A hair serum is a leave-in hair treatment product typically used to improve hair texture and appearance. L'Oral Paris Elvive Dream Lengths Frizz Killer Serum is an example of a popular hair serum.
Hair serums are often used to address specific hair concerns such as frizz, dryness, or damage. They typically contain a blend of ingredients like silicones, oils, and vitamins that coat the hair shaft to smooth, protect, and add shine. The use of hair serums has become increasingly popular in recent years as people seek ways to maintain healthy, stylish hair.