Which type of product is often used to add shine to hair?

Hair serum or gloss is commonly used to add shine to hair due to its formulation, which typically contains silicones and other smoothing agents that coat the hair shaft. These products work by reflecting light, creating a shiny, polished appearance, while also helping to tame frizz and provide a smooth texture. Unlike hair spray, which is primarily used for holding styles, or hair gel, which defines curls or adds structure, serums and glosses are specifically designed to enhance the hair's natural shine. Shampoo, while essential for cleansing, doesn't contribute to shine in the same way, as it focuses on removing dirt and excess oils rather than providing luster.