K18 Hair Treatment is a leave-in molecular repair hair mask that is designed to repair damaged hair caused by bleach, color, or heat in just four minutes. It is powered by the K18Peptide, which is a patented molecular breakthrough that is clinically proven to reverse hair damage. The K18Peptide works at the innermost layers of the hair fiber to reconnect broken polypeptide chains, restoring hair strength and elasticity. The mask is formulated for all hair types, working particularly well on medium and thick hair. It is a color-safe, non-stripping clarifying shampoo that strengthens, soothes, and hydrates heat- and color-damaged hair. The K18 hair mask is similar to a leave-in conditioner in how its used. You shampoo your hair, forgo traditional conditioner, then use a pump (or more, depending on hair length and density) of K18 on towel-dried hair, prior to styling. The only crucial instruction is to evenly distribute the product and allow it to work four minutes on the hair before styling. The K18 hair mask is a game-changer and actually works to reverse damage in just four minutes. It is a less-straightforward treatment system than others, but it is recommended for every type of hair that has been damaged due to chemical treatments, including curly and coily hair.