What role does MC4R play in skin aging?

MC4R (melanocortin-4 receptor) is primarily known for its role in energy homeostasis and appetite regulation. In the skin, the melanocortin system is involved in melanogenesis, inflammation, and potentially aging processes. Some mechanistic studies suggest MC4R signaling may influence collagen synthesis and UV-induced skin damage, but direct evidence for a role in skin aging is weak and largely speculative. Most research focuses on MC1R, which has a clearer link to pigmentation and skin cancer risk. MC4R variants are strongly associated with obesity, but a causal connection to skin aging is not established. Therefore, for skin aging concerns, attention should be on established factors like UV exposure, collagen degradation, and antioxidant protection. There is currently no actionable benefit from MC4R testing for anti-aging interventions.