The Field Guide
Understand the System You’re Trying to Support.
Straightforward guides to testosterone, performance, sleep, recovery, ingredients and the research behind them.
Built to help you understand what matters, what the evidence says and how the pieces fit together.
Featured guides
Founders’ Notes
There’s Still a Lot Left to Do.
A note from the founders on family, training, recovery and staying capable for everything life still asks of us.
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Performance
Can You Have High Testosterone and Still Feel Tired? Absolutely.
Testosterone is not energy. Why healthy levels and a flat afternoon can coexist, and what the Testosterone Trials found when researchers actually raised it.
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Sleep
Does Sleep Affect Testosterone? Yes — But Not Quite the Way the Internet Says.
Your morning testosterone starts the night before — but the viral “five hours cuts your T by 15%” claim deserves a closer read than it usually gets.
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TRT
TRT Side Effects: What Can Change Early, What Matters Long Term, and What We Still Don’t Know
TRT isn’t the villain. It isn’t a vitamin either. What current evidence says about fertility, hematocrit, blood pressure, cardiovascular risk and the questions still open.
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DEXO vs Mars Men
PRIME / AM head-to-head, research-aligned dosing and why DEXO extends the routine into the night.
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Browse by topic
Testosterone
Hormones, daily rhythm, age, testing and the factors that shape healthy testosterone physiology.
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Performance
Energy, endurance, fatigue resistance, training and the ingredients that support demanding days.
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Recovery
Stress response, physical recovery, readiness and what happens between hard efforts.
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Sleep
Sleep physiology, nighttime recovery and why the night matters for the next day.
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Ingredients
Readable research-led guides to the ingredients used in DEXO and the roles they are designed to support.
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TRT
Clear explanations of testosterone replacement therapy, how it works, where it differs from nutritional support and the questions worth understanding.
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Comparisons
How formulas, doses and approaches differ across natural testosterone, performance, recovery and treatment categories.
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Founders’ Notes
Personal essays on health, performance, family, responsibility and what we’re learning as we build DEXO for the years ahead.
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Latest guides
Founders’ Notes
There’s Still a Lot Left to Do.
A note from the founders on family, training, recovery and staying capable for everything life still asks of us.
Read →
Testosterone
Can Testosterone Levels Fluctuate? Why One Blood Test Can Mislead You
Your testosterone test is a snapshot, not a verdict. What one blood draw can and can’t tell you about your actual testosterone pattern.
Read the guide →
Performance
Can You Have High Testosterone and Still Feel Tired? Absolutely.
Testosterone is not energy. Why healthy levels and a flat afternoon can coexist, and what the Testosterone Trials found when researchers actually raised it.
Read the guide →
Sleep
Does Sleep Affect Testosterone? Yes — But Not Quite the Way the Internet Says.
Your morning testosterone starts the night before — but the viral “five hours cuts your T by 15%” claim deserves a closer read than it usually gets.
Read the guide →
Recovery
Can Training Too Hard Lower Testosterone? The Problem May Be Recovery, Not Effort.
Cardio doesn’t kill testosterone. But chronic training load stacked on insufficient fuel and sleep is a different physiological situation entirely.
Read the guide →
TRT
TRT Side Effects: What Can Change Early, What Matters Long Term, and What We Still Don’t Know
TRT isn’t the villain. It isn’t a vitamin either. What current evidence says about fertility, hematocrit, blood pressure, cardiovascular risk and the questions still open.
Read the guide →