What role does Insulin play in skin aging?

The provided context does not contain direct information on insulin's role in skin aging. In general scientific knowledge, insulin acts through the IGF-1 pathway and can influence skin aging via glycation, inflammation, and reduced autophagy when chronically elevated (e.g., in insulin resistance). However, these mechanisms are largely derived from animal and epidemiological studies. Without specific evidence from the given material, the evidence level must be marked as unclear. Consumers should be cautious of exaggerated claims from home tests that suggest a direct link between insulin and skin aging.