Evidence check: APOA2 in the context of skin aging

The evidence linking APOA2 (apolipoprotein A-II) to skin aging is weak and largely mechanistic. APOA2 is a component of HDL and is involved in lipid metabolism and inflammation. Some in vitro and animal studies suggest it may influence oxidative stress and skin barrier function, but no robust human trials have demonstrated a direct effect on skin aging. Direct-to-consumer genetic tests reporting APOA2 variants should not be used to guide anti-aging interventions. The current evidence is insufficient to support any specific recommendation. Lifestyle factors such as sun protection, diet, and antioxidant intake remain far more substantiated for skin health. Evidence level: mechanistic/unclear.