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The primary function of hair serum in hairstyling is to add shine and reduce frizz. Hair serums are typically silicone-based products that create a smooth, reflective layer on the hair shaft, which helps to enhance its natural shine. They work effectively to combat frizz by sealing the hair cuticle, which can be particularly beneficial in humid conditions or for hair that is prone to dryness and flyaways. This smoothing effect not only gives the hair a polished look but also helps in improving manageability and tames unruly strands.

On the other hand, while other products might focus on providing hold, enhancing color, or promoting growth, these are not the primary functions of hair serums. Serums do not serve to add texture or structure like styling gels or mousses, nor are they designed to alter hair color. Additionally, promoting hair growth is a function associated with other types of treatments, such as specific conditioners or topical solutions, rather than serums that focus on styling and finishing effects.