What is the primary use of hair serum?

The primary use of hair serum is to add shine and tame frizz, making strands appear smoother and more polished. Hair serums are typically formulated with various silicones and oils, which coat the hair, helping to seal moisture in and reduce the appearance of flyaways. This protective layer not only enhances shine but also helps to manage frizz, particularly in humid conditions.

While hair color products are specifically designed for changing the color of the hair, serums focus on the health and appearance of the existing hair rather than altering its hue. Similarly, while products that add shape or volume do exist, they tend to fall into other categories like mousses or gels, rather than serums. Protecting hair from UV rays is an essential concern for hair health, but serums are not primarily positioned as a UV protectant; they often focus more on shine and frizz control rather than sun protection. Thus, the primary attribute of hair serum clearly aligns with adding shine and managing frizz, making that the correct choice.