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Testosterone & Hormones

Peer-reviewed research on testosterone, hormonal regulation, age-related change, and the lifestyle factors associated with male endocrine health.

80Studies

80Human studies

2026Most recent

11Countries

A population-level decline in serum testosterone levels in American men.

The Journal of clinical endocrinology and metabolism2007n = 1374 at baseline, decreasing to 489 by final follow-up

CohortHuman

This study set out to measure whether testosterone in American men had fallen over calendar time, separately from the fall that comes with getting older. It drew 2769 measurements from…

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