What type of product is often recommended for providing shine to the hair?

Hair oil is often recommended for providing shine to the hair due to its moisturizing properties. Oils can penetrate the hair shaft, helping to nourish and hydrate the hair, which enhances its natural shine and luster. Additionally, the application of hair oil can create a smooth surface on the strands, reflecting light and giving the appearance of shiny hair.

Hair gels are primarily designed for hold and styling, offering a firm structure to the hairstyle rather than focusing on adding shine. While some gels may have a glossy finish, they typically lack the nourishing benefits that oils provide. Hair wax, while effective for styling and adding texture, also does not contribute significantly to shine like oils can. Hair mousse is intended to provide volume and body, and though it may contribute a slight shine, its main purpose is not to enhance shine like hair oil does. Thus, hair oil stands out as the most effective choice for achieving shiny hair.