* They discuss how these clinics often bypass proper lab testing, ignore fertility risks, and prioritize quick prescriptions over patient safety—all under the buzzword of “optimization.” Testosterone therapy is trending—but are clinics...
I am very pleased to announce that I finally finished my full color 427-page booK: Nelson Vergel's "Beyond Testosterone: The Illustrated Guide" and the associated free online resource at Excelmale.com serve as comprehensive guides to...
High Hematocrit Caused by Testosterone Replacement Therapy By Nelson Vergel, B.S.Ch.E., M.B.A. High hematocrit occurs when there is an excessive production of red blood cells. High hematocrit can cause the blood to become very viscous or...
Landmark Study Reveals How Different Testosterone Doses Affect Muscle, Fat, and Health Markers in Young Men A deep dive into one of the most influential studies on testosterone dosing reveals key takeaways for anyone interested in hormone...
13 min summary podcast: Introduction Hello everybody, Nelson Vergel here with ExcelMail.com. ExcelMail.com is a four-year-old forum, online site, with more than 14,000 members. Some of them are doctors, pharmacists, dietitians, exercise...
How U.S. Blood Banks Handle Therapeutic Phlebotomy for Men on Testosterone Replacement Therapy (TRT) Blood centers have had to adapt their policies because the polycythemia/erythrocytosis that often accompanies TRT creates both medical need...
ExcelMale.com Quick Guide: DIAGNOSIS OF HYPOGONADISM: Symptoms and signs suggestive of testosterone deficiency in men: A. More specific symptoms and signs • Incomplete or delayed sexual development, eunuchoidism • Reduced sexual desire...
The occurence of fractures in an elderly population is a significant concern, so this study looked at the relation between the number of fractures and hormone levels, including testosterone. It found fractures were higher at both low and high...
The Vorck Protocol Summary Background: The protocol was developed by a TRT user since 2001 who had difficulty recovering ferritin levels after blood donations. After conducting personal research and consulting with a hematologist in May 2021, he...
Study: Low estrogen can cause problems for men Study: Low estrogen can cause problems for men (2013) Dr. Joel Finkelstein, an endocrinologist at Harvard Medical School and the lead author of a new study, talks about the effects of declining...
Using hCG in Men on Testosterone Replacement Therapy (TRT) – A Clinical Review Introduction Exogenous testosterone replacement therapy (TRT) can profoundly suppress the hypothalamic-pituitary-gonadal (HPG) axis through negative feedback. By...
Thanks to Dr Sun for this diagram. Timeline details (left → right) YearProduct (image above/below the line)Form & delivery 1935-1937No product image—text block below the line: “Testosterone first synthesized” with a bullet list of early...
TRT Hormone Predictor Widget
TRT Hormone Predictor
Predict estradiol, DHT, and free testosterone levels based on total testosterone
⚠️ Medical Disclaimer
This tool provides predictions based on statistical models and should NOT replace professional medical advice.
Always consult with your healthcare provider before making any changes to your TRT protocol.
ℹ️ Input Parameters
Normal range: 300-1000 ng/dL
Predicted Hormone Levels
Enter your total testosterone value to see predictions
Results will appear here after calculation
Understanding Your Hormones
Estradiol (E2)
A form of estrogen produced from testosterone. Important for bone health, mood, and libido.
Too high can cause side effects; too low can affect well-being.
DHT
Dihydrotestosterone is a potent androgen derived from testosterone. Affects hair growth,
prostate health, and masculinization effects.
Free Testosterone
The biologically active form of testosterone not bound to proteins.
Directly available for cellular uptake and biological effects.
Scientific Reference
Lakshman KM, Kaplan B, Travison TG, Basaria S, Knapp PE, Singh AB, LaValley MP, Mazer NA, Bhasin S. The effects of injected testosterone dose and age on the conversion of testosterone to estradiol and dihydrotestosterone in young and older men. J Clin Endocrinol Metab. 2010 Aug;95(8):3955-64.
