Description
K18 Molecular Repair Hair Oil
Lightweight Repair Oil for Frizz, Shine, Smoothing & Heat Protection
K18 Molecular Repair Hair Oil is a lightweight, silicone-free finishing and treatment oil designed to help strengthen damaged hair while controlling frizz, smoothing flyaways and adding shine without heavy buildup.
Powered by K18PEPTIDE™, it combines K18's molecular repair technology with the benefits of a lightweight hair oil. It can be used on damp hair before styling or on dry hair as a finishing treatment and provides heat protection up to 450°F (232°C).
Choose K18 Molecular Repair Hair Oil when you want repair support plus smoothing, frizz control and shine from the same product.
Best For
- Damaged or weakened hair
- Bleached and colour-treated hair
- Frizz and flyaways
- Dull hair lacking shine
- Heat-styled hair
- Dry ends
- Fine hair needing a lightweight oil
- Thick or curly hair needing smoothing and finishing
- All hair types needing repair plus polish
Why You'll Love It
- Helps repair damage at the molecular level
- Helps strengthen weak or damaged hair
- Reduces frizz and flyaways
- Adds lightweight shine
- Softens and smooths
- Provides heat protection up to 450°F (232°C)
- Lightweight, silicone-free formula
- Can be used on damp or dry hair
- Colour-safe
K18 Hair Oil or HeatBounce?
Both provide heat protection, but they should not automatically be recommended together.
Choose K18 Molecular Repair Hair Oil when repair, frizz control, smoothing and shine are priorities and you also want heat protection.
Choose K18 HeatBounce when dedicated heat protection before blow-drying, flat ironing or curling is the main objective, especially when you want additional lightweight conditioning and manageability.
Use both only when your hair genuinely benefits from both steps. For example, HeatBounce can provide the primary conditioning heat-protection step before styling, while a very small amount of Molecular Repair Hair Oil can be used afterward for additional smoothing and shine.
K18 Oil, YOUNG.AGAIN.OIL or OLAPLEX No.7?
Choose K18 Molecular Repair Hair Oil when damaged hair is the priority and you want K18 molecular repair technology combined with smoothing, shine and heat protection.
Choose Kevin Murphy YOUNG.AGAIN.OIL when dry, brittle, dull or ageing hair needs lightweight restorative conditioning, softness and shine.
Choose OLAPLEX No.7 Bonding Oil when you want an OLAPLEX bond-focused finishing oil for shine, softness, frizz control and heat protection.
All three can create smoother, shinier hair, but the treatment technology and routine they support are different.
Build Your K18 Repair & Styling Routine
- Cleanse: Use K18 DAMAGE SHIELD pH Protective Shampoo for regular cleansing or PEPTIDE PREP Detox Shampoo periodically when buildup needs to be removed.
- Condition or Repair: Use DAMAGE SHIELD Protective Conditioner for regular conditioning or K18 Leave-In Molecular Repair Hair Mask according to its specific protocol when structural repair is needed.
- Protect: Add HeatBounce when dedicated conditioning heat protection is needed before styling.
- Smooth & Finish: Apply K18 Molecular Repair Hair Oil when additional repair support, frizz control, softness and shine are desired.
Choose Your Routine
Simple Repair + Finish:
K18 repair routine + Molecular Repair Hair Oil
Regular Maintenance + Frizz Control:
DAMAGE SHIELD Shampoo + DAMAGE SHIELD Conditioner + Molecular Repair Hair Oil
Frequent Heat Styling:
K18 wash/repair routine + HeatBounce
Heat Styling + Polished Finish:
K18 routine + HeatBounce before styling + a small amount of Molecular Repair Hair Oil as needed for finishing
How to Use
Apply 1–3 drops to clean, towel-dried hair before styling to help strengthen, smooth and protect the hair from heat. For additional shine and frizz control, apply 1–3 drops to dry hair as a finishing treatment. Adjust the amount according to hair length, density and texture.
Complete Your K18 Routine
Explore complementary K18 essentials: K18 HeatBounce Conditioning Heat Protectant and K18 Professional Leave-In Molecular Repair Hair Mask.
Shop the K18 Routine: Recommended Next Steps
Choose only the steps that match your hair goals; not every routine needs every product.
- Begin regular wash days with K18 DAMAGE SHIELD pH Protective Shampoo.
- For structural repair beyond a finishing oil, choose K18 Leave-In Molecular Repair Hair Mask.
- If dedicated pre-styling heat protection is the main goal, choose K18 HeatBounce Conditioning Heat Protectant.
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