Training Example: K18 Hair – Review the Data, Give Your Score & Compare to the Real AI Evaluation

SHOP NOWNEW
[H2]
TripleBright oxidation defense purple shampoo

Brighter, longer-lasting blonde—powered by breakthrough K18 triple-action technology.

SHOP NOW

your healthiest hair starts here

new

TripleBright oxidation defense purple shampoo

4.9 Rated 4.9 out of 5 stars297 Reviews

Breakthrough triple-action protection for brighter, longer-lasting blonde

Add To Bag
- $39

bestseller

jumbo leave-in molecular repair hair mask

4.7 Rated 4.7 out of 5 stars8,973 Reviews

4-minute leave-in treatment to reverse hair damage - now in an exclusive jumbo size

Please select a size

Full Size
- 50 mL
$75.00

Mini Size
- 15 mL

$29.00

Jumbo Size
- 100 mL

$120.00

Limited-Edition Scent
- 50 mL

$75.00

Add To Bag -
$120

new

Jumbo DAMAGE SHIELD pH protective shampoo

4.8 Rated 4.8 out of 5 stars493 Reviews

Color-safe protective shampoo maintains hair health + strength - now in a jumbo size

Please select a size

Full Size
- 8.5 oz
$39.00

Mini Size
- 1.8 oz

$14.00

Jumbo Size
- 16 oz

$59.00

Add To Bag -
$59

new

Jumbo PEPTIDE PREP™ detox shampoo

4.9 Rated 4.9 out of 5 stars639 Reviews

A color-safe, non-stripping clarifying shampoo - now in a jumbo size

Please select a size

Full Size
- 8.5 oz
$39.00

Mini Size
- 1.8 oz

$14.00

Jumbo Size
- 16 oz

$59.00

Add To Bag -
$59

new

Jumbo DAMAGE SHIELD protective conditioner

4.8 Rated 4.8 out of 5 stars622 Reviews

Color-safe protective conditioner maintains hair health + strength - now in a jumbo size

Please select a size

Full Size
- 8.5 oz
$39.00

Mini Size
- 1.8 oz

$14.00

Jumbo Size
- 16 oz

$59.00

Add To Bag -
$59

bestseller

full-size leave-in molecular repair hair mask

4.7 Rated 4.7 out of 5 stars5,558 Reviews

4-minute leave-in treatment to reverse hair damage

Please select a size

Full Size
- 50 mL
$75.00

Mini Size
- 15 mL

$29.00

Jumbo Size
- 100 mL

$120.00

Limited-Edition Scent
- 50 mL

$75.00

Add To Bag -
$75

bestseller

HeatBounce conditioning heat protectant

4.8 Rated 4.8 out of 5 stars514 Reviews

The future of heat protection

Please select a size

Full size
- 4 oz
$48.00

Mini size
- 1.6oz

$24.00

Add To Bag -
$48

AstroLift™ reparative volume spray

4.6 Rated 4.6 out of 5 stars418 Reviews

Interdimensional biotech reverses bounce-depleting damage for 2-day hold

Please select a size

Full size
- 4 oz
$46.00

Mini size
- 1.6 oz

$22.00

Add To Bag -
$46

bestseller

AirWash™ dry shampoo

4.7 Rated 4.7 out of 5 stars631 Reviews

Revolutionary dry shampoo for a fresh hair + scalp—even after your toughest workout

Please select a size

Full Size
- 4 oz
$48.00

Travel Size
- 1.6 oz

$24.00

Add To Bag -
$48

K18 molecular repair hair oil

4.8 Rated 4.8 out of 5 stars992 Reviews

Weightless oil that strengthens, repairs damage + reduces frizz

Add To Bag
- $65

DAMAGE SHIELD protective conditioner

4.8 Rated 4.8 out of 5 stars622 Reviews

Color-safe protective conditioner maintains hair health + strength

Please select a size

Full Size
- 8.5 oz
$39.00

Mini Size
- 1.8 oz

$14.00

Jumbo Size
- 16 oz

$59.00

Add To Bag -
$39

DAMAGE SHIELD pH protective shampoo

4.8 Rated 4.8 out of 5 stars493 Reviews

Color-safe protective shampoo maintains hair health + strength

Please select a size

Full Size
- 8.5 oz
$39.00

Mini Size
- 1.8 oz

$14.00

Jumbo Size
- 16 oz

$59.00

Add To Bag -
$39

PEPTIDE PREP™ detox shampoo

4.9 Rated 4.9 out of 5 stars639 Reviews

Color-safe, non-stripping clarifying shampoo with the K18PEPTIDE™

Please select a size

Full Size
- 8.5 oz
$39.00

Mini Size
- 1.8 oz

$14.00

Jumbo Size
- 16 oz

$59.00

Add To Bag -
$39

real people, real results
see more #k18results

[IMG: before]

