Research library
Testosterone, explained
12 guides, organized by the question you are trying to answer.
Research Guides
Blood tests during Testosterone treatment: what gets checked and why
What labels and guidelines say about testosterone, hematocrit, prostate and blood pressure checks before and during testosterone treatment.
Testosterone cypionate: what the FDA label says
What the testosterone cypionate label says about the drug, its approved uses, dosing range, contraindications, warnings and side effects.
Heart, clots and blood pressure: what the trials and labels measured
What TRAVERSE, FDA actions from 2015 and 2025, and testosterone labels say about heart events, blood clots and blood pressure.
How low Testosterone is diagnosed, and why two morning tests matter
How guidelines and the cypionate label describe diagnosing low testosterone: fitting symptoms plus repeat morning blood tests.
How to read a Testosterone study: who was enrolled and what was measured
Use TRAVERSE, the Testosterone Trials, T4DM and the ACP review to see how enrollment and endpoints shape what a study shows.
Injection, cream and gel: how Testosterone forms differ
How testosterone cypionate injection, testosterone gel and compounded cream differ in use, skin transfer, regulation and blood counts.
Questions to bring to your provider visit
Questions on diagnosis, safety, dose and monitoring to bring to a testosterone visit, each tied to what the label or guideline says.
Symptoms of low Testosterone that other conditions can explain
Low testosterone symptoms are nonspecific. See what the sources say about other causes and why one blood test is not enough.
Testosterone and fertility: what to know before starting
What labels, guidelines and research say about testosterone treatment, sperm production and recovery for men who may want children.
What the Testosterone Trials and the T4DM trial found
What two placebo-controlled testosterone trials measured: sex, mood, energy, bone, plaque, blood sugar and hematocrit.
What the TRAVERSE trial tested, and what it did not
TRAVERSE tested a daily testosterone gel in 5,246 men with heart risk. Here is what it found on heart events, clots, rhythm and fractures.
What "compounded" Testosterone means and does not mean
Compounded testosterone is not FDA approved. Here is what FDA says that means, and how an approved cypionate label compares.
