Free Standard Shipping on $50+ Orders
free returns. buy with confidence

PEPTIDE PREP™ pH maintenance shampoo

Color-safe, pH-optimized cleansing shampoo formulated with K18PEPTIDE™
Rated 4.3 out of 5
Based on 61 reviews
8.5 oz
A color-safe, pH-optimized shampoo with K18PEPTIDE™ to effectively cleanse while maintaining hair health for hair that feels strong, smooth, and healthy.
  • pH-optimized pH-optimized
  • microbiome-friendly microbiome-friendly
  • 17 ingredients + patented peptide 17 ingredients + patented peptide
FREE RETURNS
Every purchase supports K18 x Plastic Bank efforts to radically simplify waste.
This year we'll stop
52 Metric tons of plastic
=
2.6M+ single use plastic bottles from reaching the ocean

How it works

An optimized pH helps maintain the hair cuticle, which prevents excess water from entering the hair. Water entering the hair can cause damage, dullness, frizz, and tangling.

This pH maintenance shampoo:

Cleanses while smoothing the hair surface: Effective yet safe cleansers break down and remove dirt + oil for optimal nourishment and manageability.

Designed for daily use: pH-balanced formula doesn’t disrupt the hair fiber or scalp environment and is safe to use daily if needed.

Creates the ideal foundation for healthy hair: This formula was engineered to create an optimal clean canvas without any fillers to coat or disrupt the hair and scalp equilibrium.

Key benefits

An optimized pH shampoo (4.5-5.5) helps prevent excess swelling of the hair cuticle to help reduce frizz, preserve color, and maintain health and shine—especially important for damaged hair. An optimized pH also helps preserve the scalp microbiome and is gentle enough to use every time you cleanse.

  • 91% said hair feels healthier, smoother, and does not feel weighed down*
  • Certified microbiome-friendly: Scalp microbiome is preserved for a healthier-feeling scalp and a gentler cleanse
  • Color is maintained
  • Hair feels strong + healthy, appears smooth with reduced frizz
  • Hair is moisturized without being weighed down, easier to style + less tangled
  • Non-Sensitizing
  • Dermatologist tested

*results observed on 35 people after 21 days

How to use

  1. Safe to use every time you wash.
  2. Massage into hair, focusing on scalp.
  3. Thoroughly rinse.
  4. Repeat as needed

Ingredients

Water (Aqua) (Eau), Sodium C14-16 Olefin Sulfonate, Cocamidopropyl Betaine, Sodium Methyl 2-Sulfolaurate, Sodium Lauryl Sulfoacetate, sh-Oligopeptide-78, Panthenol, Glycerin, Sodium Phytate, Guar Hydroxypropyltrimonium Chloride, Disodium 2-Sulfolaurate, Caprylyl Glycol, Caprylhydroxamic Acid, Benzoic Acid, Citric Acid, Sodium Hydroxide, Fragrance (Parfum), Limonene.

Description

A color-safe, pH-optimized shampoo with K18PEPTIDE™ to effectively cleanse while maintaining hair health for hair that feels strong, smooth, and healthy.

the PEPTIDE PREP™ difference

Engineered for the most effective clean

got questions?

Get started here

When do I use the pH maintenance shampoo?

Engineered for higher frequency washing. Perfect for everyday use, especially if you have less buildup.

What makes the pH maintenance shampoo special?

This formula was engineered to create an optimal clean canvas without any fillers to coat or disrupt the hair and scalp equilibrium.

How does the pH maintenance shampoo work?

Plant-derived surfactants create high foaming + cleansing power without being harsh or leaving buildup behind on hair or scalp.

Why are the PEPTIDE PREP™ shampoos different?

Optimized with ideal pH for the hair + scalp environment, only 18 ingredients, no fillers, and the K18PEPTIDE™ to nourish hair while removing buildup, these shampoos are engineered to deliver a superior clean without stripping color or messing with hair + scalp balance. Whether you’re looking for an effective + gentle regular cleanse or a heavy-duty detox— these are the only 2 shampoos you need for every type of clean.

microbiome-friendly

Optimized pH preserves a balanced scalp microbiome + protects hair’s natural moisture levels for a smooth hair result.

reviews
average rating 4.3 out of 5
Based on 61 reviews
  • 5 Stars
    45 Reviews
  • 4 Stars
    5 Reviews
  • 3 Stars
    3 Reviews
  • 2 Stars
    2 Reviews
  • 1 Star
    6 Reviews
82% of reviewers would recommend this product to a friend
Customer photos and videos
61 Reviews
Reviewed by Robert S.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Tested on Family

I bought the shampoo for 3 of my family members, and they all LOOOVE it! Another great product!!!

Loading...
Was this helpful?

