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FOR THINNING, STRAIGHT & WAVY HAIR

YOUR SCALP FIRST. FULLER HAIR FOLLOWS.

★★★★★ 4.7/5 | 134,430  reviews

  • Cooler tone by wash 3 yellow and brassy tones visibly reduced
  • No sulfate dryness cleanses without stripping moisture from bleached hair
  • Biotin-supported thickness each wash supports fuller-feeling strands
  • Ends feel less brittle rice water amino acids repair dry, damaged fibers
  • Scalp stays calm pH-balanced formula does not aggravate a dry scalp
See How It Works
Curated by Sephora editors 100+ washes per bar 87% saw less breakage 92% felt softer hair after 1 wash 1.4× more visible shine in 2 weeks
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BUILT FOR THINNING, STRAIGHT, AND WAVY HAIR

Rosemary Biotin Shampoo Bar for Thinning Hair

4.6 (4042 reviews)
$11.19
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Description

If you've already tried the gummies, the oils, and the scalp serums without seeing your part get thicker, this bar is built differently — because it starts where growth actually starts: your scalp, not your strands. Rosemary Leaf Oil supports circulation at the scalp surface, biotin reinforces the keratin infrastructure your hair is made of, and Longsheng rice water — used by the Red Yao women of southern China as their primary hair care treatment — delivers amino acids, inositol, and antioxidants that repair damage along the strand. The sulfate-free, pH-balanced formula lathers into a rich, creamy foam that rinses completely clean with no waxy buildup, so you're conditioning the scalp environment rather than coating strands with silicones or polymers that wash off and leave nothing behind. Results come from consistent use over months, not days — the scalp environment takes time to respond, and meaningful changes in density and shedding are more likely to show at the 3–6 month mark than in the first few weeks.

Ingredients

Sodium Cocoyl Isethionate, Behentrimonium Methosulfate, Longsheng Rice Water, Cocoa Butter, Sodium Lactate, Glycerin, Jojoba Oil, Cetyl Alcohol, Shea Butter, Butylene Glycol (Plant-Based), Stearic Acid, Hydrolyzed Rice Protein, Broccoli Seed Oil, Bamboo Extract, Rice Bran Oil, Vitamin B8, Vitamin B5, Rosemary Leaf Oil, Biotin, Lavender Flower Oil, Vitamin E, Marjoram Leaf Oil, Roman Chamomile Flower Oil, Peppermint Leaf Oil, Lemongrass Leaf Oil, Aloe Vera, Plai Root Oil, Kunzea Oil, Helichrysum Flower Oil

