* The study population included men with (i) early morning total testosterone (TT) using LCMS, (ii) free T (FT) measured using equilibrium dialysis, and (iii) who were started on TTH. * Men using intramuscular or topical testosterone face a...
Sex differences play a crucial role in shaping human immune responses, influencing susceptibility to infections, cancer, and autoimmune diseases. Overview of Sex-Based Immune Differences Females generally exhibit more robust immune responses...
I'm 66 and on TRT for 2 years with good results. Wife has been taking estrogen and both wonder if adding some T could help her. Would be Test cyp. From what I've read anywhere from 5-10mgs a week in one shot seems to be what most practices...
How to Prevent and Reverse Erectile Dysfunction: Your Complete Guide to Getting Hard and Staying Strong Bottom Line Up Front: You don't have to accept erectile dysfunction as your new reality. Whether you're dealing with occasional difficulties...
This Beyond Testosterone podcast episode comes from an academic review article from the Asian Journal of Andrology, published in September-October 2025. This article, titled "Regulation of testosterone synthesis by circadian clock genes and its...
I hope you enjoy this part 1. Yes, it is almost 2 hours long but I concentrated everything I know so that you do not have to read for hours. What is low testosterone (hypogonadism) and how is it diagnosed? Low testosterone, or hypogonadism...
Testosterone Therapy in Pre- and Post-Menopausal Women Testosterone Therapy for Women: Indications and Evidence (2010–2025) Low Sexual Desire (HSDD) and Sexual Function Evidence: Multiple randomized controlled studies (RCTs) and meta-analyses...
Meta-regression analysis, using testosterone serum levels as effect of the regression, the years of sample collection as covariates and subjects’ number, age and BMI as co-factors (BMI was available for 742 study groups). Statistical details are...
The selection of carrier oils in testosterone formulations represents a critical yet underappreciated aspect of hormone replacement therapy. This report synthesizes data from pharmaceutical manufacturers, clinical reports, and patient experiences...
* 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...
Dr Michael Eisenberg is a professor of Urology at Stanford, a urologic surgeon, and a leading expert in male fertility and reproductive medicine. It's no secret that global population decline is accelerating, but what's driving it? Male...
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...
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.
List of Peptides, Their Use, and Common Dosages
