Colorinn Must Series Bone Marrow Mask The most important protein that gives hair its strength and resistance is collagen. As the amount of collagen decreases, hair loses its strength and resistance, and hair loss and breakage begin. Bone marrow is a protein that naturally contains collagen. Colorinn bone marrow mask - penetrates deep into the hair roots and renews the hair strands - transfers the protein and nutrients your scalp needs to the hair. It repairs and strengthens hair strands by coating them with ceramides. Thus, hair quality and flexibility increases. It is a Colorinn Must Series product. Usage: Take a sufficient amount of the product in your palm and apply it to your damp hair from root to tip, wait for 5-10 minutes and rinse.