Yes, it can be safe to use a keratin hair mask on your scalp as well as your hair. But, it is important to keep in mind that some of the ingredients in the masks may irritate your scalp if you leave them on for too long or if you have sensitive skin. Be sure to read all instructions carefully before use and do not leave the product on for longer than indicated on the package. Generally, it’s best to apply hair masks from the mids to the ends!