K18Hair

Thank you for your review and for spreading the K18 love Robert!

Reviewed by Stephanie D.
Verified Buyer
I recommend this product
Age
65+
Hair Concern
  • Color-care
  • Dryness
Hair Type
  • Fine/Thin
My Results
  • Less Frizz
  • Soft Touchable Hair
Rated 4 out of 5
Review posted

Great Producy

Very Happy with this shampoo, hard to knot if it’s working but my. Hair feels great!

Loading...
Was this helpful?

K18Hair

Thank you for your review Stephanie!

Reviewed by Margaret H.
Verified Buyer
I recommend this product
Age
65+
Hair Concern
  • Chemical damage
  • Heat damage
  • Color-care
  • Dryness
Hair Type
  • Medium Density
My Results
  • Bouncy Hair
  • Visible Difference
  • Shinier Hair
  • Smoother Hair
  • Soft Touchable Hair
Rated 5 out of 5
Review posted

Shampoo

I was surprised at the amount of suds I got. Actually, my scalp felt so much better after using this product.

I have tried many shampoos but this one is the best.!

Loading...
Was this helpful?

K18Hair

Thank you for your review Margaret!

Reviewed by Shannon T.
Verified Buyer
I recommend this product
Age
25 - 34
Hair Concern
  • Fragile/brittle hair
  • Dryness
  • Split-Ends
Hair Type
  • Medium Density
  • Straight/Wavy
My Results
  • Stronger Hair
  • Less Breakage
  • Defined Curl/Wave Pattern
  • Less Frizz
  • Soft Touchable Hair
Rated 5 out of 5
Review posted

Amazing!!!

So I was skeptical at first but I've used the product 3 times already along with the leave in mask and my hair feels wonderful. Feels like I've just left the salon everytime after it dries!! I have hard water and my hair is normally always splitting and breaking but I haven't noticed my hair doing that and I'm so thankful!!

Loading...
Was this helpful?

K18Hair

Thank you for your review Shannon!

Reviewed by Kaileen C.
Verified Buyer
I recommend this product
Age
25 - 34
Hair Concern
  • Color-care
  • Frizz
Hair Type
  • Curly/Coily
My Results
  • Defined Curl/Wave Pattern
  • Less Frizz
  • Smoother Hair
  • Shinier Hair
  • Bouncy Hair
Rated 5 out of 5
Review posted

LOVE THIS!!

My hair feels clean without being dried!

Loading...
Was this helpful?

K18Hair

Thank you for your review Kaileen.

recommended products

Mini Leave-In Molecular Repair Hair Mask 15 mLMini Leave-In Molecular Repair Hair Mask 15 mL
mini leave-in molecular repair hair mask
Rated 4.6 out of 5
Based on 6479 reviews
4-minute leave-in treatment to reverse hair damage
View Mini Leave-In Molecular Repair Hair Mask 15 mL product
PEPTIDE PREP™ detox shampoo 8.5ozPEPTIDE PREP™ detox shampoo 8.5oz
PEPTIDE PREP™ detox shampoo
Rated 4.6 out of 5
Based on 52 reviews
Color-safe, non-stripping clarifying shampoo with the K18PEPTIDE™
View Mini Leave-In Molecular Repair Hair Mask 15 mL product
Pro Distribution Partners

Paramount Beauty Supply
USA
Salon Services Pro
USA
Salon Service Group
USA
Salonwax Pro
USA
Premier Beauty Supply
USA
Launching Soon
Ozdare - Australia
AU
 
Launching Soon
American Crew Ltd. - New Zealand
NZ
 
Launching Soon
PlayGround - Hong Kong
HK
 
Launching Soon
Session Map - Sweden
SE
 
Launching Soon
Cyprus
CY
 
Launching Soon
Belgium
BE
 
Coming Early 2021
Canada
CA
 
Coming Early 2021
Czech Republic
CZ
 
Coming Early 2021
Finland
FI
 
Coming Early 2021
France
FR
 
Coming Early 2021
Germany
DE
 
Coming Early 2021
Ireland
IR
 
Coming Early 2021
Italy
IT
 
Coming Early 2021
Netherlands
NL
 
Coming Early 2021
Norway
NO
 
Coming Early 2021
Singapore
SG
 
Coming Early 2021
Taiwan
TW
 
Coming Early 2021
UK
UK
 
Coming Early 2021
thank you for visiting!

You are now being redirected to an official partner website for this region where you can shop K18 Hair.

Changed your mind? Go back.

00:00
Blackfire Tracking
subscribe + save 15%
healthy hair on your schedule
Pick your K18 + how often you want to replen.
We’ll send you a heads up before every delivery.
You’re in charge. Change the way you pay, skip a shipment, or cancel anytime.