Efficacy and mechanism of retinyl…ced skin photoaging.

Retinyl palmitate (a vitamin A form) helped protect skin cells from UV damage in lab tests by reducing collagen breakdown, lowering inflammatory markers (IL-6, IL-1β, TNF-α), and boosting cell repair. The research suggests it works through multiple pathways—basically, it's not a one-trick ingredient—but this was cell and tissue testing, not human skin studies.