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 8.5oz

4.6

Rated 4.6 out of 5 stars

252 Reviews

DAMAGE SHIELD protective conditioner

Name: DAMAGE SHIELD protective conditioner 8.5oz
Brand: K18Hair
SKU: K18-40055
Price: 36.00 USD
Availability: InStock
Rating: 4.6 (252 reviews)

Nourishing conditioner shields hair from daily damage

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.

protects from damage for up to 3 days from:

UV rays
mechanical styling
environmental aggressors

more to know

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

key benefits

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

how to use

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

ingredients

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

4.7

Rated 4.7 out of 5 stars

353 Reviews

Color-safe protective shampoo maintains hair health + strength

K18 molecular repair hair oil

4.7

Rated 4.7 out of 5 stars

639 Reviews

Weightless oil that strengthens, repairs damage + reduces frizz

Description

have questions?

Get started here

Can I use the conditioner instead of the mask?

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

Will the K18 conditioner cause buildup on hair?

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.

Will the K18 conditioner weigh hair down?

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.

Does the K18 conditioner need to be reapplied for continued UV protection?

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

Does the K18 conditioner have SPF?

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.

certified microbiome-friendly conditioning

Biology-first formula keeps your scalp microbiome in balance with 3-day conditioning damage protection.

feel what's possible with K18

See how K18 unlocks our community's expression

4.6

Rated 4.6 out of 5 stars

Based on 252 reviews

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252 reviews

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Jessi G.
Verified Buyer
Reviewing
DAMAGE SHIELD protective conditioner 8.5oz
I recommend this product
Age 25 - 34
Hair Concern Fragile/brittle hair, Chemical damage, Frizz
Hair Type Thick/Coarse
My Results Visible Difference, Stronger Hair, Less Breakage, Soft Touchable Hair, Smoother Hair
Rated 5 out of 5 stars
22 hours ago
Perfect for my thick, wavy hair with recent highlights
I have dark, thick wavy hair that I keep natural 95% of the time. I use no heat and do not dye it, and it loves lots of product like leave in conditioner or curl cream. After years of debating it, I decided to do a "halo" highlight. My hair dressed did a few sessions and tried to minimize damage, but the bleached under layer of my hair was struggling. It was coarse and brittle while having a gross stretchiness to it. My hair dresser reccomended K18 over Olaplex. I LOVE THIS STUFF. After one use I could feel the softness and manageability return to the bleached hair. I am now forever sold. Excited to try more products like the dry shampoo!
Was this helpful?
Lauren S.
Verified Buyer
Reviewing
DAMAGE SHIELD shampoo and conditioner sample
I recommend this product
Rated 5 out of 5 stars
5 days ago
My curls have never looked better!
I tried the damage shield shampoo and immediately loved it. My curls were bouncy and shiny! We have hard well water so I am always fighting mineral deposits on my hair but this shampoo did an amazing job combatting the hard water.
Was this helpful?
K
K18Hair
4 days ago
Thank you Lauren! Enjoy your healthy curls!
Kylee C.
Verified Buyer
Reviewing
DAMAGE SHIELD protective conditioner 8.5oz
I recommend this product
Age 25 - 34
Hair Concern Heat damage, Color-care, Frizz, Split-Ends, Oily hair/scalp
Hair Type Medium Density
My Results Less Frizz, Stronger Hair, Less Breakage, Smoother Hair, Cleaner, fresher hair
Rated 5 out of 5 stars
2 weeks ago
I love this whole set!
Perfect for color treated hair
Was this helpful?
K
K18Hair
2 weeks ago
Thank you Kylee! We appreciate your 5-star review!
Michele H.
Verified Buyer
Reviewing
DAMAGE SHIELD shampoo and conditioner sample
I recommend this product
Rated 5 out of 5 stars
4 weeks ago
Loving my hair
I have thin baby soft hair never holds a curl. Damage Shield shampoo and conditioner hold the curl made my hair soft and shinny with out going flat. I love it.
Was this helpful?
K
K18Hair
3 weeks ago
Thank you Michele! Enjoy your soft and shiny hair!
Taylor R.
Verified Buyer
Reviewing
DAMAGE SHIELD protective conditioner 8.5oz
I recommend this product
Age 25 - 34
Hair Concern Split-Ends, Frizz, Dryness
Hair Type Fine/Thin, Medium Density, Curly/Coily
My Results Visible Difference, Defined Curl/Wave Pattern, Stronger Hair, Less Frizz, Bouncy Hair
Rated 5 out of 5 stars
1 month ago
Visible improvements!
Ever since I started trying to be natural and use natural ingredients my hair hasn’t been really retaining moisture, or looking its best.
I’m also cheap, I never was one to invest in products.
I tried olaplex and didn’t really see any significant improvement in my hair condition, I kept up with trims but my hair still looked weak and damaged. I wasn’t retaining length & my split ends came faster than I could clip them.
I switched to K18 in April, and I love this stuff!!
My hair retention has improved, my hair stays hydrated, I can go longer in between trims. My curls are beautiful and bouncy.
I ended up running out of product for a month and I noticed the difference. It’s def worth the price!
Was this helpful?
K
K18Hair
1 month ago
Thank you Taylor! We appreciate your review! Enjoy your hydrated curls!

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