The same magical, clean formula as our best-selling Eyelash Serum—now in a powerful hair serum! Revitalize the appearance of fuller and thicker hair and beard with our advanced blend of active ingredients. Infused with biotin, peptides, keratin and other actives that support visibly stronger, fuller-looking hair. Best of all! The serum is easy to apply with a roll-on applicator and has a non-oily formula that doesn’t make your hair greasy.