Which of the following is a characteristic of retinoids?

Retinoids are a class of compounds that are derivatives of vitamin A and are well-known for their ability to promote cell turnover. This characteristic is essential in skincare, especially for treating various skin conditions such as acne, hyperpigmentation, and aging. By accelerating the rate at which skin cells regenerate, retinoids help to slough off dead skin cells, reveal fresher skin underneath, and stimulate the production of new skin cells. This process can lead to improved skin texture, reduced fine lines, and a more even skin tone.

While hydrating agents are important in skincare for moisture and skin barrier function, retinoids are not primarily known for hydration. Instead, they often have a drying effect, especially when first used. Sun protection is crucial when using retinoids, as they can make the skin more sensitive to the sun, but retinoids themselves do not provide sun protection. Additionally, while some formulations of retinoids might be designed to be gentle, many can cause irritation, redness, or dryness, particularly when introduced to the skin regimen too quickly. Hence, the characteristic of promoting cell turnover is defining in the context of retinoids and underscores their efficacy in many topical skincare treatments.