Not all serums are oil-free. Many serums contain oils for added benefits, but oil-free serums are formulated specifically without oils to cater to certain skin types or concerns.

Generally, dermatologists *do* like hyaluronic acid. It's a powerful humectant that draws moisture to the skin. However, in very dry climates, it may pull moisture from the skin's deeper layers if there isn't enough ambient humidity.

Serums with heavy oils like coconut oil or those with high concentrations of comedogenic ingredients are typically not recommended for oily skin. These can clog pores and exacerbate breakouts.

No, hyaluronic acid is not an oil-based serum. It's a water-based humectant, meaning it attracts and binds water to the skin, making it suitable for even oily skin types.