Which ingredient would you expect to find in a hydrating skin product?

In a hydrating skin product, ceramides are particularly noted for their role in maintaining the skin's moisture barrier. Ceramides are naturally occurring lipids that help to retain moisture and prevent water loss, which is essential for keeping skin hydrated and supple. By reinforcing the skin's barrier function, ceramides can also improve its overall texture and resilience against environmental stressors.

In contrast, salicylic acid is primarily used for its exfoliating properties and to treat acne; alpha hydroxy acids (AHAs) serve to exfoliate the surface layer of the skin, promoting cell turnover and improving skin texture but can sometimes lead to dryness. Beta hydroxy acid (BHAs), such as salicylic acid, penetrate oil-based substances and target clogged pores and are also more exfoliating than hydrating. Thus, while the other ingredients have their own skin benefits, they do not primarily focus on hydration in the same manner that ceramides do.