Do 5a-Reductase Inhibitors Raise Circulating Serum Testosterone Levels? A Comprehensive Review and Meta-Analysis to Explaining Paradoxical Results

madman

Super Moderator
CONCLUSION

In summary, 5a-RI therapy is not associated with consistent and significant increases in serum T levels. Men with low serum T concentrations may have a greater likelihood of experiencing a rise in serum T with 5a-RI treatment. Based on the very modest increase in serum T in those studies where such a rise was observed, it is unlikely that this change is clinically meaningful. We advance the hypothesis that the rise in serum T in response to 5a-RI therapy, when it occurs, results from re-equilibration of SHBG binding to T, as serum concentrations of 5a-DHT decline.
 

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Predict estradiol, DHT, and free testosterone levels based on total testosterone

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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.

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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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