HormonalModerate evidencePrescription only

Testosterone Replacement Therapy (TRT)

Physician-prescribed testosterone substitution for diagnosed deficiency (hypogonadism). Highly effective in true deficiency — but unproven and not risk-free as a 'longevity booster' for men with normal levels.

Also known as: trt, testosteron, testosterone, testosteronersatztherapie

Only under medical supervision

This compound is a prescription drug, or a medication with relevant risks and interactions. We deliberately do not sell it and link no source of supply. Taking it belongs in a doctor's hands — this page is for neutral information only.

Discuss benefits, risks, and dosing with your physician.

How it works

Testosterone replacement therapy delivers testosterone when the body's own production is clinically too low (hypogonadism). The hormone acts via androgen receptors on muscle, bone, libido, mood and metabolism. Very effective in true deficiency, but as lifestyle optimisation in healthy men it carries real risks (e.g. fertility) and needs medical supervision.

Goals
HormonesMuscle & strengthLongevity (broad)
Timing
Any time
Price tier
Premium

Dosage

Form (gel, injection) and dose are set strictly by a physician based on bloodwork and symptoms.

Considerations

Clear indication: symptomatic, lab-confirmed hypogonadism — there TRT markedly improves quality of life, muscle, and bone density. Not a proven longevity tool for men with normal testosterone. Risks: suppression of your own production and fertility, polycythemia (thickened blood), acne; cardiovascular safety is still debated (the TRAVERSE trial was largely reassuring). Requires diagnosis, titration, and monitoring by a physician — self-medication is dangerous.

VeganDrug interactionsNot during pregnancy
Form
TransdermalCapsule

Scientific detail

Mechanisms
Replaces endogenous testosteroneActs on muscle, bone, libido, moodAndrogen-receptor signalling
Evidence base

Studies on Testosterone Replacement Therapy (TRT)

17,872 studies total · Open on PubMed

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Articles on Testosterone Replacement Therapy (TRT)

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