K18 Molecular Repair Hair Oil is a biotech-engineered, weightless treatment oil designed to repair damage, reduce frizz, and enhance shine at two levels of the hair fibre. This highly concentrated formula strengthens from within using the patented K18PEPTIDE™, while natural lightweight oils instantly smooth, protect, and add long-lasting gloss.

Clinically proven to deliver:

• 24-hour frizz control
• 104% more shine
• 78% fewer split ends
• Heat protection up to 450°F (232°C)
  

A powerful multi-benefit oil suitable for all hair types—especially damaged, colour-treated, chemically processed, or frizz-prone hair.

What It Does

K18 Molecular Repair Hair Oil works on both the internal and external layers of the hair fibre, targeting the root causes of frizz rather than masking it.

Internal Repair (Molecular Level) – The K18PEPTIDE™ moves into the inner cortex to repair damage that weakens the fibre and increases frizz. This helps restore strength, elasticity, and resilience.

Surface Smoothing (Cuticle Level) – Lightweight oils, including avocado, sunflower oil, hemisqualane, and squalane, nourish and smooth the outer cuticle, reducing flyaways while improving shine and colour vibrancy.

This dual-action approach provides longer-lasting smoothing benefits compared to typical silicone-based oils.

Key Benefits

• Works on the molecular level to repair damaged hair
• Provides 24-hour frizz control without weight
• Strengthens the hair fibre with K18PEPTIDE™
  
• Smooths frizz and flyaways instantly
• Enhances shine and boosts colour vibrancy
• Reduces split ends by up to 78%
• Protects from heat damage up to 450°F (232°C)
• Lightweight, silicone-free formula that won’t build up
• Suitable for damp or dry hair

Why It Works 

The formula combines biomimetic peptide technology with nutrient-rich natural oils:

K18PEPTIDE™: A breakthrough peptide that reconnects broken keratin chains, rebuilding strength and reducing internal fibre weakness—the core source of frizz, breakage, and dullness.

Hemisqualane + Squalane: Ultra-light emollients that mimic hair’s natural lipids, improving shine, softness, and moisture retention without heaviness.

Avocado & Sunflower Oil: Nutrient-dense oils that smooth the cuticle, reduce static, and create a protective shield against external aggressors.

Heat Defense Complex: Provides high-level protection against thermal damage caused by blow dryers, straighteners, and curling tools.

This synergy creates a stable hair environment resistant to humidity, static, dryness, and styling stress.

How to Use

On Damp Hair:

• Apply 1–3 drops from mid-lengths to ends.
• For strengthening benefits, allow the oil to sit for 4 minutes before styling.
• Ideal for reducing frizz during air-drying or heat styling.
  

On Dry Hair:

• Use 1–2 drops to smooth frizz, refine flyaways, and elevate shine.
  

Pro Tip:
If using the K18 Leave-In Molecular Repair Mask, apply the mask first on damp hair.

• Wait 4 minutes
• Apply the Molecular Repair Hair Oil
• Wait another 4 minutes before styling for maximum strengthening synergy.

Who It’s For

• Damaged, over-processed, or chemically treated hair
• Frizzy, puffy, or coarse hair textures
• Colour-treated hair needing shine and vibrancy
• Dry, porous hair prone to breakage
• Fine to thick hair needing lightweight smoothing
• Anyone looking for a high-performance oil that repairs and protects

Clinical Insights

Backed by K18’s internal testing, this oil has demonstrated:

• Significant improvement in shine
• Long-lasting frizz control
• Reduction in split ends
• Enhanced strength and smoother texture
• Increased styling manageability
  

These results support ranking signals for expertise and trustworthiness, strengthening E-E-A-T on product-level SEO.

Full Ingredients

Caprylyl Caprylate/Caprate, Squalane, Persea Gratissima (Avocado) Oil, Helianthus Annuus (Sunflower) Oil, C13-15 Alkane, Undecane, Benzyl Alcohol, Tridecane, Castor Isostearate Succinate, Propanediol, sh-Oligopeptide-78, Fragrance (Parfum), Tocopherol, Cinnamal, Hexyl Cinnamal, Limonene, Linalool.

For the most accurate and up-to-date list, please refer to product packaging.