Signal is Barbell Medicine’s evidence-based framework for understanding testosterone testing, low testosterone, TRT, and the health factors that shape the signal you’re seeing.
Available June 2026. Choose hardcover, digital PDF/ePub, or the hardcover + digital bundle.
Pre-order bonus: Add the BBM Testosterone Course for $49 at checkout with code SIGNAL49 through June 17.
Price range: $14.99 through $39.00
New from Barbell Medicine
Your testosterone level is a signal. It points at what’s going on underneath the hood: your general health, sleep, body composition, exercise habits, medications, and medical history.
Most low testosterone lab results are not isolated hormone problems. Signal is an evidence-based framework for understanding what your labs are actually telling you, what to do next, and when testosterone therapy is — and is not — appropriate.
Pre-order now. Available June 2026.
Pre-order bonus: Add the BBM Testosterone Course for $49 at checkout, regularly $124.99. Use code SIGNAL49 at checkout with a qualifying Signal pre-order. Available through June 17.
Shipping is calculated at checkout for hardcover orders.
Why Signal Exists
In 1889, a renowned French neurologist injected himself with extract of animal testicles and announced at a medical conference in Paris that he had found the fountain of youth. The press picked it up. A professional baseball pitcher used it before a game and threw a shutout. The Washington Post called it proof.
The extract contained essentially no testosterone. Brown-Séquard was injecting himself with placebo.
More than 135 years later, the testosterone-as-elixir narrative still drives a multi-billion-dollar industry. Men are being medicated for problems they do not have, missing problems they do have, and trying to interpret labs without a clear framework for what those labs actually mean.
Signal is that framework. It was written to help patients, clinicians, coaches, and lifters understand what testosterone levels are actually telling them — and what to do next.
The Problem
The testosterone conversation is full of confident answers. The hard part is knowing whether the right question has been asked in the first place.
Roughly a quarter of testosterone prescriptions written in the U.S. between 2002 and 2013 were initiated without a confirming lab. The drug was started on symptoms alone.
Baillargeon et al., JAMA Internal Medicine, 2015
More than half of men meeting criteria for symptomatic androgen deficiency experienced remission by the next study wave without any intervention.
Travison et al., Journal of the American Geriatrics Society, 2011
In population studies, many men aged 45 and older meet criteria for testosterone deficiency, while only a minority receive treatment.
Mulligan et al., International Journal of Clinical Practice, 2006
Men are being medicated for problems they do not have, missing problems they do have, and trying to make treatment decisions without a clear diagnostic framework. Signal was written to walk through that step at the level of detail it deserves.
Testosterone does not exist in isolation. Signal helps you interpret the lab result in the context of health, training, sleep, body composition, and treatment decisions.
Pre-Order Signal
Signal will be available in June 2026. Choose hardcover, digital, or the bundle if you want both the physical book and searchable digital files.
Choose Your Format & Pre-OrderShipping is calculated at checkout for hardcover and bundle orders.
FAQ
No. Signal is a framework for evaluating whether testosterone therapy is appropriate in the first place, and what to do if it is not.
Most of the book covers what a testosterone result is actually pointing toward: testing issues, sleep, body composition, training, nutrition, medications, medical history, and other underlying drivers. The TRT chapter covers the evidence so readers can make a more informed decision.
Yes. The TRT chapter, monitoring discussion, fertility considerations, and cessation section are especially relevant for people currently using testosterone therapy or thinking about coming off.
The book also covers the broader diagnostic framework, which can help you understand whether testosterone therapy is addressing the underlying issue or only changing the number.
All three. The main text is written for motivated non-clinical readers, while the deeper clinical material is designed to be useful for physicians, NPs, PAs, coaches, and other professionals who help people navigate testosterone questions.
The goal is to give readers a defensible framework they can use in conversation with a clinician, patient, or client.
The hardcover is the physical edition of the book.
The digital edition includes PDF and ePub files delivered when the book releases in June 2026.
The bundle includes both the hardcover and digital edition, and is the best option if you want a physical copy for reading and a searchable digital version for reference.
Both the hardcover and digital editions are expected in June 2026. As the release date gets closer, we may update the page with more specific timing.
Shipping is calculated at checkout based on your address for hardcover and bundle orders. The digital-only option does not require shipping.
Every qualifying Signal pre-order can add the BBM Testosterone Course for $49, regularly $124.99.
The discount applies automatically at checkout when a qualifying Signal pre-order is in your cart. The pre-order bonus is available through June 17.
The podcast series covers many of the conclusions and key pieces of evidence. The book delivers the complete framework, case studies, decision tree, and protocol-level detail.
If you listened to the podcast and want the full system in one place, Signal is where it lives.
Not at launch. If an audio edition becomes available, we’ll announce it separately.
Hardcover orders are covered by a 30-day money-back guarantee. Email support@barbellmedicine.com if you need help with a refund.
Digital downloads are not refundable once delivered.
The hardcover is expected to be available on Amazon after launch. Pre-ordering through barbellmedicine.com gives you access to the launch bonus, bundle pricing, and the digital edition.
The pre-order bonus is only available through barbellmedicine.com and expires June 17.
Pre-order Signal: What Testosterone Levels Are Telling You About Your Health by Jordan Feigenbaum, MD and Austin Baraki, MD.
Choose Your Format & Pre-OrderAvailable June 2026. Pre-order customers can add the BBM Testosterone Course for $49 at checkout through June 17.
| Weight | N/A |
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| Book Type | Digital, Hardcover, Hardcover + Digital Bundle |
