Testosterone deficiency occurs when the body doesn’t produce enough testosterone, a hormone primarily responsible for male characteristics such as muscle mass, bone density, and the production of sperm. Beyond physical attributes, testosterone plays a crucial role in regulating mood, energy levels, and overall well-being. When levels are low, individuals may experience symptoms like fatigue, decreased libido, and mood changes. Hormone replacement therapy can help restore testosterone levels, alleviating symptoms and promoting better health and vitality.