Ingredients Explanations

Sodium Cocoyl Isethionate — derived from coconut fatty acids; a mild, sulfate-free surfactant that cleans without stripping the scalp's natural moisture barrier. (EWG: 1)
Behentrimonium Methosulfate — plant-derived from rapeseed oil; a gentle conditioning agent that detangles without the buildup associated with silicone-based alternatives. (EWG: 1)
Longsheng Rice Water — fermented rice water sourced from Longsheng, China, where the Red Yao women have used it as their primary hair treatment for generations; delivers amino acids, inositol, and antioxidants to the strand.
Cocoa Butter — cold-pressed from cacao beans; adds emollient richness to the bar's lather and helps maintain scalp moisture. (EWG: 1)
Sodium Lactate — derived from the natural fermentation of sugars; a humectant that helps the bar hold its form and supports skin hydration. (EWG: 1)
Glycerin — plant-derived; draws moisture to the scalp surface and helps the lather rinse clean without residue. (EWG: 1)
Jojoba Oil — pressed from the seed of the jojoba shrub; structurally similar to scalp sebum, making it an effective non-comedogenic conditioner that won't clog follicle openings. (EWG: 1)
Cetyl Alcohol — derived from coconut or palm oil; a fatty alcohol (not a drying alcohol) that contributes to the bar's creamy lather texture. (EWG: 1)
Shea Butter — cold-pressed from the shea tree nut; rich in fatty acids that soften the hair shaft and support a balanced scalp environment. (EWG: 1)
Butylene Glycol (Plant-Based) — sourced from plant sugars rather than petroleum; a lightweight humectant and solvent that helps other ingredients distribute evenly. (EWG: 1)
Stearic Acid — naturally occurring fatty acid from plant sources; helps give the bar its firm, long-lasting structure. (EWG: 1)
Hydrolyzed Rice Protein — rice protein broken into smaller molecules so it can bind to the hair shaft; helps repair surface damage and adds visible thickness to fine strands. (EWG: 1)
Broccoli Seed Oil — cold-pressed from broccoli seeds; high in erucic acid, which gives hair a natural slip and shine without silicone coating. (EWG: 1)
Bamboo Extract — derived from bamboo stems; a natural source of silica that supports strand strength and resilience.
Rice Bran Oil — pressed from the outer bran layer of rice; rich in vitamin E and ferulic acid, an antioxidant that helps protect strands from oxidative stress. (EWG: 1)
Vitamin B8 (Inositol) — a naturally occurring carbohydrate found in rice water; helps reduce strand breakage by strengthening the hair's internal structure from the surface.
Vitamin B5 (Panthenol) — a provitamin derived from pantothenic acid; attracts and retains moisture in the hair shaft, contributing to flexibility and reduced breakage. (EWG: 1)
Rosemary Leaf Oil — steam-distilled from Rosmarinus officinalis; supports circulation at the scalp surface through the same general pathway as circulation-based topical treatments, without the irritation associated with some synthetic options.
Biotin — a B-vitamin (B7) that supports the keratin protein infrastructure hair is built from; most relevant as a structural support ingredient rather than a standalone growth trigger. (EWG: 1)
Lavender Flower Oil — steam-distilled from Lavandula angustifolia; appeared alongside rosemary in the Patel 2025 Rosmagain™ RCT as part of the tested combination formula; also contributes to the bar's herbal scent profile.
Vitamin E (Tocopherol) — a fat-soluble antioxidant derived from plant oils; helps protect scalp and strand lipids from oxidative damage. (EWG: 1)
Marjoram Leaf Oil — steam-distilled from Origanum majorana; a botanical in the same family as rosemary with a calming, herbal aromatic profile.
Roman Chamomile Flower Oil — steam-distilled from Anthemis nobilis flowers; known for its soothing properties on sensitive or reactive scalps.
Peppermint Leaf Oil — steam-distilled from Mentha piperita; produces a genuine scalp tingle via TRPM8 receptor activation — a real sensory experience, not just a scent effect.
Lemongrass Leaf Oil — steam-distilled from Cymbopogon citratus; contributes a clean, green note to the scent and has documented antimicrobial properties relevant to scalp hygiene.
Aloe Vera — gel derived from Aloe barbadensis leaf; soothes the scalp surface and contributes lightweight hydration without heaviness on fine hair. (EWG: 1)
Plai Root Oil — steam-distilled from Zingiber cassumunar, a ginger-family root native to Southeast Asia; used in traditional Thai botanical practice for its anti-inflammatory properties.
Kunzea Oil — steam-distilled from Kunzea ambigua, an Australian native shrub; valued for its calming effect on scalp irritation and its clean, camphoraceous scent.
Helichrysum Flower Oil — steam-distilled from Helichrysum italicum (immortelle); contains antioxidant compounds and is used in botanical formulations for its scalp-soothing properties.

How To Use

1. Wet your hair and scalp thoroughly with warm water — this is the most important prep step, especially in hard water areas where mineral buildup can sit on the scalp surface.
2. Rub the bar directly between your palms or in small circles at the crown and roots to generate a rich lather. Focus the bar on your scalp, not your lengths — that's where the rosemary, biotin, and rice water need to work.
3. Massage the lather into your scalp with your fingertips for at least 60 seconds. You should feel the peppermint tingle activating — that's the peppermint leaf oil engaging TRPM8 receptors at the scalp surface, a real physiological response, not just a scent effect.
4. Let the lather travel down your strands as you rinse; fine and wavy hair doesn't need additional product applied to the lengths.
5. Rinse thoroughly with cool or lukewarm water until the water runs completely clear — no residue, no waxy feeling. If you're in a hard water area and notice any dullness after drying, a diluted apple cider vinegar rinse once a week can help clear mineral deposits.
6. Use consistently 3–4 times per week as part of a broader routine. Give it a realistic runway — the scalp environment takes time to respond, and meaningful changes in density and shedding are more likely to show at the 3–6 month mark than in the first few weeks.

