Frequently Asked Questions

Everything you need to know about our molecular hair repair technology.

How does the K18 peptide therapy work?

Our patented K18PEPTIDE™ travels into the innermost layers of hair to reach the core polypeptide chains, reconnecting broken bonds caused by bleach, color, and heat styling for lasting strength and elasticity.

Do I need to use conditioner with the K18 Leave-In Mask?

For best results, do not condition your hair before applying the K18 mask. Most conditioners contain silicones that create a barrier, preventing our peptide from penetrating the hair shaft effectively.

How long does shipping take for my order?

Standard shipping typically takes 3-5 business days within the continental US. You will receive a tracking number via email as soon as your order leaves our warehouse.

What is your return policy?

We offer a 30-day satisfaction guarantee. If you are not completely satisfied with your results, you can return the product within 30 days of purchase for a full refund, minus shipping costs.

Are K18 products vegan and cruelty-free?

Yes, all K18 products are 100% vegan, cruelty-free, and Leaping Bunny certified. We do not test on animals at any stage of product development.

Can I use K18 on hair extensions?

K18 can be used on natural hair extensions to help maintain their integrity. However, we recommend avoiding the attachment points (bonds or tape) to prevent slipping or loosening.