In this episode, my guest is Dr. Michael Eisenberg, MD, a urologist and professor specializing in male sexual function and fertility at Stanford University. Based on his clinical work and research, he is considered a top world expert on male sexual and reproductive health. We discuss testosterone levels and what really impacts them, testosterone therapy, sperm quality and counts, penile and testicular health and function, pelvic floor and prostate and urinary tract health, erectile function and dysfunction and the various causes and treatments for common male sexual, hormonal and reproductive challenges. We also address post-finasteride syndrome and trends in penile length. This episode is rich in actionable information about men’s sexual and reproductive health, including key tests and at-home evaluations, and the behavioral, nutritional, exercise and prescription-based tools that can support male sexual and reproductive health. For show notes, including referenced articles and additional resources, please visit hubermanlab.com. Thank you to our sponsors AG1: https://drinkag1.com/huberman ROKA: https://roka.com/huberman Eight Sleep: https://eightsleep.com/huberman LMNT: https://drinklmnt.com/huberman Momentous: https://www.livemomentous.com/huberman Timestamps (00:00:00) Dr. Michael Eisenberg (00:01:49) Sponsors: ROKA & Eight Sleep (00:04:20) Sperm Quality, Geographic & Environmental Factors  (00:12:00) Fertility & Sperm Quality; Testosterone, Cell Phones & Heat (00:19:26) Testosterone, Age, Obesity (00:26:49) Tool: Optimize Sperm Quality, Exogenous Testosterone, hCG (00:35:26) Sponsor: AG1 (00:36:57) Tool: Lifestyle Factors & Sperm Quality, Alcohol (00:43:27) Sperm Quality, Recreational & Over-the-Counter Drugs, Cannabis (00:46:56) High-Impact Sports, Traumatic Brain Injury (TBI), Pituitary & Testosterone (00:49:55) Bicycling, Numbness & Sexual Dysfunction; Walking & Testosterone (00:55:39) Exogenous Testosterone Therapy & Cancer (00:58:39) Sponsor: LMNT (00:59:57) Sexual & Urinary Health, Nighttime Urination (01:03:12) Sleep & Semen Quality; Overall Health (01:09:19) Tool: Sperm Analysis & Overall Health; Sperm Banking (01:13:21) Paternal Age & Puberty Trends; Older Fathers & Child Health Risk (01:26:42) Tool: Prostate Health, Urination; Tadalafil (Cialis) (01:33:02) Urinary Tract Infections (UTIs); Erectile Dysfunction Causes (01:38:21) Blood Flow & Erectile Dysfunction, Medication; Cardiovascular Health (01:44:30) Mechanical Erectile Dysfunction Treatments; Peptides; Delayed Ejaculation (01:52:36) Pelvic Floor Health, Urology & Physical Therapy; Split-Stream Urination (01:59:03) Penile Length & Trends; Dihydrotestosterone (DHT), Puberty (02:09:01) Hair Loss, Dutasteride, Finasteride & Sexual Health; Post-Finasteride Syndrome (02:16:11) Clomiphene, Testosterone & Estrogen Signaling (02:19:31) Follicle-Stimulating Hormone (FSH) Therapy; Prolactin, Estrogen (02:24:15) Varicocele; Peyronie’s Disease (02:27:26) Testis & Cancer Risk; Insurance, Blood Profiles & Semen Analysis (02:35:03) Zero-Cost Support, Spotify & Apple Reviews, Sponsors, YouTube Feedback, Momentous, Social Media, Neural Network Newsletter Title Card Photo Credit: Mike Blabac Disclaimer