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BioBrew™ Fermented Strengthening Serum
Up to 3x less breakage in lab tests on bleached hair, plus less frizz, more shine and heat protection up to 450°F.
4.7You've been looking at Densify. These are the pieces that go together.
Shop DensifyYou've been looking at Strengthen. These are the pieces that go together.
Shop StrengthenYou've been looking at Clarify. These are the pieces that go together.
Shop ClarifyMost people are running low around now. Subscribe and the next one comes on its own.
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AHA+ACV Pre-Shampoo Scalp Clarifying Rinse
The Organic Cotton Towel
Clarify Balancing Serum for Oily Scalp
The Densify Bundle
Densify Shampoo & Conditioner Bundle
Strengthen Concentrated Conditioner
Strengthen Concentrated Shampoo
Clarify Dry Shampoo Powder
The Mini Trial Kit
BioBrew Fermented Strengthening Serum
Densify Concentrated Shampoo
Densifying Serum For Thinning Hair
Densify Concentrated ConditionerRepair damage, minimize breakage, protect from heat and amp up the shine with award-winning BioBrew.
Up to 3x less breakage in one use, lab-tested1
Frizz control for up to 72 hours in 80% humidity2
Visibly improved shine after four weeks, in a study of 39 people3
Heat protection up to 450°F / 232°C
Improved scalp moisturization after four weeks, in a study of 39 people3
1Breakage: based on dry combing on bleached hair tresses. 2Frizz control: when used in 80% relative humidity. 3Shine and scalp moisturization: based on expert clinical grading and instrumentation testing on 39 subjects after 4 weeks of use.
Shop BioBrewPlant-based ingredients fermented + bioactivated for proven results.
Densify Shampoo, Conditioner + Serum
Tested together as one routine, with unretouched before-and-after photos to match.
“The next viral haircare brand is here. Fermented beauty your scalp and strands will love.”
“Best of Beauty Clean Hair Care Winner: AHA+ACV Pre-Shampoo Scalp Clarifying Rinse”Award winner
“Award Winner: Best Scalp Treatment. [BioBrew Serum] is a one-stop shop for shine, strength and smoothing.”Award winner
“[Fermentation] feels like a new concept to us, but to apply this biology to OTC products is absolutely brilliant!”
“This dry shampoo product is genius”
“This is the best dry shampoo I’ve ever used.”
Rootbiomic Ferment™ · Patent‑pending
Eight clinically effective botanicals, fermented into a nutrient-rich broth. Like kombucha for your roots, scalp and hair.
Easily recognized and received by roots, scalp + hair, for anchored, active roots and a hydrated, balanced scalp.
Botanicals responsibly sourced from around the world, in formulas made without silicones.
Chinese skullcap root · Red ginseng root · Reishi mushroom · Coffee berry · Rice + pea proteins · L. plantarum + L. casei
89% of reviewers recommend The Rootist · 772 product reviews on REVIEWS.io
I love this serum so much! Even after just one use I saw and felt a visible difference in my hair. This helps with my frizz and makes my hair look healthier. I love this product so much!
Kristina PVerified Reviewer
ReviewingBioBrew Fermented Strengthening SerumBeing 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
ReviewingDensifying Serum For Thinning HairThis is the best dry shampoo I've ever used. Firstly, it is easy to work through my dark hair without seeing any residue. Secondly, it does not irritate my sensitive scalp OR create buildup, like some other products. It's also very easy to apply with the cute little brush. I am a subscription customer, for sure.
Melisi SVerified Reviewer
ReviewingClarify Dry Shampoo PowderI am in love with this concentrated shampoo. Not just because I use half the amount I would normally use, but because it smells amazing and has a long lasting fragrance that I love, my hair is healthier and stronger, and I am seeing less hair in my brush every day.
Amanda MVerified Reviewer
ReviewingStrengthen Concentrated ShampooHonestly — BioBrew really does work. My color processed hair has been through breakage, and combining this with biotin has strengthened my hair. Even products from bigger brands didn't restore my hair to its original strength. What prevents the perfect 5 is how quickly you can burn through this. It can last up to one month if I'm lucky.
Christina NVerified Reviewer
ReviewingBioBrew Fermented Strengthening SerumOnly used the serum few times and for the first time, I did not need to wash my hair every day! I could go few days without having to wash. It is wonderful serum.
Vera YVerified Reviewer
ReviewingClarify Balancing Serum for Oily ScalpWonderful conditoner. Vegan. I have very long wavy thick hair and live in a very HOT DRY climate. I have tried many other pretty darn good products. But your products are the BEST. My hair after the first use and blowdry...was silky, smooth. Wonderful. Thank you!!!
Lisa TVerified Reviewer
ReviewingStrengthen Concentrated ConditionerUse this one once a week, helps clean scalp and remove buildup, hair feels really soft and clean when using this.
Molly TVerified Reviewer
ReviewingAHA+ACV Pre-Shampoo Scalp Clarifying RinseFind the concern that sounds familiar, then get to know a product before you choose a routine.
A leave-in spray for damp hair.
A serum made for oily scalp.
A serum made for fine + thinning hair.
Still curious? Email hello@therootist.com and a team member will be happy to help.
Start with your main concern: Densify is made for fine + thinning hair, Clarify for oily hair + scalp, and Strengthen for dry + damaged hair. Not sure? Take the 60-second quiz.
Yes. 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.
Yes, every Rootist product is formulated without silicones. They offer a temporary fix, like a coating over the hair, and they aren’t biodegradable. We formulate for the biology and holistic health of the roots, scalp and hair instead.
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.
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. Take the ingredient list from any product page to your doctor if you have questions.
Orders ship for a flat $6.95, and shipping is free on orders of $90 or more. We currently ship within the U.S., including Alaska and Hawaii.
Return it within 60 days of your delivery date. Opened and gently used is fine, as long as at least half is left. Email hello@therootist.com to start a return and we’ll send you a free prepaid label.
Yes. First-time buyers get 10% off their first order by subscribing to Rootist emails.
