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Keratin Gentle Volume Shampoo
(26)Reviews

Keratin Gentle Volume Shampoo

Ecocert COSMOS Natural volumizing shampoo — hydrolyzed keratin, caffeine, and rosemary cleanse and reactivate the scalp for extra body without weighing hair down.

A keratin-enriched volumizing shampoo that gently purifies scalp and hair while enhancing body, smoothness, and strength for fuller-looking results — 99% natural origin, gluten free, nut free, with hydrolyzed keratin, caffeine, sodium PCA, and organic rosemary and peppermint for thickening care on all hair types.

Your Monthlees pricing

Traditional Retail Estimated market comparison. Not the price you pay.
$37.95
Guest Price $31.95
Member Price Join to unlock your best price Your member price is applied
Delivery Frequency

Rachel N., Rochester, NY

Monthlees Member

"Volume at the root without the strip."

My fine hair goes flat and most volumizers leave it squeaky. This lists hydrolyzed keratin, caffeine and organic rosemary in the INCI and cleans without stripping. I follow with the matching conditioner, and the member price beat the salon shampoos I'd been buying.

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About this product

A keratin-enriched volumizing shampoo that gently purifies scalp and hair while enhancing body, smoothness, and strength for fuller-looking results.

Suggested use

For external use only. Massage into wet hair and scalp, lather, and rinse thoroughly.

Follow with Keratin Gentle Volume Conditioner on mid-lengths and ends for a complete volume-enhancing routine.

Avoid contact with eyes. If contact occurs, rinse with water. Discontinue use if irritation occurs.

Store at room temperature. Keep out of reach of children.

About monthlees

The supplement industry is built on inflated pricing, confusing labels, and aggressive marketing.

Monthlees exists to fix that.

We believe:

  • Supplements should be clinically dosed
  • Pricing should be transparent
  • Testing should be independent
  • And customers shouldn't pay for influencer commissions or retail margins

Instead of hiding costs inside the product price, we use a simple membership model — so you pay what supplements actually cost to make.

Shipping & returns

• Shipping: Orders are processed within 1–2 business days. Standard delivery takes 3–7 business days depending on your location.
• Returns: You may return or exchange products within 30 days of receiving your order. Items must be in original condition with proof of purchase.
If your item is defective or damaged due to manufacturing issues, we’ll gladly replace it at no additional cost.

30 Day Money Back Guarantee

Try Keratin Gentle Volume Shampoo for 30 days. If you're not satisfied, contact support@monthlees.com and our team will help with a refund, return, or store credit per our policies.

FDA Disclaimer

For external use only. Avoid contact with eyes. If irritation occurs, discontinue use.

This is a personal care product — not a dietary supplement. Contains hydrolyzed keratin. Results may vary.

COSMOS NATURAL certified by ECOCERT Greenlife according to the COSMOS Standard (cosmos.ecocert.com).

What's in Keratin Gentle Volume Shampoo?

This is a hair care shampoo — not a supplement facts panel. The formula is 99% natural origin, Ecocert COSMOS Natural certified, and built around hydrolyzed keratin, caffeine, rosemary oil, and sodium PCA for gentle cleansing, scalp reactivation, and extra volume.

  • Ecocert COSMOS Natural certified
  • 99% natural origin · 4% organic
  • Hydrolyzed keratin · caffeine
  • Organic rosemary · peppermint
  • Sodium PCA · zinc PCA
  • Organic chanterelle extract
  • Gluten free · nut free
  • Peppermint · rosemary · tonka · sandalwood aroma

Free of

  • Gluten
  • Nuts
  • GMO ingredients
  • Artificial colors

Diet friendly

  • COSMOS Natural certified
  • 99% natural origin
  • Keratin · caffeine volume care
  • Gluten free · nut free
  • Recyclable packaging

Cleanse. Volume. Strength.

A COSMOS Natural certified shampoo for lack of volume — hydrolyzed keratin, caffeine, and organic botanical extracts in one gentle volumizing cleanser.

  • Keratin fortification

    Keratin fortification

    Hydrolyzed keratin helps strengthen and protect against breakage — leaving hair soft, smooth, and refreshed after every wash.

  • Extra volume

    Extra volume

    Caffeine, sodium PCA, zinc PCA, and a hydrating complex help enhance body and thickening without weighing hair down — ideal for lack-of-volume concerns.

