Signal

Your testosterone number may not be telling you what you think.

Roughly one in four testosterone prescriptions in the U.S. are started without a baseline testosterone test. Men are being medicated for problems they don't have while others go untreated, all trying to read a lab result with no framework for what it means.

Signal gives you that framework. Written by physicians and strength coachesJordan Feigenbaum, MD and Austin Baraki, MD,it treats your testosterone level as a dashboard rather than a driver: a sensitive readout of your sleep, body composition, training, nutrition, medications, and overall health. When the number is genuinely low, that deserves attention. More often, it's pointing at something upstream you can actually fix.

Inside, you'll learn:

• How testosterone testing works, and where it misleads you
• What sleep, visceral fat, training, and medications do to your levels
• When TRT is worth considering, and when it only changes the number
• How to decide what to do next

Understand the signal before you chase the number.