Hormonal Health
Testosterone Replacement Therapy (TRT): A Complete Guide for Men
Haute MD Editorial Team
Testosterone replacement therapy (TRT) is physician-supervised treatment that restores testosterone to optimal physiological levels in men with documented deficiency and related symptoms. It is not a performance-enhancing drug program — it is a medical treatment for hypogonadism (clinically low testosterone) that affects an estimated 2-4% of men, with prevalence rising significantly with age. TRT requires proper diagnosis (two morning testosterone measurements below the laboratory reference range, plus symptoms), ongoing monitoring, and individualized dosing. It is not appropriate for men without documented deficiency.
Delivery methods compared
Intramuscular or subcutaneous injections (testosterone cypionate or enanthate, weekly or every two weeks) — the most cost-effective option, produces predictable levels, requires self-injection or clinic visits. Topical gels and creams (AndroGel, Testim, Vogelxo) — applied daily to shoulders or thighs, convenient but carries risk of transfer to partners and children through skin contact. Subcutaneous pellets (Testopel) — inserted every 3-6 months, provides stable levels without daily application. Oral testosterone (Tlando, Jatenzo) — newer FDA-approved options, taken with food, convenient but more variable absorption.
What to monitor on TRT
Every 3-6 months — total and free testosterone (target typically mid-to-upper normal range), hematocrit (testosterone stimulates red blood cell production — values above 54% warrant dose reduction or phlebotomy), estradiol (testosterone aromatizes to estrogen — elevated estradiol causes water retention, mood changes, gynecomastia), PSA (in men over 40 — TRT does not cause prostate cancer but may accelerate pre-existing disease), lipid panel, and metabolic panel. Annual — prostate exam in appropriate age groups.
Effect on fertility and what to do about it
TRT suppresses the hypothalamic-pituitary-gonadal (HPG) axis, reducing LH and FSH — the hormones that stimulate sperm production. Most men on TRT have significantly reduced or absent sperm counts within months of starting. For men who want to preserve fertility, alternatives include clomiphene citrate (Clomid) or human chorionic gonadotropin (hCG) — both stimulate the body's own testosterone production without suppressing the HPG axis. Discuss fertility goals explicitly with your prescribing physician before starting TRT.
Frequently Asked Questions
Am I a candidate for TRT?
Candidates for TRT have two morning total testosterone measurements below the laboratory reference range (typically below 300 ng/dL) plus symptoms of deficiency (fatigue, low libido, erectile dysfunction, mood changes, difficulty building muscle). Symptoms alone, or borderline testosterone without symptoms, generally do not meet criteria for treatment.
What's the difference between TRT injections and gel?
Injections (weekly) produce predictable testosterone levels at lower cost ($20-50/month for cypionate) but require self-injection. Gel (daily) is more convenient but costs significantly more ($200-600/month brand name; compounded gel is cheaper), has transfer risk, and can produce more variable levels. Most experienced TRT physicians prefer injections for consistency and cost-effectiveness.
Does TRT affect fertility?
Yes. TRT suppresses sperm production by reducing LH and FSH. Most men on TRT are effectively infertile while on treatment. Fertility typically recovers after stopping TRT, though recovery can take months to over a year. Men planning to father children should discuss alternatives (clomiphene, hCG) with their physician before starting TRT.
How quickly will I feel results from TRT?
Sexual function (libido, erectile quality) typically improves within 3-6 weeks. Energy and mood improvements are often noticed at 3-6 weeks as well. Body composition changes (reduced fat, increased muscle) take 3-6 months of consistent treatment. Sleep quality improvement is often one of the earliest noticeable benefits.
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