Best for: All hair types with damage, frizz, flyaways, split ends or dullness that need strengthening, smoothing, shine and heat protection.

What is K18 Molecular Repair Hair Oil?

K18 Molecular Repair Hair Oil is a biotech-engineered, weightless hair oil designed to strengthen hair, repair damage, reduce frizz and improve shine. Suitable for all hair types, it works on two levels of the hair fibre to target both the deeper-level damage that causes frizz and the visible frizz and flyaways on the surface of the hair.

Powered by K18PEPTIDE™ alongside avocado oil, sunflower oil, hemisqualane and squalane, this highly concentrated formula can be used on damp or dry hair for strengthening, smoothing, shine and heat protection up to 232°C.

Who is it best for?

K18 Molecular Repair Hair Oil may suit you if your hair:

• is damaged and needs strengthening
• is prone to frizz or flyaways
• has split ends
• looks dull and needs added shine
• needs heat protection when styling
• needs smoothing without being weighed down
• is colour-treated and you want to enhance colour vibrancy

K18 states that the Molecular Repair Hair Oil works on all hair types.

What problem does it solve?

K18 Molecular Repair Hair Oil is designed to tackle frizz at two levels of the hair fibre.

At the innermost layer of the hair, K18PEPTIDE™ addresses deeper-level damage that causes frizz by repairing and strengthening damage. On the surface, avocado oil, sunflower oil, hemisqualane and squalane nourish and smooth frizz and flyaways while improving shine and colour vibrancy.

This allows the oil to both address the damage that leads to frizz and immediately smooth visible frizz and flyaways.

K18 states that the formula provides 24-hour frizz control, a 104% increase in shine, a 78% reduction in split ends and heat protection up to 232°C.

Key ingredients

K18PEPTIDE™: Works at the innermost layer of the hair to address deeper-level damage that causes frizz, helping to repair and strengthen damaged hair.

Avocado Oil: One of the natural oils that works on the surface of the hair to nourish and smooth frizz and flyaways.

Sunflower Oil: Works alongside the other natural oils to nourish the surface of the hair and help smooth frizz and flyaways.

Hemisqualane + Squalane: Help nourish and smooth the hair's surface while supporting improved shine and colour vibrancy.

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.

How to use K18 Molecular Repair Hair Oil

K18 Molecular Repair Hair Oil can be applied to damp, towel-dried hair before styling or to dry hair as a finishing product.

The formula is highly concentrated, so start with 1–3 drops and build as needed.

On damp hair: Apply from the mid-lengths to ends for strengthening benefits and to reduce frizz during air-drying or styling. For strengthening benefits from K18PEPTIDE™, wait 4 minutes before styling.

On dry hair: Apply as a finishing product to smooth frizz and flyaways and add shine.

If using K18 Molecular Repair Hair Oil with the K18 Leave-In Molecular Repair Hair Mask, apply the mask first to clean, damp hair and wait 4 minutes. Then apply the hair oil and wait another 4 minutes for maximum strengthening results.

Why choose it?

Hair type: All hair types
Primary concerns: Damage + frizz
Best for: Strengthening, smoothing frizz and flyaways + adding shine
Formula: Weightless, highly concentrated hair oil
Key ingredients: K18PEPTIDE™ + avocado oil + sunflower oil + hemisqualane + squalane
Frizz control: Up to 24 hours
Heat protection: Up to 232°C
Size: 30ml
Routine step: Treat + style
Use on: Damp or dry hair
Brand: K18

Millies Expert Advice

K18 Molecular Repair Hair Oil is highly concentrated, so start with just 1–3 drops and build as needed rather than applying a large amount at once. Use it on damp hair from the mid-lengths to ends for strengthening and frizz-reducing benefits, or apply to dry hair as a finishing step when you want to smooth flyaways and add shine.

If you're also using the K18 Leave-In Molecular Repair Hair Mask, apply the mask first and wait the full 4 minutes before layering the oil on top.

Is K18 Molecular Repair Hair Oil right for me?

Choose this if: your hair is damaged or prone to frizz and flyaways and you want a weightless oil that combines strengthening and damage repair with smoothing, shine and heat protection.

Consider another product if: you're looking specifically for the K18 damage repair treatment used immediately after washing. K18 describes its Leave-In Molecular Repair Hair Mask as the damage repair treatment after washing, while the Molecular Repair Hair Oil is designed for smoothing, styling and strengthening and can be used on both damp and dry hair.

Frequently asked questions

What does K18 Molecular Repair Hair Oil do?

K18 Molecular Repair Hair Oil strengthens hair, repairs damage, reduces frizz and improves shine. It works on two levels of the hair fibre, addressing deeper-level damage that causes frizz while natural oils work on the surface to smooth frizz and flyaways.

Is K18 Molecular Repair Hair Oil suitable for all hair types?

Yes. K18 states that the Molecular Repair Hair Oil works on all hair types.

Does K18 Molecular Repair Hair Oil help with frizz?

Yes. K18 states that the oil addresses damage that causes frizz while immediately smoothing frizz and flyaways. The brand reports 24-hour frizz control.

Does K18 Molecular Repair Hair Oil provide heat protection?

Yes. K18 Molecular Repair Hair Oil provides heat protection up to 232°C.

Can I use K18 Molecular Repair Hair Oil on dry hair?

Yes. Apply it to dry hair as a finishing product to smooth frizz and flyaways and add shine.

Can I use K18 Molecular Repair Hair Oil on damp hair?

Yes. Apply to damp, towel-dried hair from the mid-lengths to ends before styling. K18 recommends waiting 4 minutes before styling for strengthening benefits from K18PEPTIDE™.

How much K18 Molecular Repair Hair Oil should I use?

The formula is highly concentrated. K18 recommends starting with 1–3 drops and building as needed.

Can I use K18 Molecular Repair Hair Oil with the K18 Hair Mask?

Yes. K18 recommends using the oil with the mask for maximum molecular repair with additional styling benefits. Apply the mask first, wait 4 minutes, then apply the oil.

Should I use the K18 Hair Oil instead of the K18 Hair Mask?

K18 recommends using the two products together rather than treating them as direct replacements. The mask is described as a damage repair treatment after washing, while the oil is used for smoothing, styling and strengthening.

Does K18 Molecular Repair Hair Oil weigh hair down?

K18 states that the weightless oil works on the surface of the hair without weighing it down. Because the formula is highly concentrated, the brand recommends starting with only 1–3 drops.

Does K18 Molecular Repair Hair Oil help with split ends?

K18 reports a 78% reduction in split ends after one application of the Molecular Repair Hair Oil on dry, bleached or damaged hair.

Does K18 Molecular Repair Hair Oil add shine?

Yes. K18 states that the oil enhances shine and colour vibrancy and reports a 104% increase in shine.