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DAMAGE SHIELD protective conditioner
Image of conditioner: protects hair from damage for up to 3 days*, weightlessly detangles hair, maintains hair health for all hair types, fortifies, softens + smooths, enhancers hairs natural shine, vegan, cruelty-free + plastic net zero
Image of conditioner: protects hair from 3 types of damage for up to 3 days*, environmental aggressors, UV rays, mechanical styling
Image of hair strand graphic: why hair needs a shield, damage happens every day from: uv rays, mechanical styling, environmental aggressors, damage happens at every level
Image of hair strand graphic: damage protection from the inside out, outside: ceramic blend + biotech-produced polysaccharide. Inside: K18PEPTIDETM
Image of K18 routine: K18 healthy hair routines, when you need to repair damage (detox shampoo + leave-in mask, when you need to protect against daily damage (pH shampoo + conditioner)
Image of models: shield you healthiest hair against daily damage
Image of model: weightlessly soften, smooth + detangle hair without film-forming silicones or waxes that can build up over time

DAMAGE SHIELD protective conditioner

Nourishing conditioner shields hair from daily damage
Rated 4.6 out of 5
Based on 148 reviews

A nourishing, protective conditioner that helps shield hair from daily damage to help maintain hair health and improve smoothness and shine. Engineered to weightlessly soften and detangle while the K18PEPTIDE™ helps replenish hair during washing.

protects from damage for up to 3 days from:

  • UV rays
  • mechanical styling
  • environmental aggressors
OR
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Clinically proven to provide conditioning protection against damage from UV rays, mechanical styling, and environmental aggressors for up to 3 days*. Fortifies, softens, and detangles hair.

  • Defends against damage: Conditioning protection against damage from UV rays, environmental aggressors, and daily mechanical styling for up to 3 days
  • Maintains hair health: Fortifies hair’s exterior lipid barriers to make hair more resilient and resistant to damage. K18PEPTIDE™ replenishes protein lost during washing.
  • Enhances hair’s natural shine: pH-optimized formula minimizes excess cuticle swelling during washing to help keep hair smooth and maximize shine.
  • Softens, smooths, and detangles: Without film-forming silicones or waxes that can build up over time and weigh hair down.

*Disclaimers

  • Biotech-Produced Polysaccharide acts as a biomimetic shield to protect hair against pollution and environmental aggressors
  • Fortifying Ceramide Blend seals damage sites in the hair cuticle—smoothing and protecting hair from further damage
  • K18PEPTIDE™ replenishes protein lost during washing

  1. Apply a small amount of DAMAGE SHIELD protective conditioner from mid-lengths to ends and build as needed.
  2. Rinse thoroughly.
  3. For best results, use after shampooing with DAMAGE SHIELD shampoo.

Water (Aqua) (Eau), Isopropyl Palmitate, Stearyl Alcohol, Propanediol, Isopentyldiol, Behentrimonium Chloride, Tocopherol, Tocopheryl Acetate, sh-Oligopeptide-78, Alteromonas Ferment Extract, Prunus Amygdalus Dulcis (Sweet Almond) Oil, Simmondsia Chinensis (Jojoba) Seed Oil, Phospholipids, Jojoba Esters, Calcium Gluconate, Hydroxypropyl Guar Hydroxypropyltrimonium Chloride, Ceramide NP, Phytosteryl/Isostearyl/Cetyl/Stearyl/Behenyl Dimer Dilinoleate, Polyquaternium-16, Stearalkonium Chloride, Isopropyl Alcohol, Butylene Glycol, Gluconolactone, Phenoxyethanol, Sodium Benzoate, Citric Acid, Sodium Hydroxide, Fragrance (Parfum), Hydroxycitronellal.

pairs well with

DAMAGE SHIELD pH protective shampoo

Rated 4.6 out of 5
Based on 286 reviews
Color-safe protective shampoo maintains hair health + strength

K18 molecular repair hair oil

Rated 4.7 out of 5
Based on 465 reviews
Weightless oil that strengthens, repairs damage + reduces frizz

Description

A nourishing, protective conditioner that helps shield hair from daily damage to help maintain hair health and improve smoothness and shine. Engineered to weightlessly soften and detangle while the K18PEPTIDE™ helps replenish hair during washing.

have questions?

