Hair serum is a lightweight, liquid product designed to enhance the appearance and health of hair. It typically contains a blend of silicones, oils, and other nourishing ingredients that help to smooth frizz, add shine, and protect against heat damage. Hair serums can be used on various hair types, making them a versatile addition to hair care routines. To use hair serum, apply a small amount to damp or dry hair, focusing on the ends where damage is most likely to occur. Regular use can lead to softer, more manageable hair, while also providing a protective barrier against environmental factors like humidity and pollution.