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Jumbo DAMAGE SHIELD protective conditioner
Regular price $59
Regular price $0 Sale price $59
K18 conditioner bottle on a blue background
K18 hair care product lineup with mini, full, and jumbo sizes on a blue background
Jumbo DAMAGE SHIELD protective conditioner
Educational poster about hair care, showing a stylized image of hair and text explaining why hair needs protection.
Diagram of hair damage protection with text and molecular structure illustration on a blue background
K18 Damage Shield hair care product with text on a blue background
Person getting hair washed with a focus on hair care product benefits.
Hand holding a K18 hair product bottle with white conditioner being dispensed onto another hand against a blue background
K18 hair care products on a colorful background with text about healthy hair routines.
K18 hair care routine guide with steps for repair and maintenance.
K18 conditioner bottle on a blue background
K18 hair care product lineup with mini, full, and jumbo sizes on a blue background
Jumbo DAMAGE SHIELD protective conditioner
Educational poster about hair care, showing a stylized image of hair and text explaining why hair needs protection.
Diagram of hair damage protection with text and molecular structure illustration on a blue background
K18 Damage Shield hair care product with text on a blue background
Person getting hair washed with a focus on hair care product benefits.
Hand holding a K18 hair product bottle with white conditioner being dispensed onto another hand against a blue background
K18 hair care products on a colorful background with text about healthy hair routines.
K18 hair care routine guide with steps for repair and maintenance.
4.8
Rated 4.8 out of 5 stars
700 Reviews
new

Jumbo DAMAGE SHIELD protective conditioner

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

Size:
16oz
Regular price $59
Regular price $0 Sale price $59
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Color:
16oz

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K18 conditioner bottle on a blue background

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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

    • 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.
    • 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.
    • 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, Limonene, Citrus Aurantium Dulcis Flower Oil, Citrus Aurantium Peel Oil, Citrus Limon Peel Oil, Coumarin, Tetramethyl Acetyloctahydronaphthalenes.

pairs well with
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Press + and − keys to zoom, arrow keys to pan.
K18 conditioner bottle on a blue background
K18 hair care product lineup with mini, full, and jumbo sizes on a blue background
Jumbo DAMAGE SHIELD protective conditioner
Educational poster about hair care, showing a stylized image of hair and text explaining why hair needs protection.
Diagram of hair damage protection with text and molecular structure illustration on a blue background
K18 Damage Shield hair care product with text on a blue background
Person getting hair washed with a focus on hair care product benefits.
Hand holding a K18 hair product bottle with white conditioner being dispensed onto another hand against a blue background
K18 hair care products on a colorful background with text about healthy hair routines.
K18 hair care routine guide with steps for repair and maintenance.
K18 conditioner bottle on a blue background
K18 hair care product lineup with mini, full, and jumbo sizes on a blue background
Jumbo DAMAGE SHIELD protective conditioner
Educational poster about hair care, showing a stylized image of hair and text explaining why hair needs protection.
Diagram of hair damage protection with text and molecular structure illustration on a blue background
K18 Damage Shield hair care product with text on a blue background
Person getting hair washed with a focus on hair care product benefits.
Hand holding a K18 hair product bottle with white conditioner being dispensed onto another hand against a blue background
K18 hair care products on a colorful background with text about healthy hair routines.
K18 hair care routine guide with steps for repair and maintenance.
your protective conditioner questions, answered

still have questions? visit our help center

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

clinically proven protection
3
days of conditioning protection against damage from UV rays, mechanical styling + environmental aggressors*
94%
agreed hair didn’t feel weighed down*
91%
agreed hair felt softer*
Powered by biotech-produced polysaccharide

Acts as a biomimetic shield to protect hair BEFORE daily damage occurs—preventing damage, dullness + frizz.

Explore the Science Explore the Science
how to use damage shield conditioner

1. Apply a small amount of DAMAGE SHIELD protective conditioner from mid-lengths to ends and build as needed.
2. Thoroughly rinse.

