Testosterone & TRT, honestly — treatment vs. hype

Testosterone therapy is legitimate medicine for men with genuine deficiency — and a booming "optimisation" industry for men who mostly aren’t deficient. The honest headline: treat a real, symptomatic, lab-confirmed deficiency; be very sceptical of chasing high-normal numbers for vitality.

What testosterone does — and what "low T" means

Testosterone drives male sexual development, muscle and bone maintenance, red-blood-cell production, libido and aspects of mood and energy. Levels decline gradually with age (roughly ~1% a year from midlife) — a normal, slow drift, not automatically a disease.

True hypogonadism means consistently low testosterone on morning blood tests plus real symptoms (low libido, erectile problems, fatigue, loss of muscle). That combination is treatable and worth treating. A single mediocre reading with vague tiredness is not the same thing — and much of the "low T" marketing blurs that line.

What the evidence supports

For genuine, diagnosed deficiency.

• TRT helps men with true hypogonadism — In men with confirmed low testosterone and symptoms, replacement reliably improves libido, sexual function, mood, and lean mass/bone density. This is real medicine for a real deficiency. (established)
• Diagnose properly before treating — Diagnosis needs repeated morning blood tests (levels swing through the day) plus symptoms — not a single reading or a symptom quiz alone. Treating a number without symptoms is not supported. (established)
• Cardiovascular safety: reassuring in a major trial — A large randomised trial (TRAVERSE) found TRT did not increase major cardiac events versus placebo in middle-aged/older men with low T and cardiovascular risk — reassuring on the long-debated heart question, though it also flagged more atrial fibrillation and some other events. (emerging)

Real trade-offs

• It shrinks fertility (often the deal-breaker) — Exogenous testosterone suppresses the body’s own production and sperm, reducing fertility — sometimes long-term. For men who may want children, this alone can rule out TRT; other approaches exist. (note)
• Thicker blood, and other effects — TRT can raise red-blood-cell count (needing monitoring), cause acne, worsen sleep apnoea, and requires ongoing bloodwork. It’s a commitment, usually lifelong once started. (note)

Where the hype misleads

• “Optimising” normal testosterone for vitality — Clinics selling TRT to men with normal levels for "energy, focus and edge" are selling optimisation, not treatment. Benefits in non-deficient men are unproven, and you take on real risks and lifelong dependence for them. (hype)
• Boosters, tribulus, most “natural T” supplements — Over-the-counter "testosterone boosters" almost never meaningfully raise testosterone. The things that genuinely help normal levels are boring: sleep, resistance training, fixing obesity, and managing stress. (hype)

What we still don’t know

• Long-term effects of lifelong TRT started in midlife TRAVERSE was reassuring over a few years, but multi-decade outcomes of starting TRT in one’s 40s–50s for borderline levels are not fully characterised.
• Where exactly the "treat" threshold should sit The cut-off between normal age-related decline and treatable deficiency is debated, and symptoms overlap with many other causes — so who truly benefits at the margins is unclear.

Key terms

• Testosterone The main male sex hormone, supporting libido, muscle and bone, red blood cells, and aspects of mood and energy.
• TRT Testosterone replacement therapy — supplementing testosterone (gel, injection, etc.) to treat genuine deficiency.
• Hypogonadism A medical deficiency of sex hormones — here, consistently low testosterone with symptoms, the legitimate reason to consider TRT.
• Atrial fibrillation An irregular, often rapid heart rhythm; seen slightly more with TRT in the TRAVERSE trial.
• Sleep apnoea Repeated pauses in breathing during sleep; can be worsened by testosterone therapy.