  • Scalp reactivation

    Scalp reactivation

    Organic rosemary and peppermint oils with menthol help reactivate the scalp during massage — paired with organic chanterelle extract for botanical care.

  • COSMOS Natural certified

    COSMOS Natural certified

    99% natural origin, 4% organic — Ecocert COSMOS Natural certified, gluten free, nut free, with recyclable packaging and green formulation principles.

How it works

  1. Lather

    Step 1: Lather

    Massage into wet hair and scalp — plant-derived surfactants create a gentle lather that purifies without harsh stripping.

  2. Fortify

    Step 2: Fortify

    Hydrolyzed keratin, caffeine, and organic rosemary help strengthen strands, reactivate the scalp, and support fullness and manageability.

  3. Rinse

    Step 3: Rinse

    Rinse thoroughly for soft, smooth, refreshed hair with enhanced volume and body — follow with Keratin Gentle Volume Conditioner for best results.

Supplement facts

Formula breakdown — what each layer does

Three panels cover the shampoo — volume actives, cleansing base, and full INCI disclosure. This is a personal care product, not a supplement facts panel.

Hydrolyzed Keratin
strengthen
—
Caffeine
volume · scalp
—
Sodium PCA
hydrate
—
Zinc PCA
scalp care
—
Cantharellus Cibarius (Chanterelle) Extract➀
botanical
organic
Topical hair care actives. 99% natural origin.
Lauryl Glucoside
cleanser
—
Sodium Coco-Sulfate
cleanser
—
Disodium Cocoyl Glutamate
cleanser
—
Sodium Cocoyl Glutamate
cleanser
—
Coco-Glucoside
cleanser
—
Glyceryl Oleate
conditioner
—
PCA Glyceryl Oleate
conditioner
—
Gentle volumizing cleanse. Organic glycerin➁ for hydration support.
Aqua/Water
base
—
Glycerin➁
humectant
organic
Citric Acid
pH adjuster
—
Parfum/Fragrance
aroma
peppermint · tonka
Sodium Chloride
viscosity
—
Benzyl Alcohol
preservative
—
Sodium Benzoate
preservative
—
Potassium Sorbate
preservative
—
Leuconostoc/Radish Root Ferment Filtrate
preservative
natural
Rosmarinus Officinalis Leaf Oil➀
rosemary
organic
Mentha Piperita Oil➀
peppermint
organic
Menthol➂
essential oil
—
Limonene➂
essential oil
—
Camphor➂
essential oil
—
Citrus Aurantium Bergamia Peel Oil
—
Pinene➂
essential oil
—
➂ From natural essential oils. Gluten free. Nut free. 4% organic origin.
Research-backed supplement formula visual
Evidence-based ingredients

The science behind the ingredients

Keratin Gentle Volume Shampoo is COSMOS Natural certified with 99% natural origin and full INCI disclosure — hydrolyzed keratin, caffeine, and rosemary listed, not a mystery volumizing formula.
99%
Natural origin
COSMOS
Ecocert certified
Keratin
+ caffeine
Review Hydrolyzed keratin

Keratin proteins in hair care

Cosmetic science reviews describe hydrolyzed keratin as a conditioning agent that can help improve hair strength, elasticity, and manageability in rinse-off shampoo formulations.
View on PubMed
Review Caffeine in hair care

Caffeine and hair follicle research

Research on topical caffeine in hair care explores its potential effects on hair follicle biology and scalp circulation — relevant to volumizing and scalp-reactivation positioning.
View on PubMed
Review Rosemary oil

Rosemary oil in scalp and hair care

Botanical reviews discuss rosemary essential oil as a traditional scalp-care ingredient — supporting its use alongside keratin in volumizing shampoo formulas.
View review
Standard COSMOS Natural

COSMOS Natural certification standard

The COSMOS standard defines requirements for natural and organic cosmetics — including ingredient origin, environmentally friendly processing, and responsible use of natural resources.
View COSMOS standard

Compare keratin volume routine

How Monthlees Keratin Volume Shampoo stacks up

Many volumizing shampoos hide actives behind proprietary blends. Ours lists hydrolyzed keratin, caffeine, and rosemary with full INCI disclosure — pair with the matching conditioner for a complete routine.
How Monthlees Keratin Volume Shampoo stacks up
Keratin Gentle Volume Shampoo

Monthlees Keratin Volume Shampoo

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Keratin Gentle Volume Conditioner

Keratin Volume Conditioner

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Step in routine
Cleanse scalp & hair
Condition mid-lengths & ends
Key actives
Keratin + caffeine + rosemary
Keratin + caffeine + vitamin E
Certification
Ecocert COSMOS Natural
Ecocert COSMOS Natural
Member pricing available
Yes — Monthlees members
Yes — Monthlees members

Insider access to the world's best labs & supplement manufacturers.

