What We Have Learned from Testosterone Trials

Jinzang

Member
A summary article from The Journal of Sexual Medicine:

The role of testosterone (T) replacement therapy (TRT) in men is still conflicting. In particular, safety concerns and cardiovascular (CV) risk related to TRT have not been completely clarified yet. Similarly, the clear beneficial effects of TRT are far to be established.

A comprehensive PubMed literature search was performed to collect all trials, either randomized controlled trials (RCTs) or observational studies, evaluating the effects of TRT on different outcomes.

Data derived from RCT and observational studies clearly documented that TRT can improve erectile function and libido as well as other sexual activities in men with hypogonadism (total T < 12 nM). Conversely, the effect of TRT on other outcomes, including metabolic, mood, cognition, mobility, and bone, is more conflicting. When hypogonadism is correctly diagnosed and managed, no CV venous thromboembolism or prostate risk is observed.

Before prescribing TRT, hypogonadism (total T < 12 nM) must be confirmed through an adequate biochemical evaluation. Potential contraindications should be ruled out, and an adequate follow-up after the prescription is mandatory.

When correctly diagnosed and administered, TRT is safe, and it can improve several aspects of sexual function. However, its role in complicated vasculogenic erectile dysfunction is limited. Conversely, TRT is not recommended for weight reduction and metabolic improvement. Further well-powered studies are advisable to better clarify TRT for long-term CV risk and prostate safety in complicated patients as well as in those curatively treated for prostate cancer.
 

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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.

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Normal range: 300-1000 ng/dL

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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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