[IMG: after]

before

after

"I absolutely love this product!! You have to see it to believe it!"
- Christina Marie P.

full-size leave-in molecular repair hair mask
Add To Bag -
$75

learn more

[IMG: before]

[IMG: after]

before

after

"Amazing the way it feels and the shine provides to the hair instantly." - Sandra M.

full-size leave-in molecular repair hair mask
Add To Bag -
$75

learn more

[IMG: before]

[IMG: after]

before

after

"I’ve been using this mask for about four washes so far. I feel that my hair is getting healthier." - Olga S.

full-size leave-in molecular repair hair mask
Add To Bag -
$75

learn more

[IMG: before]

[IMG: after]

before

after

“…I had my hair chopped (it was begging for it) along with some highlights and coloring of the roots. My hair stylist used this on my hair and I absolutely loved how it made my hair feel ... I love this mask so much!” - Ashley P.

full-size leave-in molecular repair hair mask
Add To Bag -
$75

learn more

[IMG: before]

[IMG: after]

before

after

"It makes my hair so soft and weightless, I absolutely love it. Most of the product leave my hair greasy and I can’t even style it, and right after washing I have to put it in the bun. It’s a nightmare! But not with k-18. Makes my hair feel so luxurious, it’s like I just left the salon. Can’t recommend this product more!" Anastasiia T.

full-size leave-in molecular repair hair mask
Add To Bag -
$75

learn more

[IMG: before]

[IMG: after]

before

after

"I normally don't use hair oils as my hair gets naturally oily....I loved the end result! I will officially be adding this hair oil to my routine" - Fabiola N.

K18 molecular repair hair oil
Add To Bag -
$65

learn more

[IMG: before]

[IMG: after]

before

after

"My hair has been a mess for years... My new hair stylist recommended K18! ... My hair looks and feels amazing with lasting results!!"
- Arnell M

full-size leave-in molecular repair hair mask
Add To Bag -
$75

learn more

[IMG: before]

[IMG: after]

before

after

"My hair was thin and unhealthy after years of highlights . After a few months of using the leave in mask, my hair is healthy and so much fuller." - Melissa K.

full-size leave-in molecular repair hair mask
Add To Bag -
$75

learn more

[IMG: before]

[IMG: after]

before

after

"I recently heavily highlighted my hair to match the salt and pepper I started growing out months prior. The first time I washed my hair it was so dry and damaged looking. The next wash was using K18 and the difference was evident! My hair looks healthy and silky again." - Mandy R.

full-size leave-in molecular repair hair mask
Add To Bag -
$75

learn more

[IMG: before]

[IMG: after]

before

after

"...My hair dresser introduced me to this and I have been using it ever since! The visible difference this made with my hair...was absolutely breathtaking. Will not go back to another shampoo ever!" - Hannah K.

DAMAGE SHIELD pH protective shampoo
Add To Bag -
$39

learn more

[IMG: before]

[IMG: after]

before

after

"I use this alllll the time. It's truly saved my hair....And it's so gorgeous and shiny and the thickness is returning nicely." - Emma L.

K18 molecular repair hair oil
Add To Bag -
$65

learn more

[IMG: before]

[IMG: after]

before

after

"I really like it, I was able to tint my hair again and it looks a little more thicker." - Estefania M.

DAMAGE SHIELD pH protective shampoo
Add To Bag -
$39

learn more

[IMG: before]

[IMG: after]

before

after

"Hair was so dry and like straw before using, and it is now so much softer, silkier and smoother."
- Angelo A

full-size leave-in molecular repair hair mask
Add To Bag -
$75

learn more

[IMG: before]

[IMG: after]

before

after

"One of the best dry shampoo out there. Feel in love with it right away." - Tiara N.

AirWash™ dry shampoo
Add To Bag -
$48

learn more

see the K18 difference

LEARN MORE
inspired by nature, designed for you

[H4] Using synthetic biology + biomimetics,
[H4] we solve hair concerns from the inside out.

LEARN MORE

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: Leave-in molecular repair hair mask 50mL]

[IMG: Leave-in molecular repair hair mask 50mL]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: Red curly hair before and after results using k18.]

