Accessibility statement Skip to content
free returns. buy with confidence
free shipping on qualifying orders*
how to use K18

Your guide to getting the most from biotech-powered haircare.
How to use TripleBright Oxidation Defense Purple Shampoo?

removes metals + minerals

defends against future brassiness

1. Apply throughout sectioned hair, brushing through to help with even distribution.

2. Use on towel-dried hair before blow drying and on dry hair before hot tools.

What is TripleBright?

The first triple-action purple shampoo to remove metals + minerals, neutralize existing brass, and defend against future brassiness for blonde like new, hair like new*.


*k18hair.com/disclaimers
what is Heatbounce conditioning heat protectant?

Powered by patented resilicore™ heat-shielding technology, HeatBounce preserves color + shine from hair’s cuticle to cortex*—the deepest level of hair. Lightweight conditioning blend creates a smooth, detangled base for easy, healthy heat styles.

how to use Heatbounce

1. Apply throughout sectioned hair, brushing through to help with even distribution.

2. Use on towel-dried hair before blow drying and on dry hair before hot tools.
how to use AstroLift™ reparative volume spray

volumize

repair damage

SHAKE WELL. Can be applied to dry or towel-dried hair.

  1. Hold the bottle 4-6 inches from roots + hair.
  2. Spray generously throughout.
  3. Blow dry for added volume.
clinically proven volume, powered by biotech

Watch how K18’s proprietary interdimensional biotech fuels clinically proven, natural, touchable volume—without any stickiness, crunchiness, or weight.
how to use AirWash™ dry shampoo

instantly refresh

use between washes

SHAKE WELL. Non-aerosol format may feel slightly damp but will not disturb your style.

  1. Hold the bottle 4-6 inches away from scalp for even distribution
  2. Section hair and apply just 1 spray per section. Less is more. Add only as needed
  3. Massage in and brush or style as usual


If the hair feels gritty or powdery, you may have applied too much product. Brush hair to distribute the product, or reset hair with an in-shower shampoo.

Watch real people with different hair colors and textures discover the reinvention of dry shampoo: AirWash™.

Powered by patented K18 odorBIND™ biotechnology to detect and eliminate odors on contact. Translucent microbeads sponge up oil without white cast or buildup.

See them experience the future of clean in real time.
how to use the molecular repair mask

repair damage

use weekly after clarifying

  1. Shampoo, do not condition. Towel-dry thoroughly
  2. Apply 1-3 pumps of K18 leave-in molecular repair hair mask based on your length and density, starting at the ends and working up towards the roots (for the mini 15ml mask, use 3-9 pumps)
  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

PRO tip: Less is more with our highly concentrated formulas. Start with the 1 pump (3 pumps for mini 15ml mask) and build as needed.

If you’re not seeing results, or your hair feels dry, frizzy, and crunchy post-mask, troubleshoot here.

Check out our team’s K18 mask doses across all different hair types, lengths + levels of damage.

Once you’ve got your dose perfected be sure to follow these tips for your best #k18results

CLARIFY FIRST to remove heavy buildup + metals for maximum K18PEPTIDE™ penetration.

SKIP CONDITIONER so it doesn't block the K18PEPTIDE™ from reaching the innermost layers of hair.

APPLY TO DAMP HAIR so the cuticle is swollen and able to accept the K18PEPTIDE™. If hair is too dry the peptide can't penetrate, if it's too wet the product gets watered down. Think about 65% wet.

WAIT 4 MIN before doing anything else. After 4 minutes, your healthy hair results won’t wash out—so comb + style as usual.

Want maximum damage repair? PRO stylist Eric Vaughn shares how to use the K18 mask + oil together in your routine.
  1. Apply K18 mask on clean, damp hair
  2. Wait 4 minutes
  3. Apply K18 oil on damp hair
  4. Wait 4 minutes for reparative benefits from the K18PEPTIDE™
  5. Apply K18 oil on dry hair as a finisher + protect from heat styling
how to use the hair oil

smooth + strengthen

use daily

Apply to damp, towel-dried hair before styling, or on dry hair as a finisher. Highly concentrated formula. Start with 1-3 drops and build as needed.

  1. Apply 1-3 drops to damp hair from mid-lengths to ends. For strengthening benefits from the K18PEPTIDE™ wait 4 minutes before styling.
  2. Apply 1-3 drops to dry hair as a finisher.
Want maximum damage repair? PRO stylist Eric Vaughn shares how to use the K18 mask + oil together in your routine.
  1. Apply K18 mask on clean, damp hair
  2. Wait 4 minutes
  3. Apply K18 oil on damp hair
  4. Wait 4 minutes for reparative benefits from the K18PEPTIDE™
  5. Apply K18 oil on dry hair as a finisher + protect from heat styling
how to use DAMAGE SHIELD protective conditioner

detangle + protect

use on non-mask days

  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.


PRO tip: Less is more with our highly concentrated formulas. Start with the minimum amount and build as needed.
how to use DAMAGE SHIELD pH protective shampoo

gently cleanse

use on non-mask days

Safe to use every time you wash.

  1. Massage into hair, focusing on scalp
  2. Thoroughly rinse.
  3. Repeat as needed


PRO tip: Less is more with our highly concentrated formulas. Start with the minimum amount and build as needed.
how to use the clarifying detox shampoo

clarify

use weekly before mask

  1. Massage into hair + scalp to remove excess buildup
  2. Thoroughly rinse
  3. Repeat as needed

PRO tip: Less is more with our highly concentrated formulas. Start with the minimum amount and build as needed.

10