More men are taking testosterone. What gives?

August 19, 2026

AI Summary

5 min read

Testosterone is everywhere right now. Joe Rogan talks about his replacement therapy. Robert F. Kennedy Jr. warns about low T. The military just announced it will begin screening service members for low levels. Online clinics make it easy to get a prescription. But what does the evidence actually say about who needs testosterone, and what it can and cannot do? NPR health correspondent Will Stone brought the research to Short Wave to separate the hype from the physiology.

What testosterone actually does (and doesn't do)

Testosterone is a hormone produced naturally in all human bodies, though men typically have much higher levels. Its role extends well beyond sex drive and male reproductive traits. It is involved in metabolism, bone density, muscle mass, red blood cell production, and brain function. For that reason, experts told Stone, testosterone is an important marker of overall health in men. When levels are genuinely deficient, the consequences can be real: depressed mood, fatigue, reduced libido, weight gain, trouble concentrating, and loss of muscle mass.

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What you'll learn

1 (00:24) **The Rise of Testosterone Talk** - Host Nate Rott introduces the episode, noting the cultural ubiquity of testosterone content from influencers, podcasters, and figures like Joe Rogan and Health Secretary Robert F. Kennedy Jr., who hype "low T" fears and "T-maxing."
2 (01:44) **What Is Testosterone?** - Stone explains testosterone is a hormone produced naturally in all humans, but men have higher levels on average, responsible for male sex traits and reproductive organs.
3 (04:05) **The Vague Symptoms of Low T** - Stone lists common symptoms: depressed mood, fatigue, reduced libido, weight gain, trouble concentrating, and loss of muscle mass.
4 (05:44) **Marketing vs. Medicine** - Stone describes how testosterone is marketed online, playing into masculinity and biohacking themes, framing it as a performance enhancer or fountain of youth.
5 (07:05) **Who Should Actually Take Testosterone?** - Testosterone therapy is currently only approved for men with low levels from an identifiable medical condition, like genetic disorders or pituitary gland issues.
6 (08:13) **The History of Testosterone and Heart Risks** - In the early 2000s, testosterone use surged with topical gels and aggressive "low T" marketing, becoming one of the fastest-growing prescription drugs.
7 (09:36) **Caveats from the Lead Investigator** - Dr. Steven Nissan, the TRAVERSE lead investigator, emphasizes the study used a specific protocol: a gel, given to middle-aged and older men, restoring levels to normal.

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Guests on this episode

Will Stone Jamin Brahmbhatt

Show Notes

If you’re a guy – or even just friends with a guy – and on the Internet, you may have noticed that testosterone discourse is everywhere. There’s Defense Secretary Pete Hegseth announcing testosterone screenings for soldiers, Joe Rogan discussing hormone therapy, and influencers discussing high- and low-T levels. Those levels affect more than just sex. They also affect metabolism, bone health, muscle mass, red blood cell production and brain function. NPR science reporter Will Stone took a deep dive into it all: What deficiency looks like in men, what doctors recommend and what the research says about who actually needs testosterone replacement therapy.

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