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
BioBrew Fermented Strengthening Serum
One-time price 4.7 · 126 reviews
- Free shipping $90+
- Ships in 2 business days
- 60-day returns
Real Simple Smart Beauty Award Winner 2024: Best Scalp Treatment
Our lightweight leave-in for both hair and scalp. For hair, this serum spray is clinically shown to control frizz, boost shine, protect from heat and repair damage, with up to 3x less breakage in just one use in lab tests on bleached hair. For scalp, this serum is microbiome-friendly, derm-tested and restores balance and hydration.
Free from:
- No silicones
- No sulfates
- No parabens
- No phthalates
- No mineral oil
What it does
- Up to 3x less hair breakage in just one use, in lab tests on bleached hair
- Protects hair from heat up to 450ºF / 232ºC
- Controls frizz for up to 72 hours in 80% humidity
Why you'll love it
The key step in your healthy hair ritual, this do-it-all bi-phase serum spray blends the nourishment of an oil with the lightweight treatment power of a serum for dramatically stronger, healthier hair.
Who it's for
- HAIR TYPE: Weak or Damaged
- SCALP TYPE: Normal to Dry
BioBrew was formulated to strengthen weak, damaged hair but is for anyone who wants healthy-looking, shiny hair, frizz control and heat protection in one. It’s suitable for color-treated and chemically treated hair. BioBrew is scalp microbiome-friendly and made for normal to dry scalps. If you have an oily scalp, we suggest only applying BioBrew to your hair and not directly to your scalp.
Ingredients (INCI)
Lactobacillus/(Centella Asiatica/Coffee Seed/Ganoderma Lucidum/Hops/Panax Ginseng Root/Scutellaria Baicalensis Root) Extract/Pea Extract/Rice Seed Extract Ferment Filtrate, C13-15 Alkane, Dioctyldodecyl Dodecanedioate, Ethylhexyl Pelargonate, Water/Aqua/Eau, Pentylene Glycol, Butylene Glycol, 1,2-Hexanediol, Hydrolyzed Yeast Protein, Tetrahexyldecyl Ascorbate, Tocopheryl Acetate, Sphingomonas Ferment Extract, Inulin, Hydroxypropylammonium Gluconate, Alpha-Glucan Oligosaccharide, Saccharide Isomerate, Hydroxypropylgluconamide, Sodium Acetylated Hyaluronate, Sodium Hyaluronate, Sodium Hyaluronate Crosspolymer, Hydrolyzed Sodium Hyaluronate, Caesalpinia Spinosa Fruit Pod Extract, Helianthus Annuus (Sunflower) Sprout Extract, Moringa Oleifera Seed Oil, Melia Azadirachta Extract, CoccinianIndica Fruit Extract, Eclipta Prostrata Extract, Sodium Citrate, Heptyl Glucoside, Glycerin, Maltodextrin, Polyglyceryl-10 Laurate, Sodium Phytate, Sodium Benzoate, Potassium Sorbate, Glycolic Acid, Citric Acid, Tartaric Acid, Benzyl Alcohol, Ethylhexylglycerin, Citral, Citronellol, Geraniol, Hydroxycitronellal, Limonene, Linalool, Fragrance/Parfum [ILN 157337]
Select a thumbnail or swipe the image. Tap the image to enlarge.
Goes with it
Hair
All hair types and textures
Including color-treated and chemically treated hair.
Scalp
Made for normal to dry scalps
Oily scalp? Spray it on your lengths only.
Styling
Air dry or heat style
You’ll see the benefits either way, with heat protection up to 450°F.
The routine behind the result
Visibly stronger, healthier hair over time.
Shown after one use of Strengthen Concentrated Shampoo + Conditioner, then BioBrew, blow-dried with a diffuser. Individual results will vary. Percentages from a 4-week study of 39 people.
3,400fewer broken strands on average, in lab tests on bleached hair
94%had improved scalp moisturization
94%had visibly improved texture
92%had visibly improved shine
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 BioBrew™
- Shake well.
- Spray damp, towel-dried hair from 2–3 inches away, scalp to ends.
- Use about 3 pumps at the scalp and 3–5 on the lengths, depending on hair texture, density and length.
- Massage your scalp gently and comb through. Don’t rinse.
- Style as usual. Use 2–3 times a week.
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.
Bio-Peptides
Rich in collagen, keratin and proteins to help strengthen hair from root to tip.
Vitamin C
Tetrahexyldecyl ascorbate. Visibly repairs the hair cuticle to improve vibrancy and shine.
4.7 out of 5, from 126 reviews.
BioBrew on REVIEWS.io, as of 9/22/26
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
Honestly — 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
Keeps my hair really smooth and detangled
Molly TVerified Reviewer
Wonderful truly wonderful
Genevieve CVerified Reviewer
Questions about BioBrew?
Still curious? Email hello@therootist.com and a team member will be happy to help.
Do you have to rinse out this product?
No, this is a leave-in spray serum that you spray on your damp, towel-dried scalp and strands and style as usual.
Is BioBrew™ made for all scalp types?
BioBrew™ was formulated for normal to dry scalps. It is scalp microbiome friendly and made with our Rootbiomic Ferment™ to promote a hydrated, balanced scalp. If you have an oily scalp, you may want only to apply BioBrew™ to your hair and avoid applying added oil to your scalp that could weigh down roots.
Will BioBrew™ weigh down my hair?
Everyone’s hair is different. When using for the first time, start with 2-3 sprays, massage thoroughly and comb to distribute evenly. If you have an oily scalp, apply only to strands.
Do I need to use heat to see the benefits of BioBrew™?
No, you will see the benefits of BioBrew™ whether you air dry or use heat.
When will I see the benefits of BioBrew™?
In clinical testing, BioBrew™ is shown to deliver visible results both instantly and over time.
In just one use:
- Up to 3x less hair breakage, in lab tests on bleached hair
- Protect from heat up to 450˚F
- Control frizz for up to 72 hours in 80% humidity
- Boost shine + smooth texture
- Revitalize roots, scalp, and hair
After four weeks of use, in a study of 39 people:
- 94% had improved scalp moisturization
- 94% had visibly improved texture
- 92% had visibly improved shine/gloss/luster
Will this serum spray work on my hair?
Our BioBrew™ Serum is made for all hair types and textures and is suitable for chemically and color-treated hair.
What kind of damage does BioBrew™ repair?
BioBrew™ is designed to improve strength, control frizz, and repair damage caused by heat styling, chemical treatments, plus physical and environmental stressors.
Can I use BioBrew™ on dry hair?
BioBrew™ was designed for damp, towel-dried hair, and we recommend using it for the best results.
Can I use BioBrew™ on my eyebrows?
BioBrew™ was not designed, intended, or tested for use on eyebrows. Please use only as directed.
Can I layer a styling cream or another styling product over BioBrew™?
Absolutely! BioBrew™ plays well with others. It is a lightweight serum with a fine texture, so we recommend applying it as the first step in your routine. Apply to clean towel-dried hair before layering on cream products. Typically, products layer best when you apply the thinnest to thickest in texture.
Are these bottles recyclable? Is your serum sustainable?
Yes. Our serum bottles are made from glass and are easily recyclable. We ask that you hold onto your serum pump and use it when you purchase a serum prefill. Our serum is sustainably designed with responsibly sourced ingredients.
Worth Rooting For
Biobrew is a must-have serum that’s a hardworking hair hero. Think instant frizz control, supreme shine and heat protection for the ultimate wellness ritual for roots, scalp and hair.
