Testosterone levels are rising

Across a nationally tracked cohort with consistent sampling and lab methods, total and free testosterone in American men have increased in recent waves while estradiol remained flat and sex‑hormone binding globulin fell, yielding a higher free androgen index. The rise is broad across ages and most racial groups and persists after controlling for time-of-day sampling and many measured environmental toxins and behaviors. — If robust, a population‑level rise in male androgens could affect fertility, population health, behavioral norms, and how policymakers interpret trends in obesity, aging, and social change.