Salon hair care. Experience Nexxus luxury. Scientifically developed. Salon proven. Nexxus Volumizing Hair Care Products are scientifically proven to give you naturally lush, thicker hair. Together, they actually increase the diameter of the hair shaft for noticeably thicker, healthier-looking hair. Headress Thickening Leave-In Volumizer, with exclusive time-released technology, helps build thicker, fuller hair. Fortified with exclusive NexxuSphere time released technology, containing nutrients, antioxidants, and UV protectors. Never tested on animals. Made in USA.