The K18 Leave-In Molecular Repair Hair Mask is a professional-grade, breakthrough biotech treatment engineered to reverse hair damage at the molecular level in just 4 minutes. Powered by the patented K18PEPTIDE™, this highly concentrated leave-in treatment travels into the inner layers of the hair to reconnect broken polypeptide chains and disulfide bonds. Whether damage is caused by bleach, color treatments, chemical services, or extreme heat, this mask permanently restores strength, softness, smoothness, and bounce to all hair types, delivering immediate and lasting results.

Available Sizes: 0.5 fl. oz. (15ml) | 1.7 fl. oz. (50ml) | 5.1 fl. oz. (150ml)

Key Benefits

• Molecular-Level Repair: Permanently heals and reconnects broken keratin chains within the hair's inner structure, going deeper than traditional surface-level bond builders.

• Rapid 4-Minute Transformation: Reverses damage from bleach, color, chemical relaxers, and hot styling tools in a single, fast-acting 4-minute leave-in window.

• Restores Core Strength & Elasticity: Rebuilds the structural integrity of every strand, reviving natural snap-back, body, and bounce to weak or brittle hair.

• Universal Formula: Universally effective across all hair types, textures, and generations of damage, leaving hair touchably soft, smooth, and easy to manage.

• Clean & Sustainable Care: A vegan, color-safe, and cruelty-free formula that completely eliminates the need for a traditional conditioner, saving time and water.

How to Use

1. Cleanse: Wash hair thoroughly with a clarifying or pH-protective shampoo (like K18 DAMAGE SHIELD). Do not apply conditioner.

2. Prep: Towel-dry your hair thoroughly until it is damp, not soaking wet.

3. Dose: Start with 1 pump of the K18 Molecular Repair Hair Mask. Rub it completely between your palms until it turns white and creamy.

4. Apply: Distribute the cream evenly through your hair, starting at the ends and working your way up toward the roots. Add more product only if needed based on your hair length and density (average use is 1–3 pumps).

5. Activate: Let the mask sit undisturbed for exactly 4 minutes. Do not rinse it out.

6. Style: Once the 4 minutes are up, you can comb through, apply your favorite styling products or leave-ins, and style your hair as usual.

Pro Tip: Less is absolutely more with this highly concentrated formula. To get the maximum molecular benefit, use the mask consecutively for the first 4–6 washes after a salon service or chemical treatment to completely reset your hair's strength. Once your hair is restored, transition to a maintenance routine of using it just once every 3–4 washes.