[IMG: Grey curly hair before and after results using k18.]

[IMG: Bleach blonde hair before and after results using k18.]

[IMG: Red curly hair before and after results using k18.]

[IMG: get stronger, more resilient hair. left - 8x bleach without K18, right 8x bleach with K18]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: the K18 routine]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: less is more]

[IMG: works for all hair types]

[IMG: where does K18 fit into your routine?]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: K18 routine guide]

[IMG: Leave-in molecular repair hair mask 50mL]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: Red curly hair before and after results using k18.]

[IMG: Grey curly hair before and after results using k18.]

[IMG: Bleach blonde hair before and after results using k18.]

[IMG: Red curly hair before and after results using k18.]

[IMG: get stronger, more resilient hair. left - 8x bleach without K18, right 8x bleach with K18]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: the K18 routine]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: less is more]

[IMG: works for all hair types]

[IMG: where does K18 fit into your routine?]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: K18 routine guide]

tilebestseller | color:black
4.7 Rated 4.7 out of 5 stars5,558 Reviews

[H1] full-size leave-in molecular repair hair mask
4-minute leave-in treatment to reverse hair damage

Full Size
- 50 mL
$75.00

Mini Size
- 15 mL

$29.00

Jumbo Size
- 100 mL

$120.00

Limited-Edition Scent
- 50 mL

$75.00

pairs well with

limited edition

K18 x Future Society leave-in molecular hair mask

4.9 Rated 4.9 out of 5 stars82 Reviews
Bestselling mask scented with Floating Forest biotech fragrance

Add To Bag
- $75

K18 molecular repair hair oil

4.8 Rated 4.8 out of 5 stars992 Reviews
Weightless oil that strengthens, repairs damage + reduces frizz

Add To Bag
- $65

[H2] Description

A leave-in treatment mask that works on the molecular level to reverse hair damage in just 4 minutes. The K18PEPTIDE™ is clinically proven to repair damage from bleach + color, chemical services and heat* – with immediate and lasting results to restore strength, softness, smoothness and bounce to hair.
20+ billion TikTok views ?
*Disclaimers

[IMG: Leave-in molecular repair hair mask 50mL]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: Red curly hair before and after results using k18.]

[IMG: Grey curly hair before and after results using k18.]

[IMG: Bleach blonde hair before and after results using k18.]

[IMG: Red curly hair before and after results using k18.]

[IMG: get stronger, more resilient hair. left - 8x bleach without K18, right 8x bleach with K18]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: the K18 routine]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: less is more]

[IMG: works for all hair types]

[IMG: where does K18 fit into your routine?]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]

[IMG: K18 routine guide]

[IMG: leave-in-molecular-repair-hair-mask-50ml]

[IMG: full-size-leave-in-molecular-repair-hair-mask-50ml]

[IMG: red-curly-hair-before-and-after-results-using-k18]

[IMG: grey-curly-hair-before-and-after-results-using-k18]

[IMG: bleach-blonde-hair-before-and-after-results-using-k18]

[IMG: red-curly-hair-before-and-after-results-using-k18]

[IMG: get-stronger-more-resilient-hair-left-8x-bleach-without-k18-right-8x-bleach-with-k18]

[IMG: full-size-leave-in-molecular-repair-hair-mask-50ml]

[IMG: the-k18-routine]

[IMG: full-size-leave-in-molecular-repair-hair-mask-50ml]

[IMG: less-is-more]

[IMG: works-for-all-hair-types]

[IMG: where-does-k18-fit-into-your-routine]

[IMG: full-size-leave-in-molecular-repair-hair-mask-50ml]

[IMG: full-size-leave-in-molecular-repair-hair-mask-50ml]

[IMG: k18-routine-guide]

got questions?

Get started here.

how does the k18 mask work?

The K18 mask works as a treatment to reverse damage in 4 minutes. It’s powered by our biomimetic K18PEPTIDE™ to seamlessly fit in and reconnect broken polypeptide chains at the molecular level. As a result, disulfide bonds are also reconnected for reinforced strength along the length + width of hair—offering comprehensive, lasting, and progressive repair.

what is the k18peptide™?

K18PEPTIDE™ is a biotech-developed peptide that mimics hair’s structure to reverse damage by reconnecting polypeptide chains and disulfide bonds broken during damage from bleach + color, chemical services, and heat*
*Disclaimers

why skip conditioner?

