K18 is a leave-in molecular repair mask (emphasis on leave-in) that strengthens, soothes and hydrates heat- and colour-damaged hair. And it only takes four minutes after combing it through clean, wet hair to work its magic. The catch, however, is that K18 only works on unconditioned hair. Meaning, you’re supposed to skip the conditioner after shampooing your scalp to reap the benefits.

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Unlike other hair masks, K18 uses a patented peptide technology, meaning it’s a high-concentrate formula that targets hair molecules to give you the healthiest, bounciest strands of your life. And yes, it’s 100% safe to use at home. Amazon and Sephora reviewers are raving about its speedy technology that instantly transforms strands from stringy to strong and bouncy—regardless of hair type.