
What does testosterone actually do?
A foundational men's health guide to testosterone — the hormone behind muscle, libido, bone strength, mood, and more — and why it is not a one-number answer to every health question.
Read the signalEvidence-led men's health guides covering testosterone, DHT, hormone balance, hair loss, fertility, semen analysis, sleep, gym nutrition, and supplement claims — with visible sources and clear non-diagnostic limits.

A foundational men's health guide to testosterone — the hormone behind muscle, libido, bone strength, mood, and more — and why it is not a one-number answer to every health question.
Read the signalEach note shows its confidence level up front, so the design never implies more certainty than the source can carry.


Testosterone and its metabolite dihydrotestosterone (DHT) are both androgens. Their effects — on hair follicles, prostate, skin, and other tissues — depend on receptor activity and tissue-specific biology, not a simplistic good-versus-bad label.

The American Academy of Dermatology identifies topical minoxidil and prescription finasteride as FDA-approved treatments for male-pattern hair loss (androgenetic alopecia), with different timelines, maintenance needs, and possible side effects.
Cornerstone explainers designed to make health information more usable, not more urgent.
05A men's health explainer on why testosterone replacement therapy (TRT) and fertility planning are not interchangeable goals — including sperm production effects, alternative treatments, and why this conversation belongs with a urologist or endocrinologist.
Open file
06A men's fertility health guide to semen analysis: sperm concentration, motility, morphology, and what WHO reference values mean — without turning a single result into a personal diagnosis.
Open file
07A men's health evidence review of testosterone boosting supplements — zinc, ashwagandha, D-aspartic acid, fenugreek, and others — covering study populations, comparators, outcomes, durations, and what most gym supplement labels leave out.
Open file
08Sleep is one of the most impactful natural levers for men's health and hormone balance — but short-term experimental findings are not a universal testosterone promise. Here is what the evidence actually shows.
Open file
Corhack can help you keep the context around sleep, training, meals, and daily tasks in one place. A useful record of a day can help you ask a clearer question; it cannot diagnose a condition, interpret a laboratory result, or replace a qualified clinician.
Track context. Keep the inputs you chose to notice in one personal view.
Ask a better question. Use the pattern as a starting point for reflection or a clinical conversation.
Keep the boundary. Seek qualified care for symptoms, test results, or treatment decisions.