If hot tools play an essential role in your expression—think blow dryers, curling irons, flat irons—a heat protectant might be in your arsenal. But how do products like our molecular repair hair oil magically prevent heat damage?  

Let’s dive in. 

heat damage 101 

Before we get into heat protectants, let’s chat about what they’re actually protecting you from—heat damage. Excessive heat degrades the cortex and damages the keratin chains responsible for your hair’s health + elasticity. This results in dry, lackluster, or frizzy hair. Yikes.  

It’s even worse on wet hair, as too high of a temperature can trap water molecules between keratin chains in very wet hair. These molecules are heated to their boiling point without a clear path to escape (think of a boiling tea kettle inside of each strand), causing bubble deformities to form in the hair shaft. This leads to the deterioration of the outer cuticle layer and further hair breakage. Curious about the science? Read more about heat damage here.  

So yeah, heat protectants are pretty important.  

where K18 comes in 

Since heat damage is happening at multiple layers of your hair, heat protection + damage reversal should too. At the innermost layers, our patented K18PEPTIDE™ in our molecular repair mask + oil reverses heat* damage (and bleach*, color*, and chemical service* damage too) with immediate and lasting results. That means you can restore strength, softness, smoothness, and bounce no matter how fried your hair is. 

At the outer layers, our molecular repair hair oil delivers 450°F (232°C) heat protection*. The star ingredients making this happen? Squalane, Hemisqualane, and Avocado Oil. We chose these for their ability to work together, with the latter having a high smoke point that resists breaking down until about 520°F. Thanks to these power players and weightless formula, you can get even heat protection without weighing down your strands. Best part is, you don’t have to choose between molecular repair and heat protection. Our oil does it all.  

how we test for heat protection 

It’s true. We’re all about the science here. That’s why we do rigorous testing to back up our oil’s heat protection claims in the lab. Here’s how we put our oil’s heat-protecting properties to the test.