Hair serum has many functions, including helping to protect hair from the effects of damage caused by exposure to sunlight and hair products, relaxes the hair so that it does not tangle easily, and makes hair more shiny. However, you must be smart in choosing hair serum so that you can get the maximum benefits. In the medical definition, serum is a liquid that has a high content of certain substances, especially protein. In the world of beauty, hair serum is known as one of a series of hair care products in the form of concentrated liquids that contain a variety of nutrients to maintain healthy hair. Most hair serum products are water-based, so they are absorbed quickly into the scalp and hair roots. When choosing hair serum, you need to consider what content it contains. List of Nutrition in Choosing the Right Hair Serum Hair serum with the following nutrients can be the right choice to maintain healthy hair and help overcome hair problems. Biotin To help overcome the prob