For best results, use after shampooing with DAMAGE SHIELD shampoo.

learn more on our blog
Trichologist Angela Onuoha explains what causes daily hair damage
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FUNdamentals 02: Masks + conditioners vs. K18
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Myth Busting 04: Conditioners
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Myth Busting 04: Conditioners
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See how K18 unlocks our community's expression

4.8
Rated 4.8 out of 5 stars
Based on 700 reviews
96%would recommend these products
Reviews Summary
Customers say this shampoo and conditioner transforms their hair after just a few uses. Many reviews mention noticeable improvements in softness, shine, and manageability. Users with curly hair report better moisture retention and less frizz, while those with fine hair appreciate that it doesn't weigh their hair down. Frequent comments address how a small amount of product creates rich lather and goes a long way. Many note they can extend time between washes while maintaining clean, fresh-looking hair. Reviews highlight the products' effectiveness for detangling and creating smoother, more manageable results.
Customers Talked About
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700 reviews
  • Rebecca D.
    Verified Buyer
    Reviewing
    DAMAGE SHIELD shampoo and conditioner sample
    I recommend this product
    Rated 5 out of 5 stars
    1 year ago
    Tried the sample and immediately hit BUY!

    I’m rehabbing some over processed hair and also dealing with some fallout from surgeries in the fall. I ordered the treatment first and with it came these samples. One try and I had to buy!

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    Was this helpful?
    K Profile picture for K18Hair
    K18Hair
    1 year ago

    We are happy you enjoyed your sample! Thank you for your review!

  • Melissa B.
    Verified Buyer
    Reviewing
    mini DAMAGE SHIELD protective conditioner 1.8oz
    I recommend this product
    Age 35 - 44
    Hair Concern Chemical damage, Frizz, Fragile/brittle hair, Split-Ends, Dryness
    Hair Type Medium Density
    My Results Less Frizz, Visible Difference, Smoother Hair
    Rated 5 out of 5 stars
    1 year ago
    Amazing!

    Saw results in just over 2 weeks with this and other products I ordered! My daughter steals my products now too!!! Works great with her extensions!

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    K Profile picture for K18Hair
    K18Hair
    1 year ago

    Thank you Melissa! K18 works amazing with human hair extensions!

  • Christine Z.
    Verified Buyer
    Reviewing
    DAMAGE SHIELD shampoo and conditioner sample
    I recommend this product
    Rated 5 out of 5 stars
    1 year ago
    Miracle worker

    I've been bleaching my hair on and off for 20 years. I've spent more than I'd like to admit on products to smooth and treat my hair for all the damagei have from said bleach as well as all the heat i use on it. I have naturally wavy hair that is a bit poofy and frizzy. I straighten almost every time I wash. Nothing has ever worked like K18. After I put it in my hair, I blow dry and straighten as usual and my hair looks so incredibly smooth and healthy. This stuff is amazing. Well worth the price.

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    K Profile picture for K18Hair
    K18Hair
    1 year ago

    Thank you Christine! Smooth and Healthy feel amazing right?

  • Eddie H.
    Verified Buyer
    Reviewing
    DAMAGE SHIELD shampoo and conditioner sample
    I recommend this product
    Rated 5 out of 5 stars
    1 year ago
    WOW

    This shampoo and conditioner really made a difference in my hair. It looks smoother and healthier and brought back to life! I did one side with the k18, and the other with another luxury brand I use, and the results speak for themselves.

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    K Profile picture for K18Hair
    K18Hair
    1 year ago

    Wow what a noticeable change! Thank you for this!

  • Brandie B.
    Verified Buyer
    Reviewing
    DAMAGE SHIELD protective conditioner 8.5oz
    I recommend this product
    Age 35 - 44
    Hair Concern Chemical damage, Heat damage, Fragile/brittle hair, Dryness
    Hair Type Fine/Thin
    My Results Visible Difference, Stronger Hair, Less Breakage, Soft Touchable Hair
    Rated 5 out of 5 stars
    1 year ago
    Improved hair health and new growth

    My hair was fried after going lighter this summer. I’ve been using K18 products for about 4 months. I definitely have seen an improvement in the overall heath of my hair along with new growth in areas that were previously extensively damaged

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    Was this helpful?
    K Profile picture for K18Hair
    K18Hair
    1 year ago

    Thank you Brandie! Healthy and happy hair!

*Disclaimers

10