Keratin proteins in leave-in hair care
Cosmetic science reviews describe hydrolyzed keratin as a conditioning agent that can help improve hair strength, elasticity, and frizz control in leave-on mist and serum formulations.
About this product
A strengthening leave-in treatment designed to smooth frizz, enhance shine, and support hair integrity—without buildup or heaviness.
Suggested use
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
FDA Disclaimer
What's in Keratin Leave-In Hair Mist?
- Ecocert COSMOS Natural certified
- 99% natural origin
- Hydrolyzed keratin · lactic acid
- Furcellaria lumbricalis algae extract
- Adds shine · softens hair
- No-rinse leave-in mist
- Fresh aquatic · floral · vanilla aroma
- Not vegan — wool-derived keratin
Supplement Facts
Keratin Leave-In Hair Mist
Supplement Facts
Serving Size Spray as needed per use
Servings Per Container See package label
Amount Per Serving
% DV
Formula highlights
Natural origin
99%
Hydrolyzed Keratin
strengthen · smooth
wool-derived
Lactic Acid
condition · shine
Furcellaria Lumbricalis Extract
algae
Full INCI ingredient list
Aqua/Water
—
Butylene Glycol
—
Parfum/Fragrance
aquatic · floral
Sodium Levulinate
—
Hydrolyzed Keratin
—
Sodium Benzoate
—
Lactic Acid
—
Phenethyl Alcohol
—
Furcellaria Lumbricalis Extract
—
Leuconostoc/Radish Root Ferment Filtrate
—
Linalool➀
—
Limonene➀
—
Citrus Aurantium Peel Oil
—
Citrus Limon Peel Oil
—
Citronellol➀
—
Pelargonium Graveolens Flower Oil
—
Pinene➀
—
➀ From natural essential oils.
Other Ingredients: See full INCI list above. Contains animal-derived hydrolyzed keratin (sheep wool).
Free of
- GMO ingredients
- Artificial colors
Diet friendly
- COSMOS Natural certified
- 99% natural origin
- Leave-in · no rinse
- Cruelty-free keratin sourcing
- Recyclable packaging
Shine. Softness. No buildup.
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Keratin strengthening
Hydrolyzed keratin from ethically sourced sheep wool helps strengthen hair, smooth frizz, and support integrity — without the heaviness of oil-based treatments.
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Adds shine & softness
Lactic acid and furcellaria lumbricalis algae extract help enhance shine and soften strands — addressing lack of glow with a fresh, healthy-looking finish.
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Detangles & manages
Improves manageability and detangles damp hair — gentle enough for daily use to maintain healthier-looking hair between washes.
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COSMOS Natural certified
99% natural origin — Ecocert COSMOS Natural certified with full INCI disclosure, recyclable packaging, and green formulation principles.
How it works
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Step 1: Spray
Mist onto clean, damp hair and distribute evenly — a lightweight leave-in that absorbs without rinsing or heavy buildup.
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Step 2: Strengthen
Hydrolyzed keratin helps strengthen and smooth hair — reducing the appearance of breakage and split ends while improving manageability.
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Step 3: Style
Lactic acid and furcellaria lumbricalis algae extract support shine and softness — layer under other styling products on damp hair for best results.
Supplement facts
Formula breakdown — what each layer does
Hydrolyzed Keratin
strengthen · smooth
wool-derived
Cruelty-free sourcing. Does not meet vegan product definition.
Lactic Acid
condition · shine
—
Furcellaria Lumbricalis Extract
algae
botanical
Butylene Glycol
humectant
—
Leave-in — no rinse required.
Aqua/Water
base
—
Parfum/Fragrance
aroma
aquatic · floral
Sodium Levulinate
preservative
—
Sodium Benzoate
preservative
—
Phenethyl Alcohol
preservative
—
Leuconostoc/Radish Root Ferment Filtrate
preservative
natural
Linalool➀
essential oil
—
Limonene➀
essential oil
—
Citrus Aurantium Peel Oil
—
Citrus Limon Peel Oil
—
Citronellol➀
essential oil
—
Pelargonium Graveolens Flower Oil
—
Pinene➀
essential oil
—
➀ From natural essential oils. 99% natural origin.
Evidence-based ingredients
The science behind the ingredients
Keratin Leave-In Hair Mist is COSMOS Natural certified with 99% natural origin and full INCI disclosure — hydrolyzed keratin and lactic acid listed, not a mystery leave-in spray.
99%
Natural origin
COSMOS
Ecocert certified
No-rinse
Leave-in mist
Alpha hydroxy acids in hair conditioning
Cosmetic chemistry literature reports that lactic acid can help improve hair manageability and surface smoothness in rinse-off and leave-in conditioning products.
Algae extracts in cosmetic hair care
Reviews of furcellaria and related red algae extracts describe polysaccharide content that may support hydration and conditioning in topical hair formulations.
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.
Compare keratin hair care
How Monthlees Leave-In Mist stacks up
Many leave-in sprays hide keratin behind proprietary blends. Ours discloses hydrolyzed keratin, lactic acid, and algae extract with COSMOS Natural certification — no-rinse, lightweight, daily use.
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Format
|
No-rinse leave-in spray
|
Rinse-out conditioner
|
|---|---|---|
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Best for
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Daily shine · frizz · styling prep
|
In-shower volume · fortification
|
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Key actives
|
Keratin + lactic acid + algae
|
Keratin + caffeine + rosemary
|
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Member pricing available
|
Yes — Monthlees members
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Yes — Monthlees members
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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
Stop overpaying for keratin leave-in sprays.
Premium keratin leave-in treatments often cost $38–$58 at retail. Monthlees membership keeps COSMOS Natural certified daily mist affordable.
| Treatment | Other guys | Monthlees |
|---|---|---|
| Leave-In Hair Mist monthly supply One bottle — daily or as-needed use | $50.00 | $22.20 |
| Salon keratin leave-in mist Premium retail brands | $38–$58/bottle | COSMOS Natural certified |
| Drugstore leave-in spray Often undisclosed keratin source | $12–$22/bottle | 99% natural origin |
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
- Get your personalized Starter Routine Kit
- Use flexible subscriptions to save on repeat orders
- Manage everything easily from your Monthlees account
- 30-day money back guarantee on all product purchases
- Automatic savings applied at checkout
- 100% flexible. Update, pause, or cancel anytime
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.
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Transparent product pricing
Every product shows clear pricing for guests and members, so you can compare your savings before you buy.
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Member savings applied automatically
When you’re signed in as a member, your eligible discounts are applied automatically at checkout.
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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.
Why is this product not vegan?
Keratin Leave-In Hair Mist contains hydrolyzed keratin derived from sheep wool. While the keratin is ethically sourced and cruelty-free, it is still an animal-derived ingredient — so it does not meet the strict definition of vegan products.
Can I use it daily?
Yes. The mist is gentle enough for daily use on clean, damp hair — spray, distribute evenly, and do not rinse. It helps maintain healthy, shiny, manageable hair without buildup or heaviness.
Can I use it alongside other styling products?
Yes. It layers well with other styling products. For best results, apply Keratin Leave-In Hair Mist first to damp hair, distribute evenly, then follow with your usual styling cream, gel, or heat protectant.
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
