Episode Details

Most men who start testosterone never needed it, and some who genuinely do never get treated. In the final episode of the Signal series, Dr. Jordan Feigenbaum and Dr. Austin Baraki work through who actually needs testosterone replacement, who got sold it, and what the evidence says about the risks that scared the field for a decade. We cover the blinded trial where men couldn't tell real testosterone from placebo, what the heart and prostate data actually show now that we have the trials, what testosterone does to fertility, and the framework we use to decide. We also close the story of Mark, the patient whose lab result started the series.

This is educational content, not medical advice. Talk to your physician about your personal situation.

Here we cover the real diagnosis of testosterone deficiency, primary versus secondary low testosterone, how the system both over- and under-prescribes, the SHBG trap that makes a normal level look low, the gray-zone crossover study, what replacement should actually target, why most men quit within a year, testosterone as a male contraceptive, the TRAVERSE cardiovascular results, the saturation model and prostate safety, the blood side effect worth monitoring, and when not to start at all.

Timestamps:

• 00:00 The study almost nobody mentions 
• 01:31 Who this episode is for 
• 03:35 What a real testosterone diagnosis requires 
• 07:18 Primary vs secondary low testosterone 
• 10:12 How testosterone gets over-prescribed 
• 11:35 The SHBG trap: when a low number misleads 
• 18:10 Would GLP-1 plus testosterone work better? 
• 22:19 Why genuine deficiency gets under-treated
•  24:15 The cardiovascular scare and where it came from 
• 34:11 The gray-zone study, in full 
• 41:02 What TRT should actually target, and the "900" myth 
• 47:38 Running TRT as a trial, and why 70% quit 
• 52:36 Testosterone as a contraceptive: the fertility cost 
• 57:19 Does TRT cause heart problems? The TRAVERSE trial 
• 01:01:40 Testosterone and the prostate 
• 01:09:13 The blood side effect worth watching 
• 01:12:02 When not to start testosterone 
• 01:14:26 Who actually benefits from TRT 
• 01:18:28 The Signal framework, and what happened to Mark
•  01:21:14 Five things to take away
•  01:23:33 Our conflict of interest, and the book
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Resources:

Buy the book, Signal: https://www.barbellmedicine.com/shop/learning/signal/

• Part 1: Is the testosterone crisis real?
• Part 2: Is you testosterone actually low?
• Part 3: What's actually driving your testosterone down?

New Barbell Medicine Hybrid 5K and 10K Run + Lift Programs

Barbell Medicine coaching and templates: https://www.barbellmedicine.com

Testosterone Action Plan: https://www.barbellmedicine.com/testosterone-action-plan/ 

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2. Baillargeon J, Urban RJ, Ottenbacher KJ, Pierson KS, Goodwin JS. Trends in androgen prescribing in the United States, 2001-2011. JAMA Intern Med. 2013;173(15):1465-1466. doi:10.1001/jamainternmed.2013.6895
3. Bhasin S, Brito J