Membership allows us to sell products for a fraction of the typical industry retail price. Think of it as an insider access pass to the warehouses of the supplement industry.


Monthlees members don't pay for:

  • Middlemen
  • Marketing & influencer costs
  • Retailer markups
  • Distributor margins

$$$

Retailer markups
Middleman's cut
Cost of manufacture

What you'll pay at traditional retail

$$

Monthlees guest

What you'll pay as a guest

$

Monthlees member

What you'll pay as a Monthlees member

Stop overpaying for salon volumizing shampoos.

Premium keratin volume shampoos often cost $32–$52 at retail. Monthlees membership keeps COSMOS Natural certified cleansing affordable for every wash.
Half the cost
Treatment Other guys Monthlees
Keratin Volume Shampoo monthly supply One bottle — regular washes $37.95 $19.17
Salon keratin volume shampoo Premium retail brands $32–$52/bottle COSMOS Natural certified
Drugstore volumizing shampoo Mass-market formulas $10–$18/bottle 99% natural origin
Traditional retail reflects common brand retail pricing for comparable COSMOS Natural keratin and volumizing shampoos. Member pricing requires an active Monthlees membership and is confirmed at checkout.
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Start your monthlees health journey with complete support

Your membership gives you access to better pricing, personalized guidance, and everything you need to build a healthy supplement & personal care routine that effortlessly fits your life.

  • Unlock member pricing of 50-80% off on every product
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  • 30-day money back guarantee on all product purchases
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Member trust

Confidence built into every order

From clear member pricing to flexible subscriptions and responsible product standards, Monthlees is built to help you shop with confidence — without inflated markups, hidden tiers, or checkout surprises.

  • GMP Certified Facilities
  • FDA Compliant Facilities
  • Third party tested

  • Transparent product pricing

    Every product shows clear pricing for guests and members, so you can compare your savings before you buy.

  • Member savings applied automatically

    When you’re signed in as a member, your eligible discounts are applied automatically at checkout.

  • Subscriptions that stay flexible. Cancel anytime.

    Start, pause, skip, or adjust product subscriptions from your account — without hidden hoops or confusing rules.

Frequently asked questions

Everything you need to know about Monthlees member pricing, subscriptions, and how checkout works.

Will this weigh down fine or flat hair?
It's formulated to enhance volume and body without weighing hair down. Massage into the scalp to reactivate and thicken at the root, then rinse thoroughly. Pair with Keratin Gentle Volume Conditioner on mid-lengths and ends only.
Should I pair it with Keratin Gentle Volume Conditioner?
Yes. Keratin Gentle Volume Shampoo and Keratin Gentle Volume Conditioner are designed as a complete volume-enhancing routine — shampoo cleanses scalp and hair; conditioner treats mid-lengths and ends for fortification and extra body.
What key actives are listed in the INCI?
The formula discloses hydrolyzed keratin, caffeine, sodium PCA, zinc PCA, organic chanterelle extract, and organic rosemary and peppermint oils — see the full INCI list on the product page. Gluten free and nut free.

Why I created monthlees...

When I was 19 years old, I was diagnosed with a brain tumor. That experience forced me to start asking deeper questions about how the human body actually works.

Over the next 18 months, I immersed myself in studying health, nutrition, and neuroscience — eventually earning my degree in Neuroscience from Duke University. Along the way, I discovered something powerful: the body is incredibly resilient & inherently self-healing when it’s given the right support.

Strategic nutrition and supplementation became a major part of my own health journey. And over the last two decades, I’ve devoted my life to helping millions of people around the world take a more proactive role in their health.

That experience completely changed how I thought about health — and ultimately shaped the way Monthlees was built.

I created Monthlees because I was tired of seeing people pay premium prices for supplements that were under-dosed, over-marketed, and difficult to trust.

My goal is simple: build the kind of brand I would want for myself and my family — with better ingredients, transparent formulas, meaningful dosages, and a business model built on long-term trust.

— Chris Walker, Founder of Monthlees

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