Conditioner leaves a film that blocks our peptide from penetrating effectively. Once the 4-minute wait time is up, feel free to use a conditioner, a leave-in, or any type of product.

i noticed there’s alcohol in the formula, isn’t that bad for you?

We like to keep our formulas minimal, only using the exact amount of ingredients needed to get the peptide where it needs to go. Here the alcohol serves as an agent to optimize the hair environment for the K18 mask to work on a deeper level. Our unique blend of 3 alcohols functions to open the hair cuticle so the K18PEPTIDE™ can penetrate the innermost layer of hair, reaching the broken polypeptide chains (keratin chains).

when should i expect to see results?

Most see results after 2-3 uses. The more damaged the hair, the more dramatic the results so it may vary depending on your hair type and level of damage.

soft, strong, bouncy hair for everyone
Repair damage for hair like new* in 4 minutes.

[IMG: before]

[IMG: after]

before

after

"I absolutely love this product!! You have to see it to believe it!"
- Christina Marie P.

[IMG: before]

[IMG: after]

before

after

“…I had my hair chopped (it was begging for it) along with some highlights and coloring of the roots. My hair stylist used this on my hair and I absolutely loved how it made my hair feel ... I love this mask so much!” - Ashley P.

[IMG: before]

[IMG: after]

before

after

"Amazing the way it feels and the shine provides to the hair instantly." - Sandra M.

[IMG: before]

[IMG: after]

before

after

"I’ve been using this mask for about four washes so far. I feel that my hair is getting healthier." - Olga S.

[IMG: before]

[IMG: after]

before

after

"It makes my hair so soft and weightless, I absolutely love it... Makes my hair feel so luxurious, it’s like I just left the salon. Can’t recommend this product more!" Anastasiia T.

[IMG: before]

[IMG: after]

before

after

"My hair has been a mess for years... My new hair stylist recommended K18! ... My hair looks and feels amazing with lasting results!!"
- Arnell M

[IMG: before]

[IMG: after]

before

after

"I have heat damaged color treated curly hair and this has improved my hair health immensely...This is one of those products that has incorporated itself into my routine for the rest of my life..." - Siria A.

EXPLORE THE SCIENCE
[H1]
powered by K18PEPTIDE™

Biomimetic peptide clicks into hair’s keratin structure—the source of core strength—for soft, shiny, bouncy results that won’t wash away.

EXPLORE THE SCIENCE

how to use molecular repair mask
1. Shampoo, do not condition. Towel-dry thoroughly.
2. Apply 1-3 pumps based on your length and density, starting at the ends and working up towards the roots.
3. Let sit for 4 minutes. Do not rinse out.
4. Comb, add styling product + style as usual. Use for 4-6 washes, then as needed.
*k18hair.com/disclaimers

learn more on our blog

[IMG: How much leave-in mask do you *really* need?]

[H2] How much leave-in mask do you *really* need?

Find your optimal dose with this easy guide.

[IMG: The Science Behind K18 Molecular Repair]

[H2] The Science Behind K18 Molecular Repair

See how our K18PEPTIDE™-powered mask reverses damage in 4 minutes for lasting + progressive hair health.

[IMG: The Top K18 Mask FAQs]

[H2] The Top K18 Mask FAQs

answering your most-asked questions.

[IMG: molecular repair for curly + coily hair]

[H2] molecular repair for curly + coily hair

looking to restore your natural curl pattern? you need K18.

[IMG: molecular repair for aging hair]

[H2] molecular repair for aging hair

Hair evolves with age. This is how to support your strands throughout the years.

