Which ingredient derived from vitamin A is known for promoting cell turnover?

Retinoids, which are derivatives of vitamin A, are highly regarded for their ability to promote cell turnover. This means they enhance the rate at which skin cells are renewed, resulting in a fresher and more youthful appearance of the skin. The mechanism through which retinoids work involves stimulating cellular proliferation and accelerating the shedding of dead skin cells. This process helps in diminishing the appearance of fine lines, improving skin texture, and tackling issues such as acne and hyperpigmentation.

In contrast, ascorbic acid, commonly known as vitamin C, is primarily recognized for its antioxidant properties and its role in collagen synthesis, rather than for promoting cell turnover. Alpha hydroxy acids (AHAs) are exfoliants that can also encourage cell turnover, but they work differently by loosening the bonds between dead skin cells on the surface rather than influencing deeper cell processes as retinoids do. Peptides serve various roles in skincare, particularly in repairing and building skin but do not specifically promote cell turnover in the same way retinoids do. Thus, retinoids stand out as the most effective in enhancing cell turnover among the listed options.