The Evolution of Testosterone Products in the U.S. (1935-2025)

testosterone products timeline.webp


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 preparations (oral 17α-methyltestosterone, injectable esterified, 17β-hydroxy testosterone, subdermal pellets).
1979Depo®-Testosterone (vial & carton)intramuscular injection of testosterone cypionate
1995Androderm® (square purple patch package, shown below the line)transdermal patch
2000Androgel® (blue box)transdermal gel
2014Natestonasal gel
2018Xyosted® (auto-injector pen)subcutaneous injection / autoinjector – testosterone enanthate
2019Jatenzo® (white bottle with orange capsules)oral capsules – testosterone undecanoate
March 2022Tlando® (three identical white bottles)oral capsules – testosterone undecanoate
July 2022KYZATREX® (three bottles in differing strengths with tablets scattered)oral capsules – testosterone undecanoate
 
 
 

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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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