Archive
Research
Evidence reviews on male hormonal health. Every claim is sourced, and we state where the evidence is weak as clearly as where it is strong.
Population Research
Men's Testosterone Has Fallen Across Generations. What the Data Actually Shows
Serum testosterone declined across successive birth cohorts, independent of age and BMI.
Clinical Review
TRT and Natural Support Are Not the Same Decision
One replaces the hormone and suppresses the system that makes it. The other supports that system.
Clinical Review
How Testosterone Is Actually Measured, and Why One Result Means Little
Total, free, SHBG and LH each answer a different question. What to ask for and when to test.
Clinical Review
The Symptoms Attributed to Low Testosterone, and How Non-Specific They Are
Only three symptoms held up as independently associated in the largest study of the question.
Sleep Physiology
Sleep and Testosterone: What One Week of Restriction Actually Does
Restricting healthy young men to five hours a night reduced daytime testosterone by 10 to 15%.
Consumer Guidance
Six Label Practices That Make a Dose Impossible to Verify
Proprietary blends, herb-equivalent dosing and unstandardized extracts are all legal.
Ingredient Evidence
Ashwagandha and Cortisol: What the Human Trials Support
One of the few botanicals here with replicated randomized evidence.
Ingredient Evidence
Tongkat Ali: Why Standardization Determines Whether the Dose Means Anything
The trials were run on extracts standardized to eurycomanone.
Ingredient Evidence
Zinc, Magnesium and Vitamin D: The Deficiency Correction Pattern
Correcting a deficiency produces measurable change. Supplementing beyond sufficiency does not.