Testosterone in daily life is only useful when a clinically confirmed deficiency (hypogonadism) exists. In men with low levels and symptoms such as fatigue, reduced libido, or muscle weakness, medically supervised testosterone replacement can improve quality of life. Without proven deficiency, supplementation offers no established benefits and carries risks including cardiovascular events, sleep apnea, and prostate issues. Direct-to-consumer tests (e.g., saliva or blood) can provide a rough indication but are insufficient for diagnosis. Evidence for 'everyday' use in healthy men is weak; many perceived effects are placebo or marketing-driven. Bottom line: only useful when medically indicated and monitored by a physician.
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