/LEARN
Biomarkers,
peptides,
and protocol notes.
Reference pages for 56 TRT-relevant biomarkers and 87 peptides and compounds. Plus four calculators we actually use ourselves.
Not medical advice. Always consult your physician.
/CALCULATORS
Tools.
Free Testosterone Calculator
Vermeulen equation
Calculate free T from total T, SHBG, and albumin. The gold standard equation.
Testosterone Half-Life Simulator
Peak / trough / steady state
Simulate serum levels across 12 weeks for any ester and any injection cadence.
Lab Snapshot Analyzer
Paste 6 markers, get status
Total T, Free T, SHBG, E2, HCT, PSA → instant in-range / borderline / out status with TRT interpretation.
Dose Volume Calculator
mg → mL conversion
Given concentration (mg/mL) and target dose (mg), what volume do you draw?
Peptide Reconstitution
BAC water, units, mg↔IU
Reconstitute peptides — units per dose, doses per vial, mg/mcg/IU.
/ARTICLES
Long-form.
Honest, detailed walkthroughs of TRT topics. No fluff.
TRT 101: A Plain-English Guide to Testosterone Replacement Therapy
What it is, what to expect, what to track, and what to ignore.
Managing Estradiol on TRT: Targets, Symptoms, and When to Touch an AI
The most over-engineered marker on TRT. Here's what actually matters.
Hematocrit on TRT: When to Worry and What to Do
The most consistent side effect of TRT, with a clear hierarchy of fixes.
TRT and Fertility: How to Preserve Sperm Production on Therapy
TRT crashes fertility for most men. Here's what to do if kids are still on the roadmap.
How to Read Your First TRT Bloodwork Without Panicking
A field guide to the lab report, the headline numbers, and what 'high' and 'low' actually mean.
Subcutaneous vs Intramuscular TRT Injections: What the Evidence Actually Says
SubQ is easier, IM is more familiar, both work. Here's how to choose and how to switch.
Anastrozole Micro-Dosing on TRT: How to Use an AI Without Wrecking Your Estradiol
If you must use an aromatase inhibitor, here's how to do it without crashing into low-E2 problems.
/PEPTIDES
89 compounds.
Peptides, SARMs, SERMs, AIs, and TRT-adjacent compounds with mechanism, half-life, benefits, and side effects.
/MARKERS
56 biomarkers,
categorized.
Click any marker for ranges, causes, and what it means on TRT.
/TESTOSTERONE · Testosterone & Hormones
6 markers/BLOOD · Blood Health (CBC)
9 markers/PITUITARY · Pituitary
3 markers/PROSTATE · Prostate
1 marker/METABOLIC · Metabolic
4 markers/LIPIDS · Lipids
5 markers/THYROID · Thyroid
3 markers/LIVER · Liver
5 markers/KIDNEY · Kidney
3 markers/ELECTROLYTES · Electrolytes
7 markers/INFLAMMATION · Inflammation
2 markers/APP
Track all of these
in the app.
Upload a PDF lab report — Gemini Vision extracts every marker, every range, every unit. Trended over time.