Is Cortisol useful for skin aging?

Cortisol, the primary stress hormone, is sometimes marketed for skin aging. The evidence is mixed. Acutely, cortisol has anti-inflammatory effects that can reduce redness. However, chronically elevated cortisol – due to stress – degrades collagen, impairs barrier function, and accelerates skin aging (wrinkles, loss of elasticity). Topical cortisol (as a glucocorticoid) is used medically for inflammation, but long-term use causes skin thinning, telangiectasias, and steroid acne. For over-the-counter anti-aging products, evidence is weak: mostly mechanistic or animal studies, with no robust human RCTs showing lasting benefit. Marketing often overstates efficacy. A healthier approach – stress reduction, sleep, balanced diet – has stronger support for skin longevity. Consumers should be cautious: cortisol's anti-aging role is not well-established, and misuse can harm skin. Evidence: mechanistic/mixed.