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
Clarify Balancing Serum for Oily Scalp
- Free shipping $90+
- Ships in 2 business days
- 60-day returns
A lightweight, leave-in salicylic acid serum for oily scalps that reduces and controls excess oil where it starts.
What it does
- Reduces excess oil + refreshes the scalp
- Helps soothe irritation
- Lightweight serum won't weigh down hair
Why you'll love it
Get oil under control. Excess oil–aka an oily scalp–can make clean hair look dirty, and make it harder to style. This scalp-loving serum targets and reduces excess oil, without drying out the scalp, for the ultimate balance. Add to your healthy hair ritual to keep oil in check and your scalp hydrated and soothed.
Who it's for
- HAIR TYPE: All
- SCALP TYPE: Oily
Our Clarify Serum is formulated to control excess oil on the scalp and is suitable for all hair and oily 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, Butylene Glycol, 1,2-Hexanediol, Polyglyceryl-4 Caprate, Propanediol, Arginine, Lactic Acid, Glycerin, Water/Aqua/Eau, Salicylic Acid, Zinc PCA, Leptospermum Scoparium Leaf Extract, Chlorella Vulgaris Extract, Allantoin, Hydrolyzed Yeast Protein, Inulin, Saccharide Isomerate, Alpha-Glucan Oligosaccharide, Sarcosine, Fructose, Glucose, Rosmarinus Officinalis (Rosemary) Leaf Oil, Ormenis Multicaulis Oil, Mentha Piperita (Peppermint) Oil, Mentha Viridis (Spearmint) Leaf Oil, Melia Azadirachta Leaf Extract, Melia Azadirachta Flower Extract, Sodium Benzoate, Cellulose, Cellulose Gum, Potassium Sorbate, Pentylene Glycol, Xanthan Gum, Sodium Citrate, Citric Acid, Potassium Hydroxide, Limonene, Linalool [ILN 157610]
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Goes with it
Hair
All hair types
A lightweight serum that won’t weigh hair down.
Scalp
Made for oily scalps
Reduces excess oil where it starts, without drying out the scalp.
Use
2–3 times a week
On a clean or towel-dried scalp, morning or night. Don’t rinse.
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 Clarify Serum
- Apply about 2 full droppers to a clean or towel-dried scalp.
- Spread evenly through the crown, focusing on areas of concern.
- Massage in well. Don’t rinse; style as usual.
- Use 2–3 times a week, morning or night.
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.
1% BHA
Salicylic acid. Exfoliates and clarifies the scalp by helping to break down excess oil.
Chlorella
Chlorella vulgaris extract. Nourishing superfood hydrates, soothes, and rebalances oil.
4.6 out of 5, from 98 reviews.
Clarify Serum on REVIEWS.io, as of 9/24/26
Only 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
Questions about Clarify Serum?
Still curious? Email hello@therootist.com and a team member will be happy to help.
Do you have to rinse out this product? Can I layer other products over it?
This is a leave-in treatment serum that you will not rinse out. Once you apply, you can follow with your regular styling products.
Can I use the Scalp Clarifying Serum and BioBrew™ together?
You can use the serums together if you have an oily scalp and want to repair weak or damaged strands. In that case, we suggest applying the clarifying serum to your scalp where you are concerned with oil and then applying BioBrew™ to your strands.
Can I layer my regular styling products over this serum?
Yes! We recommend using the clarifying serum on a clean, towel-dried scalp before using other styling products.
How does this serum control oil?
The Clarifying Serum is formulated with ingredients like salicylic acid, known for their ability to gently break down and rebalance excess oil, soothe dryness, and reduce visible redness. To see the best results in oil control, use it consistently in your hair routine.
Can I use the serum if I have a sensitive scalp? If I use it regularly, will it dry out my scalp?
The Clarifying Serum is formulated to control excess oil, but not all oil on the scalp. At the Rootist, we know the importance of protecting and nourishing our scalp and its microbiome. So, in addition to the oil control ingredients in the formula, it also contains the Rootbiomic Ferment™ to ensure the scalp is nourished, hydrated, and balanced. If you have a tendency toward sensitivity or have a known allergy, please check the label, and if you have any concerns, please patch test.
Can I apply this serum only to clean, towel-dried scalp? Or can I use it in between wash days on dry hair?
We recommend using the clarifying serum on a clean, towel-dried scalp. If you want help controlling excess oil on non-wash days, we suggest trying our talc-free Dry Shampoo Powder that absorbs excess oil and sweat like a sponge.
Can I use this on my dry, flaky scalp?
If you’re experiencing a dry, flaky scalp, we recommend using our AHA ACV Pre-Shampoo Rinse to clarify excess oil gently, product build-up, and dry, flaky scalp without stripping moisture.
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 dropper and use it when you purchase a serum prefill. Our serum is sustainably designed with responsibly sourced ingredients.
Worth Rooting For
Getting an oily scalp under control is worth rooting for, so when dry shampoo isn’t getting to the root cause of oil, this serum won’t strip natural moisture while soothing the scalp. Think of this product as a toner for your scalp to help balance oil.
Pro tip: You’ll know your scalp needs an oil check when your roots start to look oily shortly after wash day, or if your style isn’t holding.
