6 weeks and I can see the difference in the shower and on the scalp. Less hair falling out and new growth is popping up! Hoping to continue to see the difference and can't wait to try other Act+ Acre products.