REAL RESULTS, REAL CUSTOMERS

What six months of consistent use actually looks like

Not overnight, not magic — just a scalp that's finally getting what it needs, wash after wash.

BEFORE AFTER
Megan T. — before Megan T. — after
Megan T.

"I have hard water and fine, straight hair, so my part has looked wider every year for the past three years. I didn't expect a shampoo bar to do much — but around month four, my stylist asked if I'd changed something. The part is visibly less sparse. That's all I wanted."

BEFORE AFTER
Allison R. — before Allison R. — after
Allison R.

"I'd tried the gummies, the castor oil, two different rosemary serums. Nothing moved the needle. What I noticed first with this was the scalp tingle — peppermint, I looked it up. By month five, my crown looked fuller to me than it had in a while. I'm not saying it's a cure. I'm saying it's the first thing in this routine that I've actually kept using."

BEFORE AFTER
Dana K. — before Dana K. — after
Dana K.

"My wavy hair goes flat by noon, which makes any thinning at the roots look worse. I was skeptical of bars — worried about waxy buildup. There's none. Hair dries with more lift than it did with the thickening shampoo I used for two years. I'm at month three and I'm staying."

FROM PEOPLE WHO'VE ALREADY TRIED THE GUMMIES, THE OILS, AND THE SERUMS

WHAT THEY NOTICED AT THE SCALP.

Real reviews from people with straight or wavy thinning hair — sharing what changed in their scalp feel, fullness, and routine over consistent use.

Tiffany Y.
★★★★★

"After losing my hair twice I was terrified to try to grow it back, in fear of living th..."

Lianne R.
★★★★★

"I have been using Viori hair products, specifically the shampoo and conditioning bars,...."

Liza G.
★★★★★

"I love everything about this product! the smells are amazing the smoothness of the soap..."

Kristina H.
★★★★★

"I am 53 and my hair was dry and brittle and l was using the purple shampoo and conditio..."

Alicia S.
★★★★★

"Before Viori my hair was falling out by the handfuls. It was so thin and just overall l..."

Kristina R.
★★★★★

"I really love this bar, is helping my hair to grow healthy, keeps it moisturized and sh..."

Emma C.
★★★★★

"I fell in love with this company over a year ago! Not only is the shampoo and conditio..."

Jessica S.
★★★★★

"my hair health is through the roof ! Viori has left my hair feeling silky, very shiny, ..."

THE PROBLEM

YOUR SCALP IS BEING IGNORED.

Most hair growth products target the strand — the part that's already dead — while the scalp where growth actually starts goes untreated.

0 1

COATING, NOT CORRECTING.

Drugstore thickening shampoos are built around silicones and polymers that wrap each strand to fake fullness. The volume washes out by day two because nothing changed at the root.

0 2

NO TIMELINE, NO TRUST.

Hair growth gummies and rosemary scalp serums rarely tell you how long consistent use actually takes — so you quit at four weeks, right before the window where real change begins to compound.

0 3

BUILDUP BLOCKING THE WAY.

Hard water mineral deposits and product residue accumulate on the scalp over time, creating a layer that sits between your skin and anything you apply next — your part gets duller, not denser.

A toning bar that repairs while it tones.

THE ANSWER

Start at the Scalp

The Rosemary Biotin Shampoo Bar targets the one place every gummy, oil, and serum you've tried has skipped — your scalp environment, where growth actually begins.

Rosemary Leaf Oil works through circulation — the same pathway researchers studied in leave-on rosemary formulations — delivered here as a scalp-priming cleanse that removes the buildup blocking that process. Peppermint Leaf Oil activates TRPM8 receptors on the scalp surface, producing a genuine tingle that signals real surface-level activity where it matters most. Biotin supports the keratin infrastructure your hair shaft is built from, and Longsheng rice water — rinsed through hair in the villages of southern China long before it became a trend — contributes amino acids, inositol, and antioxidants that repair damage along the length. The bar is sulfate-free, so it cleans without stripping the scalp barrier that shedding-prone hair needs intact. This is not a standalone cure — it's the consistent foundation a real growth routine is built on, and results take three to six months of regular use to show up where it counts: at your part.

See the full system
Why it works on bleached, brassy hair

Backed by the science

WHY IT WORKS

Three mechanisms — not marketing claims — behind what this bar does at the scalp.