feel what's possible with K18

See how K18 unlocks our community's expression

Filters Write a Review (Opens in a new window) 5,558 reviews Sort Christy H. Verified Buyer
[IMG: HeatBounce conditioning heat protectant 4oz]
Reviewing HeatBounce conditioning heat protectant 4oz I recommend this product Age 35 - 44 Hair Concern Chemical damage, Heat damage, Color-care, Dryness, Fragile/brittle hair Hair Type Fine/Thin My Results Visible Difference, Stronger Hair, Smoother Hair, Shinier Hair, Cleaner, fresher hairRated 5 out of 5 stars1 week agoGreat heat protectantI use this now after every wash to protect before styling. Works wonders and I can tell it is protecting my hair because my hair strength is improving. Read MoreRead more about this review
[IMG: Long straight blonde hair with highlights and lowlights]
[IMG: Long straight blonde hair with highlights and lowlights]
K
[IMG: Profile picture for K18Hair]
K18Hair 1 week ago Thank you so much for this amazing review, Christy! We're absolutely thrilled to hear that you love the HeatBounce conditioning heat protectant and that you're using it after every wash! It's wonderful that you can feel it protecting your hair and that your hair strength is actually improving - that's exactly what we love to hear about our heat protection! We're so excited that you're experiencing such fantastic results and thanks for your incredible 5-star review! ?Read MoreRead more about this review reply Mary S. Verified Buyer
[IMG: Full-Size Leave-In Molecular Repair Hair Mask 50mL]
Reviewing Full-Size Leave-In Molecular Repair Hair Mask 50mL I recommend this product Age 55 - 64 Hair Concern Chemical damage, Fragile/brittle hair, Frizz, Dryness, Extending time between washes Hair Type Curly/Coily, Grey Hair, Fine/Thin, Thick/Coarse My Results Less Frizz, Visible Difference, Stronger Hair, Less Breakage, Defined Curl/Wave PatternRated 5 out of 5 stars1 week agoSaved my hair!!I have curly heavily highlighted hair blended with corse gray curls coming in. Such a mix! And Curly hair alone is a bit fragile I also swim laps in a saltwater pool and have a hot tub I use often. I use K18 as on not the biggest mainstays in hair routine.Read MoreRead more about this review
[IMG: Black and white portrait of a woman with curly blonde hair wearing glasses, with her hand near her head, against a textured background]
[IMG: Woman with curly blonde hair and glasses smiling at camera while making hand gestures]
[IMG: Black and white portrait of a woman with curly blonde hair wearing glasses, with her hand near her head, against a textured background]
[IMG: Woman with curly blonde hair and glasses smiling at camera while making hand gestures]
K
[IMG: Profile picture for K18Hair]
K18Hair 1 week ago Thank you so much for this incredible review, Mary! We're absolutely thrilled to hear that K18 has saved your hair - that's exactly what we love to hear! It's wonderful that the Full-Size Leave-In Molecular Repair Hair Mask is working so beautifully for your curly, highlighted hair with those gorgeous gray curls coming in. We understand how challenging it can be to maintain healthy hair with swimming in saltwater pools and hot tub use, so we're so excited that K18 has become one of your biggest mainstays in your hair routine! Thanks for your amazing 5-star review! ?Read MoreRead more about this review reply Danielle D. Verified Buyer
[IMG: Damaged Hair Rescue Set]
Reviewing Damaged Hair Rescue Set I recommend this product Age 35 - 44 Hair Concern Heat damage, Chemical damage, Frizz Hair Type Thick/Coarse, Curly/Coily My Results Less Frizz, Smoother Hair, Soft Touchable Hair, Cleaner, fresher hair, Bouncy HairRated 4 out of 5 stars1 week agoDo it.. worth trying outMy hair feels ridiculously good. Have used the mask before - but the prep shampoo and heat protectant are both new to me. Was surprised at how clean my hair felt after the shampoo. And really enjoyed both the scent and softness left after the heat protectant. Curious to see any long term benefits. Wish the price was a bit lower - as I'd love to use K18 products all the time, and not just as a once in a while luxury.. but not able to with

[H1] connect. earn. grow.

Welcome to the new K18 community on TYB (Try Your Best)—where healthy hair is even more rewarding.

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how it works
Earn K18 coins when you complete challenges, leave reviews + refer friends to unlock:
Discounts on the products you love*
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Surprise giveaways
Limited-edition drops + more

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Join the biotech breakthrough lab and let’s make the impossible possible, together.

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*Maximum discount of $25 for tier 1, $41 for tier 2, and $57 for tier 3. Must have at least $67 in your cart to apply coins. Must spend at least $11 after coin discounts are applied.

[IMG: DAMAGE SHIELD protective shampoo 8.5oz]

[IMG: DAMAGE SHIELD protective shampoo 8.5oz]

[IMG: DAMAGE SHIELD protective shampoo 8.5oz]

[IMG: DAMAGE SHIELD protective shampoo 8.5oz]

[IMG: DAMAGE SHIELD protective shampoo 8.5oz]

[IMG: DAMAGE SHIELD protective shampoo 8.5oz]

[IMG: DAMAGE SHIELD protective shampoo 8.5oz]

[IMG: DAMAGE SHIELD protective shampoo 8.5oz]

[IMG: DAMAGE SHIELD protective shampoo 8.5oz]

[IMG: A bottle of DAMAGE SHIELD protective shampoo by K18, with a white and blue label, indicating the size of 8.5 fl oz.]

