WHAT MEN SHOULD KNOW ABOUT TESTICULAR SHRINKAGE AND TESTOSTERONE THERAPY

madman

Super Moderator
If you're considering testosterone replacement therapy, understanding its effects on testicular size is crucial. Learn why shrinkage occurs, the treatments available to mitigate this side effect, and why testicle size usually has minimal impact on your overall health. Urologist John Smith, MD, delves into these aspects to provide a comprehensive view.


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As you can see the abundance of seminiferous tubules/germinal epithelium (where sperm is produced) accounts for 80% of testicular volume.

The use of exogenous testosterone will shut down the HPTA/LH/FSH/iTT (intratesticular testosterone) resulting in atrophy of these tubules.

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Now you can see why atrophy of the testes can be significant in some cases when using/abusing testosterone/AAS.

Fig. 9 Testicular atrophy in a 30-year-old AAS abuser (right) compared to normal size (left)
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Figure 2: Ontogeny of the evolution of testicular volume from birth to adulthood. Seminiferous cords (Sertoli cells + germ cells) are the main component of the testes. From birth and during the prepubertal period (i. e., until 9–14, Tanner stage 1), the volume of seminiferous cords is determined by Sertoli cells, whereas germ cell proliferation determines testicular volume during puberty (i. e., Tanner stages 2 to 5) (adult spermatogenesis). This Figure was modified using BioRender (Scientific Image and Illustration Software | BioRender) under the authorization of[1]. © 2019 Elsevier Ltd

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hCG Mixing Calculator

HCG Mixing Protocol Calculator

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.

DOI: 10.1210/jc.2010-0102 | PMID: 20534765 | PMCID: PMC2913038

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