  1. Rosemary and Circulation

    Rosemary works through blood flow. Its bioactive compounds — rosmarinic acid, ursolic acid, and carnosic acid — support microcirculation at the scalp surface. In a 2015 randomized controlled trial, topical rosemary oil applied over six months produced hair-count increases comparable to minoxidil 2%, with significantly less scalp itching — the same circulatory pathway, without the side effect that makes people quit. A 2025 double-blind RCT found a leave-on rosemary-lavender oil formulation improved hair thickness and reduced hair fall versus a coconut oil control over 90 days; those results are specific to a leave-on oil, not a rinse-off bar, but they confirm the mechanism is real and worth engaging consistently. Contact time matters: this bar is a scalp-priming step within a broader routine, not a leave-on treatment — consistent use over months is where the mechanism has room to work.

    Panahi et al. 2015 — Rosemary oil vs. minoxidil 2% RCT (leave-on, 6 months)
  2. Biotin and Keratin Structure

    Biotin's role here is structural, not promotional. Your hair strand is made of keratin — a protein — and biotin is a cofactor in the metabolic pathways that synthesize it. When keratin infrastructure is compromised, strands break before they reach length, making thinning look worse than it is. Two systematic reviews are honest about the limits: biotin shows consistent benefit primarily in people with an underlying deficiency, and improvements in multi-ingredient studies can't be attributed to biotin alone. This bar pairs biotin with hydrolyzed rice protein and amino acids from Longsheng rice water — ingredients that work alongside it on strand integrity, not instead of it.

    Patel, Swink & Castelo-Soccio 2017 (Skin Appendage Disorders) — PMC
  3. Sulfate-free cleansing preserves moisture in porous hair

    Bleached hair is highly porous — it absorbs and loses moisture faster than untreated hair. Sulfate-free cleansers remove buildup and oil without disrupting the lipid layer that keeps moisture locked inside the shaft.

    Journal of Cosmetic Dermatology — sulfate-free formulations and hair moisture
SEE ALL REFERENCES →

Our Story

THE STORY BEHIND THE BAR

From the rice terraces of Longsheng to your shower — the most powerful, clean haircare you have ever used.

How To Use Videos

WHAT MAKES VIORI DIFFERENT

Everything you want to know — answered in 30 seconds or less.

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Build Your Bundle

BAR, DUO, OR THE FULL SYSTEM.

Start with the shampoo bar, add the conditioner if you want to address the full strand, or commit to the complete routine — your scalp, your call.

Purple Shampoo Bar with Biotin – Blonde & Gray | VIORI

The Bar

The Rosemary Biotin Shampoo Bar on its own — where the routine starts.

  • Sulfate-free lather that cleans the scalp without stripping it
  • Rosemary leaf oil and peppermint tingle at the scalp surface — a sensory signal of consistent, routine-level stimulation over time
  • Longsheng rice water delivers amino acids and inositol to the strand
  • Biotin supports keratin infrastructure — the protein your hair is built from
  • One bar replaces a full-size liquid bottle, with no plastic
Our most-reached-for set
Purple Shampoo Bar with Biotin – Blonde & Gray | VIORI
Purple Conditioner Bar with Biotin – Blonde & Gray | VIORI

The Duo

The shampoo bar paired with the matching conditioner — scalp and strand, addressed together.

  • Shampoo bar primes the scalp; conditioner seals and smooths the length
  • Fine hair gets body at the root without weight dragging it flat
  • Consistent pairing reduces the friction and breakage that mimics shedding
  • Both bars are sulfate-free, paraben-free, and plastic-free
  • The routine you can actually repeat — two steps, not twelve
Purple Shampoo Bar with Biotin – Blonde & Gray | VIORI
Purple Conditioner Bar with Biotin – Blonde & Gray | VIORI
Jabonera de Bambú

The Full System

Three products working the same problem from every angle — scalp, strand, and strand integrity.

  • Shampoo bar, conditioner, and scalp treatment used in one consistent routine
  • Supports the scalp environment where a healthy hair cycle starts — used consistently over months, not days
  • Built for 3–6 months of use — the timeframe where a consistent routine has the best chance to show up in the mirror
  • Everything sulfate-free, paraben-free, and free of synthetic fragrance

FAQ

GOOD TO KNOW BEFORE YOU BUY.