[IMG: A bottle of DAMAGE SHIELD protective shampoo by K18, with a white and blue label, indicating the size of 8.5 fl oz.]

[IMG: DAMAGE SHIELD protective shampoo 8.5oz]

[IMG: K18 healthy hair routines- treatment day routine: to repair damage daily routine: to protect against daily damage]

[IMG: new name same formula pH maintenance shampoo formula]

[IMG: cleanse for frequent everyday washing]

[IMG: protect against dullness, frizz + tangling]

[IMG: DAMAGE SHIELD protective conditioner 8.5oz]

[IMG: Mini versus full size product comparison]

[IMG: K18 routine guide]

[IMG: A bottle of DAMAGE SHIELD protective shampoo by K18, with a white and blue label, indicating the size of 8.5 fl oz.]

[IMG: DAMAGE SHIELD protective shampoo 8.5oz]

[IMG: K18 healthy hair routines- treatment day routine: to repair damage daily routine: to protect against daily damage]

[IMG: new name same formula pH maintenance shampoo formula]

[IMG: cleanse for frequent everyday washing]

[IMG: protect against dullness, frizz + tangling]

[IMG: DAMAGE SHIELD protective conditioner 8.5oz]

[IMG: Mini versus full size product comparison]

[IMG: K18 routine guide]

4.8 Rated 4.8 out of 5 stars493 Reviews

[H1] DAMAGE SHIELD pH protective shampoo
Color-safe protective shampoo maintains hair health + strength

Full Size
- 8.5 oz
$39.00

Mini Size
- 1.8 oz

$14.00

Jumbo Size
- 16 oz

$59.00

pairs well with

bestseller

full-size leave-in molecular repair hair mask

4.7 Rated 4.7 out of 5 stars5,558 Reviews
4-minute leave-in treatment to reverse hair damage

Add To Bag
- $75

DAMAGE SHIELD protective conditioner

4.8 Rated 4.8 out of 5 stars622 Reviews
Color-safe protective conditioner maintains hair health + strength

Add To Bag
- $39

[H2] Description

A color-safe, pH-optimized shampoo with the patented K18PEPTIDE™ to effectively cleanse while maintaining hair health and protecting hair from damage. pH-optimized formula helps reduce excess swelling of the hair cuticle during washing to help prevent frizz, preserve color, and enhance shine. Scalp microbiome-friendly and gentle enough to use every time you cleanse.

[IMG: A bottle of DAMAGE SHIELD protective shampoo by K18, with a white and blue label, indicating the size of 8.5 fl oz.]

[IMG: DAMAGE SHIELD protective shampoo 8.5oz]

[IMG: K18 healthy hair routines- treatment day routine: to repair damage daily routine: to protect against daily damage]

[IMG: new name same formula pH maintenance shampoo formula]

[IMG: cleanse for frequent everyday washing]

[IMG: protect against dullness, frizz + tangling]

[IMG: DAMAGE SHIELD protective conditioner 8.5oz]

[IMG: Mini versus full size product comparison]

[IMG: K18 routine guide]

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[IMG: damage-shield-protective-shampoo-8-5oz]

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[IMG: mini-versus-full-size-product-comparison]

[IMG: k18-routine-guide]

your protective shampoo questions, answered

Is the formula of the DAMAGE SHIELD pH protective shampoo different from the PEPTIDE PREP™ pH maintenance shampoo?

No, the formula of the DAMAGE SHIELD pH protective shampoo is not different from the PEPTIDE PREP™ pH maintenance shampoo. Just the name has changed, the formulation you know and love is the same.

What makes the DAMAGE SHIELD pH protective shampoo special?

The DAMAGE SHIELD pH protective shampoo delivers healthier hair and scalp after just one wash. Its optimized pH helps maintain the hair cuticle, preventing excess water from entering the hair, which can cause damage, dullness, frizz, and tangling. With this shampoo, your color is maintained, hair feels strong, healthy, looks smooth with less frizz, and is easier to style with less tangles. This formula moisturizes hair without weighing it down, and preserves the scalp microbiome for a healthier-feeling scalp and a gentler cleanse. Coupled with the DAMAGE SHIELD protective conditioner, these formulas shield your healthiest hair from daily damage.

When do I use the DAMAGE SHIELD pH protective shampoo?

