uihair

K18 Leave-In Molecular Repair Hair

$78.93 USD

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size 15ml 50ml 150ml

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Stop Masking Damage. Start Repairing It.

Repair Bleached, Dry & Straw-Like Hair in Just 4 Minutes — No Rinse Needed.

✔ Over 100,000+ Happy Users
✔ Salon-Grade Treatment
✔ Trusted Worldwide

Why Most Hair Treatments Don’t Work

Most conditioners and masks only coat your hair with silicone.
The result? Temporary softness that disappears after one wash.

❌ No real repair
❌ Hair still breaks
❌ Damage keeps getting worse

Meet K18 Molecular Repair Treatment

Unlike traditional products, K18 works at the molecular level.

✔ Reconnects broken keratin chains
✔ Repairs damage from bleach, color & heat
✔ Restores strength, softness & elasticity
✔ Results that don’t wash away

Is This You?

Hair feels like “cotton candy” when wet
Ends are dry, brittle, and breaking
You bleach or color your hair often
Nothing seems to actually fix the damage

If yes — K18 was made for you.

The Science Behind K18

Powered by patented K18Peptide™, this formula mimics the natural building blocks of hair to reconnect broken keratin chains deep inside the hair structure.

This isn’t surface repair — it’s true structural restoration.

Why Customers Love It

✔ Repairs hair in just 4 minutes
✔ Leave-in formula (no rinse)
✔ Lightweight & non-greasy
✔ Reduces frizz & improves manageability
✔ Long-term hair health improvement

💎 Pro Tip: Perfect for Hair Extensions

Hair extensions don’t receive natural scalp oils — which makes them dry out faster.

K18 helps extend the life of your extensions by up to 2–3x, keeping them softer, smoother, and more durable.

Why Is K18 Worth It?

A single salon repair treatment can cost $80–$150.

K18 delivers professional-grade results at home — saving you hundreds over time.

How to Use

Shampoo your hair (do NOT use conditioner)
Towel dry until damp
Apply 1–3 pumps evenly
Wait 4 minutes (do NOT rinse)
Style as usual

Product Details

Product Name: K18 Leave-In Molecular Repair Hair Mask
Type: Leave-In Treatment
Suitable For: Damaged, bleached, color-treated hair
Texture: Lightweight cream
Treatment Time: 4 minutes
Usage: 2–3 times per week
Sizes: 15ml / 50ml / 150ml
Key Ingredients: K18Peptide™, Water (Aqua), Alcohol Denat, Propylene Glycol.
Ph Level: 5.0-6.0 (Optimized for hair health)

Try It Risk-Free

We stand behind our product.

✔ 30-Day Money Back Guarantee
✔ No questions asked
✔ See visible results or get your money back

Frequently Asked Questions

Is K18 better than Olaplex?
K18 works at the molecular level and repairs hair in just 4 minutes, while Olaplex requires longer treatments.

Can K18 repair bleach damaged hair?
Yes, it is specifically designed to reverse damage from bleaching and chemical services.

Why should I skip conditioner?
Conditioner creates a barrier that prevents K18 from penetrating the hair structure.

How often should I use it?
Use for the first 4–6 washes, then every 3–4 washes for maintenance.

Will the results wash out?
No. K18 reconnects hair structure, making results long-lasting.

Does it work on extensions?
Yes, it helps maintain softness and extend lifespan of human hair extensions.

Is it suitable for all hair types?
Yes, including curly, straight, chemically treated, and natural hair.

Does it make hair greasy?
No, the formula is lightweight and absorbs quickly.

Works Perfectly With

Silk Top Hair Toppers
Human Hair Extensions
UV Hair Extension System

✨ About Our Hair

UIHAIR specializes in premium human hair wigs, extensions, and toppers designed for a natural look and comfortable daily wear.
Our hair is soft, long-lasting, ethically sourced, and easy to style.
Perfect for daily wear, hair thinning, volume boosting, color changes, and heat styling.
All items are hand-crafted with strict quality control.

🚿 Hair Care & Maintenance:

1. Daily Care Tips:
Comb gently from the ends to the roots using a wide-tooth comb or fingers.
Apply a small amount of leave-in conditioner or argan oil to keep the hair soft and shiny.
Avoid sleeping with wet hair. Braiding your hair before bed will help reduce tangling.
2. How to Wash the Hair:
Fill a basin or sink with lukewarm water.
Add a small amount of sulfate-free shampoo.
Gently dip and lift the hair (do not rub or twist).
Rinse thoroughly with clean water.
Apply a moisturizing conditioner and let it sit for 3-5 minutes.
Rinse well and air-dry the hair on a wig stand for best results.
3. What to Avoid:
Alcohol-based styling products, as they can dry out the hair.
Over-brushing or combing the hair when wet, as it can cause breakage.
High heat (above 180°C / 350°F), as excessive heat can damage the hair fibers.
Extended exposure to chlorine or salt water.

❓ FAQ

1. What makes your wigs different?
Our wigs are made from 100% virgin human hair, ensuring a natural look and feel, and they can be styled just like your own hair.

2. Can I color or dye the wig?
Yes, our virgin hair wigs can be dyed. We recommend professional coloring for best results.

3. How long do the wigs last?
With proper care, our wigs can last 1–3 years.

4. Are your wigs suitable for sensitive scalps?
Yes, our wigs have a soft lace for a comfortable fit, perfect for sensitive scalps.

5. Can I wear the wig while exercising or swimming?
It’s best to remove your wig before swimming or intense exercise to avoid damage.

6. How do I pick the right color?
Our most popular shades include Natural Black, Dark Brown, Blonde, and rooted T-mixed colors. We also offer a free color-matching service.