By: Kelly Callis APRN, Founder of Concierge Medical Clinic INTRO: Testosterone is often called the "male hormone" — but its role goes far beyond what most men realize. It affects energy, mood, muscle mass, sleep, sexual health and overall quality of life. And when levels drop — which happens naturally with age — the effects can be significant. The problem? Many men suffer in silence because they don't recognize the signs. Or they do recognize them but assume it's just "gettin