This pH-balanced formula is gentle enough to use every time you cleanse, delivering healthier hair and scalp after just one wash.

Why do I need both shampoos?

You need both shampoos to deliver the most effective clean while maintaining your hair + scalp health. Detox shampoo is engineered for less frequent heavy-duty washing, and DAMAGE SHIELD pH protective shampoo (previously pH maintenance shampoo) is engineered for frequent washing.

smooth + shield all hair types
pH-optimized formula prevents frizz, dullness + tangles for everyone.

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before

after

"...My hair dresser introduced me to this and I have been using it ever since! The visible difference this made with my hair...was absolutely breathtaking. Will not go back to another shampoo ever!" - Hannah K.

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before

after

"I really like it, I was able to tint my hair again and it looks a little more thicker." - Estefania M.

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after

"I thought the shampoo really added to the performance of the rest of the products. I didn’t expect to see much of a difference but I really did...I have had so many people comment on how much better my hair looks." -Michelle F.

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before

after

"...It seems to be working, I do notice less damage and shedding"
- Olympia R.

clinically proven cleanse

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said hair looks healthier*

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said hair feels smoother*

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said hair doesn’t feel weighed down*

EXPLORE THE SCIENCE
Powered by K18PEPTIDE™

Biomimetic peptide helps reduce protein loss to help keep hair feeling healthy and strong.

EXPLORE THE SCIENCE

how to use
Safe to use every time you wash.
1. Massage into hair, focusing on scalp.
2. Thoroughly rinse.
3. Repeat as needed.
For best results, follow with DAMAGE SHIELD protective conditioner.

learn more on our blog

[IMG: Trichologist Angela Onuoha explains what causes daily hair damage]

[H2] Trichologist Angela Onuoha explains what causes daily hair damage

Trichologist Angela Onuoha breaks down what causes daily hair damage, and how these culprits cause hair breakage, frizz, and dull color. The soluti...

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[H2] FUNdamentals 38: Wait, what shampoo should I use?

Your guide to the perfect cleanse on wash day.

[IMG: FUNdamentals 23: Your Shampoo Questions, Answered.]

[H2] FUNdamentals 23: Your Shampoo Questions, Answered.

You know what's FUN-damental? When your product works. We'll be breaking down key info + recommendations to help you get the most out of K18.

A f...

[IMG: FUNdamentals 21: Our shampoos are color-safe, here’s how...]

[H2] FUNdamentals 21: Our shampoos are color-safe, here’s how...

You know what's fun? When your product works. We'll be breaking down key info + recommendations to help you get the most out of K18.

That fresh-o...

[IMG: FUNdamentals 20: Which shampoo do I use?]

[H2] FUNdamentals 20: Which shampoo do I use?

You know what's fun? When your product works. We'll be breaking down key info + recommendations to help you get the most out of K18.

Your hair go...

