Your skin has been estrogen-dependent since puberty — and when levels decline, the changes go far deeper than the surface. Reduced collagen, lost elasticity, and decreased moisture retention are all tied to one hormone. Here’s what the science says about applying estrogen directly to the skin, and whether it works.

MK-677 vs Sermorelin explained: mechanisms, pros/cons, who each suits, and how to choose—plus safety and monitoring. Educational only; not medical advice.