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The mask and conditioner serve two different purposes. The K18 mask reverses damage in 4 minutes, while the K18 conditioner protects hair from daily damage for up to 3 days*. We recommend using the K18 mask first, waiting 4 minutes, then using conditioner for additional softening and detangling benefits between K18 mask days. *Disclaimers

No, the K18 conditioner will not cause buildup on hair. The highly concentrated, lightweight gel formula means a little goes a long way. Use less than you typically would with a traditional conditioner, and build as needed.

No, the K18 conditioner will not weigh hair down. This highly concentrated, lightweight gel formula softens, smooths, and detangles without film-forming silicones or waxes that can build up over time.

No, you do not need to reapply the K18 conditioner for continued UV protection. This product is clinically proven to protect hair against damage from UV rays for up to 3 days*. *Disclaimers

No, the K18 conditioner does not have SPF. The biotech-produced polysaccharide and fortifying ceramide blend help minimize the drying and damaging effects of UV rays on the hair's cuticle. This prevents hair from becoming rough, brittle, weak, and prone to breakage from UV damage for up to 3 days*. *Disclaimers

3-day damage protection, powered by biotech

why hair needs a shield

Damage happens every day from UV rays, mechanical styling, and environmental aggressors—weakening, dulling, and causing frizz on all hair types.

how the shield works

Protect hair BEFORE daily damage occurs. Our biology-first approach to haircare draws inspiration from nature’s resilience to harsh environments. Engineered into 3-day conditioning protection without the need to reapply.

expert-approved protection

Trichologist Angela Onuoha breaks down how common hair aggressors damage hair, and how DAMAGE SHIELD protects hair between K18 mask days.

all hair types need daily damage protection

Discover why PROs are recommending weightless conditioning protection to every client.

feel what's possible with K18

See how K18 unlocks our community's expression

reviews

average rating 4.6 out of 5
Based on 148 reviews
  • 5 Stars
    119 Reviews
  • 4 Stars
    14 Reviews
  • 3 Stars
    8 Reviews
  • 2 Stars
    2 Reviews
  • 1 Star
    5 Reviews
90% of reviewers would recommend this product to a friend
Customer photos and videos
148 Reviews
Reviewed by Joy B.
Verified Buyer
I recommend this product
Age
35 - 44
Client Hair Concerns
  • Dryness
  • Heat Damage
  • Split Ends
  • Chemical Damage
  • Fragile/Brittle Hair
Client Hair Types
  • Medium Density
Client Results
  • Less Frizz
  • Visible Difference
  • Smoother Hair
  • Soft Touchable Hair
  • Shinier Hair
Rated 5 out of 5
Review posted

Absolutely Fabulous !

As a licensed cosmetologist, not only do I recommend this product, but I also use it. It leaves hair feeling fresh, light, moisturized & healthy!

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K18Hair

Thank you for your trust with your clients and your hair! We appreciate your review!

Reviewed by Melissa
I recommend this product
Rated 5 out of 5
Review posted

5 Stars

Makes a total difference in my hair!!

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K18Hair

Thank you for your review!

Reviewed by Samantha H.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Loved

Made my scalp and hair feel super clean but not dry. Left hair soft an subtle

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K18Hair

Thank you for your review!

Reviewed by laura f.
Verified Buyer
I recommend this product
Age
55 - 64
Client Hair Concerns
  • Extending time between washes
  • Heat Damage
  • Split Ends
  • Dryness
  • Color Care
Client Hair Types
  • Medium Density
  • Thick/Coarse
  • Fine/Thin
  • Straight/Wavy
Client Results
  • Visible Difference
  • Cleaner, fresher hair
  • Stronger hair
  • Soft Touchable Hair
  • Shinier Hair
Rated 5 out of 5
Review posted

Perfect for regular conditioning

On days that I don’t use the K18 repair mask, this is my go to. I use this at my back bar on everyone who isn’t getting a color service. It leaves the hair smooth and shiny and I know I just added a layer of protection to go forward.

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K18Hair

Thank you Laura for your review!

Reviewed by Olga S.
Verified Buyer
I recommend this product
Age
55 - 64
Client Hair Concerns
  • Color Care
  • Chemical Damage
  • Oily hair/scalp
  • Dryness
  • Extending time between washes
Client Hair Types
  • Fine/Thin
  • Medium Density
  • Thick/Coarse
  • Straight/Wavy
  • Curly/Coily
Client Results
  • Less Frizz
  • Bouncy Hair
  • Less Breakage
  • Soft Touchable Hair
  • Shinier Hair
Rated 5 out of 5
Review posted

Love it

Love it

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K18Hair

We appreciate your review!

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