K18 Leave-In Molecular Repair Hair Mask

The K18 Leave-In Molecular Repair Hair Mask is a leave-in repairing mask that deeply targets damaged hair, using patented biomimetic technology to reconnect broken keratin chains. If you're looking for a professional treatment that truly repairs damage caused by bleaching, chemical treatments, or heat styling, this innovative formula works at a molecular level to restore strength, elasticity, and shine to your hair in just 4 minutes.

Who it's for

Ideal for damaged, fragile, dry, or chemically treated hair (bleached, colored, permed). Perfect if your hair breaks easily, has lost elasticity, or appears dull and brittle. Suitable for all hair types that require deep and lasting repair, just like the most advanced professional treatments available in salons.

• Repairs damage at a molecular level by reconnecting broken keratin chains
• Restores strength and elasticity to damaged hair in 4 minutes
• Reduces breakage and improves tensile strength by up to 78%
• Visible and measurable results from the first use
• Lightweight leave-in formula that doesn't weigh hair down or make it greasy

How to use

After shampooing (ideally with K18 Detox Shampoo for deep cleansing), towel-dry hair to remove excess water. Apply 1-3 pumps of product (depending on hair length and density) distributing evenly from roots to ends. Leave on for 4 minutes without rinsing. Then proceed with blow-drying or styling as usual. For very damaged hair, use with every wash; for maintenance, 1-2 times a week.

From the very first use, you'll notice softer, more manageable, and visibly healthier hair. With continued use, hair regains strength, elasticity, and shine, significantly reducing breakage. The texture appears smoother and more compact, while the hair fiber looks rebuilt from within. To enhance results, you can complete the routine with K18 Hair Oil, which also offers heat protection up to 232°C.

Active Ingredients

The core of the formula is the K18 peptide, a patented biomimetic sequence of 18 amino acids that precisely replicates a portion of the human keratin chain. This peptide penetrates the hair's cortex and binds to damaged keratin chains, reconnecting them at a molecular level. Unlike superficial treatments, K18 repairs the hair's internal structure for lasting and measurable results.

• Format: bottle with spray dispenser
• Technology: patented K18 biomimetic peptide
• Processing time: 4 minutes
• Type: leave-in treatment, no rinse required
• Professional formulation developed for salon use
• Clinically tested with measurable results

Planethair is an Italian shop specializing in professional hair and skincare products, online since 2000 and with over 25 years of experience in the professional haircare sector. We were the first e-commerce in Italy dedicated to high-end salon brands. We offer only original products with dedicated assistance to help you choose the most suitable treatments for your specific needs.

Frequently Asked Questions

How much product should I use per application?
It depends on hair length and density: 1 pump for short hair, 2 for medium, 3 for long or very thick hair. Start with less product and add more if necessary.

Can I use K18 with other products?
Yes, but for optimal results, apply K18 to clean, damp hair before any other styling products. Leave on for 4 minutes, then proceed with your usual routine.

How long does a bottle last?
With regular use (2-3 times a week) on medium hair, a bottle lasts approximately 2-3 months. For very damaged hair requiring daily use, the duration will be shorter.

Is it suitable for fine hair too?
Absolutely. The formula is lightweight and doesn't weigh hair down, making it perfect for fine hair that needs repair without losing volume.

Also discover other products from the K18 Hair line for a complete repair routine, or explore our selection of products for damaged hair with targeted solutions for every need.