Is Insulin useful for skin aging?

The question of whether insulin is useful for skin aging has weak scientific support. Insulin is primarily a glucose-regulating hormone; its role in skin aging is indirect via the IGF-1 pathway and mTOR activation. Some in vitro studies suggest it may promote collagen synthesis, but robust human clinical data are lacking. Topical insulin is occasionally used in dermatology for wound healing, but not as a standard anti-aging treatment. Risks include potential hypoglycemia from systemic absorption, and chronic activation of insulin/IGF-1 signaling is associated with accelerated skin aging and increased cancer risk. The evidence is mechanistic, based on animal models or cell cultures. For anti-aging, established interventions like sunscreen, retinoids, and antioxidants have far stronger evidence. Consumer tests (e.g., MyBody-X) do not directly measure insulin in a skin-relevant context; interpreting blood insulin levels for skin aging is speculative. Conclusion: Insulin is not recommended for skin aging without medical supervision.