Molecular Repair Hair Oil

The Molecular Repair Hair Oil by K18 is a biotech-engineered, silicone-free weightless oil that repairs hair damage at the molecular level, delivers 24-hour frizz control and dramatically boosts shine — in a single application, across all hair types.

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K18 reparative hair oil powered by patented K18PEPTIDE™

Unlike conventional hair oils that simply coat the surface of the cuticle, the Molecular Repair Hair Oil works at two distinct levels simultaneously.

Deep within the hair fibre, the patented K18PEPTIDE™ penetrates to the innermost layer to address the molecular damage that causes persistent frizz : reconnecting the broken polypeptide chains severed by chemical, thermal and mechanical stress.

At the surface, a complex of natural oils (avocado, sunflower, hemisqualane and squalane) nourishes and smooths the cuticle for immediate frizz control, amplified shine and heat protection up to 450°F (232°C).

The ultra-concentrated, silicone-free formula of K18 hair oil treatment absorbs without greasiness, leaves no coating or buildup, and works beautifully on all hair types and textures, including fine hair.

The hair benefits of K18 lightweight reparative anti-frizz hair oil

• Clinically proven molecular repair: frizz-causing damage is addressed at its source, deep within the hair fibre, for lasting results that go far beyond surface-level smoothing.
• 24-hour frizz control: the cuticle is smoothed and the fibre strengthened for all-day discipline without heaviness, residue or buildup.
• Exceptional shine boost: a nourished, uniform cuticle surface reflects light more intensely, revealing brilliant shine and enhanced colour vibrancy.
• Visibly reduced split ends: the hair fibre is reinforced and weakened ends sealed, durably limiting split end formation.
• Heat protection up to 450°F (232°C): natural oils form a protective surface shield on the cuticle to prevent further heat-induced damage during styling.
• Ultra-lightweight, silicone-free formula: absorbs without greasiness or heaviness, even on the finest hair, with no coating effect and no buildup over time.

Clinically proven results from the K18 Molecular Repair Hair Oil*

• Clinically proven damage repair from the first use.
• 24-hour frizz control.
• 104% increase in shine.
• 78% reduction in split ends.
• Heat protection up to 450°F (232°C).

Key ingredients

• K18PEPTIDE™ – a patented bioactive peptide that penetrates the hair cortex to repair the broken polypeptide chains at the root of damage and persistent frizz
• Avocado – an essential fatty acid-rich plant oil that deeply nourishes the hair fibre, improves shine and smooths the cuticle
• Sunflower – a lightweight, non-greasy oil that delivers softness, fluidity and shine without weighing hair down or leaving any coating
• Hemisqualane and squalane – ultra-lightweight biomimetic actives that instantly smooth frizz and flyaways, protect the cuticle surface and amplify shine
• Tocopherol – vitamin E that neutralises free radicals and protects the hair fibre from oxidative stress and environmental aggressors

A reparative hair oil for all hair types and textures, including colour-treated, bleached, heat-damaged and fine hair.

*Results observed in clinical testing. See k18hair.com/disclaimers.

How to use the K18 Molecular Repair Hair Oil

Apply 1–3 drops to towel-dried hair from mid-lengths to ends. For strengthening benefits from the K18PEPTIDE™, wait 4 minutes before styling.

Can also be applied to dry hair as a finishing oil to smooth frizz and add shine.

Highly concentrated formula : start small and build as needed. When using alongside the K18 mask, apply the mask first, wait 4 minutes, then apply the oil for maximum reparative results.