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Frequently Asked Questions

How does K18 work?

K18 utilizes a breakthrough patented oligopeptide (K18Peptide™) which shuttles amino acids (the building blocks of hair) into the inner structure of the hair. Once inside the hair cortex, the unique amino-acid chain goes directly to the broken disulfide bonds to replace the lost amino acids, regenerating the bond and restoring ultimate strength, resilience and softness.

How do I use the K18 Mask at home?

Follow these steps:

  1. Shampoo, rinse. Skip the conditioner.
  2. Towel dry hair thoroughly
  3. Apply Mask. Wait 4 minutes. Do not rinse.
  4. After 4 minutes, apply styling products if desired and dry/style as usual.

If I don't color my hair, will K18 be beneficial for my hair?

We highly encourage it. Our hair is not only damaged by color, but from heat, sun, products, water and environmental aggressors. K18 restores your hairs health and reverses any damage, everyone can benefit from K18.

Is K18 a replacement for conditioner?

K18’s primary goal is to restore your hairs strength and elasticity by repairing the keratin chains damaged from bleaching, coloring and thermal heat.

Detangling and conditioning benefits are just an added bonus. As long as you leave it on for 4 minutes, you can add a leave in conditioner, if desired. If heat styling, it is important to use a heat protectant after the 4-minute processing time.

Why do you skip conditioner?

K18 is most effective on clean, towel dried hair. Conditioner formulas use silicones and conditioning agents that form heavy coatings on hair that prevent K18 Peptide from penetrating to the broken disulfide bonds within the cortex. You may use conditioner after K18 has processed for 4 minutes if needed, not before.

Why is it important to apply K18 to clean hair?

We recommend applying K18 to clean hair as products can include oils, silicones, and film formers which will act as a barrier and can alter the efficacy of the product. In severe cases of product buildup, it may be necessary to use a clarifying or detoxifying shampoo for best results so that K18 may penetrate into the cortex.

Is K18 applied to dry or damp hair?

Always apply K18 to towel-dried, damp hair.

Why do you use K18 Mask on towel dried hair?

K18Peptide™ is not able to regenerate bonds in the presence of too much water inside the cortex. However, the hair needs to be slightly damp to help with penetration of the product into the hair.

Why do you need to leave the K18 Mask in?

K18 is more effective when left in. The formula is lightweight and works on the inside of the hair, so the hair is left feeling clean and light, even without rinsing it out.

Can I use styling products with K18?

You can layer styling products on top of K18 Mask after the 4 minute processing time.

What happens if I apply styling products before the 4 minutes after applying K18?

Applying styling products before the 4 minute processing time will diminish the efficacy of K18.

Can I use K18 every day?

K18 is designed to be used consecutively for 6 washes and then every 3-4 washes to maintain your healthiest hair possible.

Will K18 weigh my hair down?

No, the formula is lightweight and works from within the hair so hair is left feeling clean and light.

Does K18 wash out of the hair?

No, K18’s strengthening and smoothing results are clinically proven to remain in hair, even after repeated shampoos.

Is K18 considered a protein?

An extreme amount of protein is only possible when proteins are synthetic. They can be over- used and create build up in the hair resulting in brittle, weak hair. K18 is not a protein treatment. K18 is made up of 13 amino acids which form into a peptide chain nature intended. This technology regenerates the disulfide bond in the hair.

Can you use K18 on a Brazilian Blowout or a Keratin Treatment?

We do not recommend using K18 Mist or Mask prior to Brazilian or Keratin treatments. However, we do recommend that you use our K18 Mask on your first hair wash after treatment and for 6 consecutive times after.

Is K18 Organic?

K18 is not organic because only natural ingredients can be certified organic. K18 uses both natural and synthetic ingredients because we prioritize cleanliness and safety.

I noticed there's alcohol in the formula. Isn't that bad for my hair?

In chemistry, the term “alcohol” is used to describe a broad range of organic compounds. Although the ingredients have “alcohol” in the name, they all behave differently and serve different functions in a formula. Many of them are very different in appearance and function from Denatured or Isopropyl (rubbing) alcohol.

Denatured alcohol is used in K18 formulas because it opens keratin’s porous structure and helps deliver the peptide to the hair’s damaged sites.

Isopropyl alcohol is at a very low level (about 0.5%) in the K18 Mask formula. It is part of an ingredient blend, but it is not directly added to the formulas. It acts as a solvent by making the conditioning agents able to blend into the formulations.

Cetearyl alcohol is a fatty alcohol with a wax-like consistency. It is often used in hair care conditioning formulas because of its smoothing and softening qualities. It does not contain ethanol and therefore is used in products that are marketed as alcohol-free.

Benzyl alcohol is an aromatic alcohol used at 0.5% in the formulas and acts as a preservative. It does not contain ethanol and therefore is used in products that are marketed as alcohol-free.

I see wheat listed on the ingredient list. Can I use it if I have a wheat allergy?

Please consult with your physician before using K18 if you have a wheat allergy.

Is K18 safe to use during pregnancy?

Although K18Hair is free of sulfates, parabens, phthalates, silicones, artificial colors, sodium chloride, formaldehydes, is vegan, and cruelty-free, we recommend that clients always consult their doctors as they will have individualized care plans. We are happy to provide MSDS sheet.

What about allergies?

K18Hair is free of sulfates, parabens, phthalates, silicones, artificial colors, sodium chloride, formaldehydes, is vegan, and cruelty-free. Please consult with your physician. We are happy to provide MSDS sheet.



Orders & Privacy

Where is my order?

All orders will ship within 2-3 business days from purchase. You will receive an order confirmation email. Once your order ships, you will receive an alert via email with the tracking information.

Please NOTE: Due to the current pandemic, USPS has been severely impacted. There are instances where packages are being marked delivered when they haven’t. If this happens to you, please allow 7-10 days for USPS to attempt delivery and if you still don’t receive your order, please reach out to hello@k18hair.com for assistance. We appreciate your patience through these trying times and your continued support.

What is the status of my order?

Once your order is shipped, you will receive an alert via email with your tracking information. Please contact our customer service department at (415) 495-7210 X 101 or via email at hello@k18hair.com. Our business hours are Monday-Friday from 9-5pm PST.

How do I change or cancel an order?

If you would like to cancel your order, please call us immediately at (415) 495-7210 X 101 or contact us at hello@k18hair.com. Please keep in mind our system is designed to fulfill orders as quickly as possible. We will make every effort to accommodate your request. Once your order enters the shipping process, we cannot cancel or make any changes to your order.

When will my credit card be charged?

Your credit card will be charged at checkout. When your order is placed an email confirmation will be sent.

What are my payment options?

We accept Visa, Mastercard, American Express, Google Pay, Apple Pay and PayPal.

Do you collect taxes on purchases?


Do you have a price match policy


Please Note: All K18 products must be purchased directly from our website. This policy does not extend to our salon partner promotions.

Do you accept cash, CODs or checks?

Unfortunately, we cannot accept CODs, cash, checks, or collect calls.

Is my personal information and credit card information safe?


What is your privacy policy?

Click here to view our privacy policy.

What are your shipping and returns policies?

Click here to view our shipping and returns policies

Pro Distribution Partners


Questions? Email us at hello@k18hair.com

Paramount Beauty Supply


Salon Services Pro


Salon Service Group


Salonwax Pro


Premier Beauty Supply

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Ozdare - Australia

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American Crew Ltd. - New Zealand

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PlayGround - Hong Kong

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Session Map - Sweden

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Czech Republic

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