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Weekly Estradiol Injections Cut Testosterone in 29 Patients

11/13/2025

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Story summary
  • The Journal of the Endocrine Society reports weekly injectable estradiol for hormone replacement therapy reduces testosterone in 29 patients over 15 months.
  • Testosterone levels fell even as the average dose declined from 4.3 mg to 3.7 mg.
  • Spironolactone did not lower testosterone levels and may decrease estradiol levels in the study.