feel what's possible with K18

See how K18 unlocks our community's expression

Filters Write a Review (Opens in a new window) 493 reviews Sort izzy b. Verified Buyer
[IMG: DAMAGE SHIELD protective shampoo 8.5oz]
Reviewing DAMAGE SHIELD protective shampoo 8.5oz I recommend this product Age 18 - 24 Hair Concern Chemical damage, Heat damage, Split-Ends Hair Type Medium Density My Results Stronger Hair, Less Breakage, Smoother HairRated 5 out of 5 stars4 minutes agofixed my damaged hairtotally life changing for my hair!Read MoreRead more about this review
[IMG: Person with long brown hair sitting in a salon chair from behind]
[IMG: Person with long brown hair in white shirt overlooking city view from hillside]
[IMG: Person with long brown hair sitting in a salon chair from behind]
[IMG: Person with long brown hair in white shirt overlooking city view from hillside]
Leggette M. Verified Buyer
[IMG: mini DAMAGE SHIELD protective shampoo 1.8oz]
Reviewing mini DAMAGE SHIELD protective shampoo 1.8oz I recommend this product Age 45 - 54 Hair Concern Chemical damage, Heat damage, Frizz, Color-care Hair Type Thick/Coarse, Grey Hair, Curly/Coily My Results Shinier Hair, Smoother Hair, Visible DifferenceRated 5 out of 5 stars2 months agoI now love shampoo Going almost 50 years hating shampoo and seeing no value because it didn’t serve a purpose to my coarse curly hair because of k18 I’m experiencing a hair renaissance and now look forward to shampoo It’s just different and it has made my hair gorgeous Read MoreRead more about this review
[IMG: A person with blonde hair taking a selfie indoors]
[IMG: A woman with long brown hair smiling while lying down, wearing a red and black plaid shirt and white sweater]
[IMG: A person with blonde hair taking a selfie indoors]
[IMG: A woman with long brown hair smiling while lying down, wearing a red and black plaid shirt and white sweater]
K
[IMG: Profile picture for K18Hair]
K18Hair 2 months ago Thank you so much for your incredible review, Leggette! We're absolutely thrilled to hear that after almost 50 years of not enjoying shampoo, our mini DAMAGE SHIELD protective shampoo has completely transformed your hair experience and sparked a hair renaissance! There's no better compliment than knowing our formula is working so beautifully with your coarse curly hair that you're now actually looking forward to shampoo - that's amazing! We love that you're experiencing gorgeous results and finally finding value in a shampoo that truly serves your hair's needs. ❤️Read MoreRead more about this review reply Mrs. L.
[IMG: mini DAMAGE SHIELD protective shampoo 1.8oz]
Reviewing mini DAMAGE SHIELD protective shampoo 1.8oz I recommend this product Age 25 - 34 Hair Concern Chemical damage, Fragile/brittle hair, Split-Ends Hair Type Fine/Thin My Results Less BreakageRated 5 out of 5 stars3 months agoMini I purchased the mini size because it’s the first time I’m using this brand, and I wanted to see how well it worked for my hair before committing to a regular sized bottle. Because my hair is fine and on the shorter side, I’m able to get multiple uses from this product. And it smells amazing! I recommend itRead MoreRead more about this review
[IMG: K18 hair care products including damage shield shampoo, conditioner, and molecular repair hair oil displayed on a patterned rug]
[IMG: A colorful gradient packaging box for K18 hair treatment product, featuring a DNA helix design and the text]
[IMG: K18 hair care products including damage shield shampoo, conditioner, and molecular repair hair oil displayed on a patterned rug]
[IMG: A colorful gradient packaging box for K18 hair treatment product, featuring a DNA helix design and the text]
K
[IMG: Profile picture for K18Hair]
K18Hair 3 months ago Thank you so much for your incredible review, Mrs.! We're absolutely thrilled to hear that our mini DAMAGE SHIELD protective shampoo is working so beautifully for your fine hair and that you're getting multiple uses from the travel size - there's no better compliment than knowing our protective formula smells amazing and is delivering such great results that you'd recommend it to others! ❤️Read MoreRead more about this review reply Mrs. L.
[IMG: mini DAMAGE SHIELD protective shampoo 1.8oz]
Reviewing mini DAMAGE SHIELD protective shampoo 1.8oz I recommend this product Age 25 - 34 Hair Concern Chemical damage, Fragile/brittle hair, Dryness Hair Type Fine/Thin My Results Stronger HairRated 5 out of 5 stars3 months agoMini ShampooI purchased the mini just to see how it will work on my hair. I have relaxed, fine, brittle hair. This size is perfect for me. And it’s small enough to be TSA approved! I also enjoyed the marketing on the inside of the box! Read MoreRead more about this review
[IMG: K18 hair care products including damage shield shampoo, conditioner, and molecular repair hair oil displayed on a patterned rug]
[IMG: Colorful gradient packaging box for K18 hair treatment product with DNA helix design, displaying]
[IMG: K18 hair care products including damage shield shampoo, conditioner, and molecular repair hair oil displayed on a patterned rug]
[IMG: Colorful gradient packaging box for K18 hair treatment product with DNA helix design, displaying]
K
[IMG: Profile picture for K18Hair]
K18Hair 3 months ago Thank you so much for your incredible review, Mrs.! We're absolutely thrilled to hear that our mini DAMAGE SHIELD protective shampoo is the perfect size for you to try on your relaxed, fine hair - and we love that you're already thinking ahead for travel with that TSA-approved convenience! There's no better compliment than knowing you enjoyed our special packaging details too! ❤️Read MoreRead more about this review reply Linda G. Verified Buyer
[IMG: DAMAGE SHIELD protective shampoo 8.5oz]
Reviewing DAMAGE SHIELD protective shampoo 8.5oz I recommend this product Age 55 - 64 Hair Concern Chemical damage, Heat damage, Dryness, Frizz, Split-Ends Hair Type Thick/Coarse, Grey Hair, Curly/Coily My Results Less Frizz, Soft Touchable Hair, Visible Difference, Cl