BioBrew Fermented Strengthening Serum
For weak or damaged hair
- Up to 3x less breakage in one use, lab-tested
- Heat protection up to 450°F
- Frizz control for up to 72 hours in 80% humidity
Densifying Serum For Thinning Hair
- Free shipping $90+
- Ships in 2 business days
- 60-day returns
Our clinically proven scalp serum reduces signs of shedding, hair fallout + thinning at the scalp for thicker, fuller-looking hair in as few as 90 days, based on an expert grading evaluation on 34 panelists after use of the Densify Shampoo, Conditioner and Serum.
Free from:
- No added water
- No silicones
- No sulfates
- No parabens
- No phthalates
- No mineral oil
What it does
- Reduces hair fallout and shedding by up to 85%, due to breakage, in a dry comb test after use of the Densify Shampoo, Conditioner and Serum for 120 days
- Leaves hair visibly thicker and fuller in just 90 days, based on an expert grading evaluation on 34 panelists after use of the Densify Shampoo, Conditioner and Serum
- Minimizes signs of thinning at the scalp for denser-looking partlines and hairlines
Why you'll love it
Use this powerhouse serum just once daily to kickstart your growth potential. It's expertly formulated to optimize each phase of the hair cycle for clinically proven results you can see and feel. The lightweight, non-greasy formula won't weigh down hair, making it easy to apply whether hair is damp or dry.
Who it's for
- HAIR TYPE: Thinning
- SCALP TYPE: All
This serum is made for all hair types experiencing signs of thinning. It's also suitable for chemically-treated hair, color-treated hair and all scalp types.
Ingredients (INCI)
Lactobacillus/(Centella Asiatica/Coffee Seed/Ganoderma Lucidum/Hops/Panax Ginseng Root/Scutellaria Baicalensis Root) Extract/Pea Extract/Rice Seed Extract Ferment Filtrate, Aqua/Water/Eau, Butylene Glycol, 1,2-Hexanediol, Isopentyldiol, Glycerin, Ectoin, Oligopeptide-2, Glycoproteins, Camellia Sinensis Leaf Extract, Larix Europaea Wood Extract, Glucosyl Hesperidin, Inulin, Curcuma Longa (Turmeric) Root Extract, Yeast Extract, Lepidium Meyenii Root Extract, Adenosine, Maltodextrin, Polyglyceryl-3 Cocoate, Polyglyceryl-4 Caprate, Polyglyceryl-6 Caprylate, Polyglyceryl-6 Ricinoleate, Alpha-Glucan Oligosaccharide, Biosaccharide Gum-1, Sodium Phytate, Cellulose Gum, Glycine, Pentylene Glycol, Sodium Levulinate, Glyceryl Caprylate, Cellulose, Glucose, Fructose, Xanthan Gum, Sodium Anisate, Zinc Chloride, Fragrance/Parfum, Citric Acid, Sodium Benzoate, Phytic Acid, Sodium Metabisulfite, Limonene, Linalool [ILN 156915]
Select a thumbnail or swipe the image. Tap the image to enlarge.
Goes with it
Hair
Showing signs of thinning
All hair types, including chemically treated and color-treated hair.
Scalp
All scalp types
Lightweight and non-greasy, it won’t weigh hair down.
Use
Once a day
On dry or towel-dried scalp. Hair doesn’t have to be freshly washed.
The routine behind the result
Visibly thicker, fuller hair in as few as 90 days, with the full Densify routine.
Unretouched photos after 90 days of the Densify Shampoo, Conditioner and Serum; individual results will vary. Based on an expert grading evaluation on 34 panelists.
Up to 85%less hair fallout due to breakage, in a dry comb test after 120 days of the Densify Shampoo, Conditioner and Serum
91%saw less thinning at the scalp, in a consumer evaluation of 34 panelists after 120 days of the Densify Shampoo, Conditioner and Serum
91%said the serum felt lightweight, non-greasy and didn’t weigh hair down, in a consumer evaluation of 34 panelists after 90 days of the serum
Which serum is for you?
Densifying Serum For Thinning Hair
For thinning hair, all scalp types
- Up to 85% less hair fallout from breakage
- Visibly thicker, fuller hair in as few as 90 days
- Apply once daily
Clarify Balancing Serum for Oily Scalp
For oily scalps, all hair types
- Reduces excess oil + refreshes the scalp
- Helps soothe irritation
- Lightweight, won’t weigh hair down
How to use Densifying Serum
- Apply about 2 full droppers to a dry or towel-dried scalp.
- Spread evenly, focusing on the crown, part line and hairline.
- Massage in well. Don’t rinse.
- Use once a day. Hair doesn’t need to be freshly washed.
What’s in it, and what isn’t.
Rootbiomic Ferment™
Our multivitamin superfood: clinically effective proteins, roots and mushrooms, fermented into micronutrients for active, anchored roots, a balanced, hydrated scalp and visibly stronger, healthier hair.
Densifying Peptides
Visibly increase hair density, strength and thickness.
Exosome-Rich Stem Cells from Turmeric Extract
4.7 out of 5, from 43 reviews.
Densifying Serum on REVIEWS.io, as of 9/24/26
I highly recommend!!! Very happy with results!!!
Natalie MVerified Reviewer
Being 42 - I definitely see a difference in my hair texture and want to make sure I maintain it so it doesn't deteriate further or get thinner. really enjoying this serum and will def have it part of my hair treatment now!
GIGI LVerified Reviewer
Questions? We’re rooting for you.
Still curious? Email hello@therootist.com and a team member will be happy to help.
Are your products vegan and cruelty free?
We never test on animals, and all of our products are 100% cruelty-free and vegan friendly. We’re also proud to be Leaping Bunny certified.
Can I use your products on color-treated hair?
All Rootist formulas are designed to be suitable for color treated hair. We avoid harsh surfactants and stripping ingredients to help protect the longevity of color.
Which products are silicone-free?
ALL Rootist products are formulated without silicones. Why? Silicones are pervasive in conventional hair formulas because they offer a temporary fix, like a coating of plastic vinyl over a surface. That’s not our goal. We formulate for the biology and holistic health of the roots, scalp and hair.
Can I use your products if I am pregnant or breastfeeding?
Only your obstetrician can tell you what’s safe for you, but we are not aware of any contraindications during pregnancy or breastfeeding. None of our formulas is made with parabens, formaldehyde, chemical sunscreens, retinol, synthetic hormones or drugs, including minoxidil. If you have any specific questions, we’d recommend that you take a list of the ingredients (found on any product page) to your doctor.
Where are your products made?
Rootist products are produced with globally-sourced ingredients and materials, and made in the U.S. and South Korea.
Worth Rooting For
Our serum addresses signs of thinning. It’s ultra-concentrated with Rootbiomic Ferment, densifying peptides and bioactivated botanicals for improved thickness, fullness and overall hair health.
