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

Grey curly hair before and after results using k18.

DAMAGE SHIELD protective conditioner 8.5oz

Red curly hair before and after results using k18.

Bleach blonde hair before and after results using k18.

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

Mini versus full size product comparison

4.7

Rated 4.7 out of 5 stars

334 Reviews

DAMAGE SHIELD protective conditioner

Name: DAMAGE SHIELD protective conditioner 8.5oz
Brand: K18Hair
SKU: K18-40055
Price: 36.00 USD
Availability: InStock
Rating: 4.7 (334 reviews)

Nourishing conditioner shields hair from daily damage

DAMAGE SHIELD protective conditioner 8.5oz $36.00

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

393 Reviews

Color-safe protective shampoo maintains hair health + strength

K18 molecular repair hair oil

4.8

Rated 4.8 out of 5 stars

749 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

4.7

Rated 4.7 out of 5 stars

Based on 334 reviews

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334 reviews

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Nepthali M.
Verified Buyer
Reviewing
DAMAGE SHIELD shampoo and conditioner sample
I recommend this product
Rated 5 out of 5 stars
Yesterday
Great product!
My hair got destroyed from the last hair appointment I had (over processed )🥺 i thought I'd never be able to save it and would have to cut it all off but this is my 3rd treatment with the leave in molecular repair hair mask and I can definitely tell a difference, I also got a few samples with my first order and I thought that was super awesome of this company to let people test other products . I now have the shampoo/conditioner and got the tall repair mask . I will be ordering the oil as well (my husband has been using the sample i got on his curly dry hair and he absolutely loves it )😆
Thanks k18 for making the best hair products, I've spent so much $ looking for the right stuff and I've finally found the one 🙌
Was this helpful?
K
K18Hair
Yesterday
We appreciate your review! Glad you found us!
magdalena p.
Verified Buyer
Reviewing
DAMAGE SHIELD shampoo and conditioner sample
I recommend this product
Rated 5 out of 5 stars
1 month ago
Hooked
Hooked for life! What a difference in my hair and styling time. Never going back to anything else. In 2020 I started going out my hair to natural gray surprisingly not all together gray but never the less hair dye was not working out for me. Gray hair for me is healthy but gray can also be hard to handle but K18 makes it easy.
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K
K18Hair
1 month ago
Healthy hair is the best feeling! Thank you Magdalena!
Libia F.
Verified Buyer
Reviewing
DAMAGE SHIELD shampoo and conditioner sample
I recommend this product
Rated 5 out of 5 stars
1 month ago
Love it. Use it for travels
I love the fact that I get this sample size so that I can take it with me for my travels. Even this little bit leaves my hair so nice and soft.
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K
K18Hair
1 month ago
The best for travel! Thank you Libia!
Brittany H.
Verified Buyer
Reviewing
DAMAGE SHIELD shampoo and conditioner sample
I recommend this product
Rated 5 out of 5 stars
1 month ago
Love!
I have washed my hair with this product 4x’s now and it’s made such a difference. My dry, damaged hair is feeling and looking healthier.
Was this helpful?
K
K18Hair
1 month ago
Thank you for your review!
SHERY W.
Verified Buyer
Reviewing
DAMAGE SHIELD shampoo and conditioner sample
I recommend this product
Rated 5 out of 5 stars
2 months ago
Great product
The best hair oil I've ever used
Was this helpful?
K
K18Hair
2 months ago
Thank you for your review!