Evidence check: Testosteron in the context of Müdigkeit

The provided context does not contain specific studies or guidelines on testosterone and fatigue. In general, clinically significant testosterone deficiency (hypogonadism) is associated with fatigue, low energy, and reduced libido. However, evidence for testosterone therapy in fatigue without confirmed deficiency is weak. Many commercial providers market testosterone tests as 'anti-aging' or 'energy boosters', yet large RCTs show no benefit in eugonadal men and even reveal cardiovascular risks. For women, data are even scarcer. Testosterone measurement is methodologically challenging (circadian rhythm, saliva vs. serum). Therefore, testing should only be considered when hypogonadism is clinically suspected and after ruling out more common causes (thyroid, iron deficiency, sleep apnea). Evidence is human-strong for benefit in confirmed deficiency, but marketing for broad fatigue testing. No sources from the provided context.