Frequently Asked Questions


How does K18 work?

K18 utilizes a breakthrough patented oligopeptide (K18PeptideTM) 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 permanently and restoring ultimate strength, resilience and softness.

How do I use the K18 Mask at home?

The amount of Mask needed will vary depending on hair type, thickness, and condition. Refer to the chart below as a guide.  


Can you use K18 on a Brazilian blowout or a keratin treatment?

We did not design K18 products to be used as part of a keratin service. But, they are great to use after a keratin service. You can start using K18 after your first shampoo at home.

Is K18 a replacement for conditioner? 

K18’s primary goal is to regenerate broken bonds in order to rebuild and restore strength and elasticity to your hair. Any detangling or conditions benefits are a bonus. As long as you leave Mask in for 4 minutes, you can add a leave in conditioner if desired. Most people find they get all of the conditioning they need from using K18 Mask without conditioner.

Why do you use the product on towel dried hair?

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

Can I use styling products with K18?

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

Does K18 have UV protection?


Does K18 protect from heat?

No, but it repairs damage from heat styling.

Is K18 organic?

No, but it is vegan. 

When should I expect to see results?

You will start to see strengthening and smoothing results after the first use of K18.

Does K18 wash out of the hair?

No, K18 is clinically proven to not wash out of hair, even after repeated shampoos.

Should I use K18 before my conditioner or conditioning mask?

On the days you’re using K18, use it instead of your conditioner or conditioning masque. For clients seeking extra hydration, you can apply your conditioner or masque after the 4-minute treatment. You do not need to rinse K18 out.

Can I mix K18 with other styling products?

We do not recommend mixing K18 with other products, but you can layer styling products over K18 after the 4-minute processing time.

Can I use K18 on day 2 hair?

No, for best results use on towel-dried, damp hair after washing. 

Is K18 applied to dry or damp hair?

Always apply K18 to towel-dried, damp hair.

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.

Can I overuse K18?

K18 is a concentrated treatment. To avoid overuse, we recommend using K18 consecutively for 6 washes and then every 3-4 washes to maintain your healthiest hair.

Will K18 weigh my hair down?

No, the formula is lightweight and works on the inside of the hair so hair is left feeling clean and light. 

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.  

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 skip conditioner?

Conditioner formulas use silicones and conditioning agents that form heavy coatings on the hair which would prevent K18Peptide™ from penetrating to the broken bonds within the cortex. K18 is most effective on clean, towel-dried 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 

Orders & Privacy

Where is my order?

All orders will ship within 2 to 3 business days. Due to COVID19 UPS and USPS are delivering shipments later than usual. Once your package has shipped you should expect to receive it within 7 to 12 business days from the ship date.

What is the status of my order?

Once you have placed an order, you can check on its status at any time. Contact us if you are having trouble tracking your order.

How do I change or cancel an order?

If, for any reason, you would like to change your order, please call +1 415-495-7210 x 101 Mon – Fri between 8am and 5pm PST or contact us as soon as possible. We will make every effort to accommodate your request, however, please keep in mind our system is designed to fulfill orders as quickly as possible. As a result, we cannot cancel or change an order once it has entered the shipping process.

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?

We currently collect tax from: Arizona, California, Colorado, Connecticut, Florida, Georgia, Illinois, Indiana, Kansas, Kentucky, Maryland, Massachusetts, Michigan, Minnesota, Nevada, New Jersey, New York, North Carolina, Ohio, Pennsylvania, South Carolina, Tennessee, Texas, Virginia, Washington, and Wisconsin.

Do you have a price match policy?

If an item changes price within 7 days of purchase*, we will gladly price match it for you.

*Must be purchased directly. 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?

We’ve taken steps to ensure all information received from our online visitors is secure from unauthorized access and use. All transactions are completed on a secure server. In secure mode, your computer and our server send data back and forth in an encrypted format.

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