This is one of the most important conversations in TRT — and one that many clinics skip over too quickly. If there's any chance you'll want to father children in the future, it needs to be part of your TRT decision-making before you start, not after.
Why TRT Suppresses Sperm Production
When you introduce exogenous (external) testosterone into your body, the pituitary gland detects it and responds by dramatically reducing its own output of LH (luteinising hormone) and FSH (follicle stimulating hormone). FSH is the key signal that drives sperm production in the testes.
Without FSH signalling, sperm production falls — often to azoospermia (no measurable sperm) within 3–6 months on TRT. This is why TRT was historically investigated as a male contraceptive.
Does Fertility Return After Stopping TRT?
For most men, yes — but not all, and not quickly.
| Time on TRT | Expected Recovery Time | Full Recovery Rate (approximate) |
|---|---|---|
| Under 1 year | 3–9 months | ~90%+ |
| 1–3 years | 6–18 months | ~80% |
| 3–5 years | 12–24 months | ~70% |
| 5+ years | Variable / uncertain | Lower — no reliable data |
These are general estimates. Individual recovery varies significantly based on pre-TRT fertility, age, the specific formulation used, and other health factors. Some men recover quickly; others do not recover at all.
If You Want Children: Your Options Before Starting TRT
✅ Sperm Banking (Recommended for Anyone Undecided)
Before starting TRT, produce a semen sample for cryopreservation at a fertility clinic. This locks in your pre-TRT sperm count as a biological insurance policy. Even if you don't plan children now, your circumstances may change. The cost is modest; the peace of mind is significant.
💊 Alternative Approaches: hCG and Clomiphene
For men with hypogonadism who want to maintain fertility, human chorionic gonadotropin (hCG) can stimulate the testes directly — raising testosterone while preserving some sperm production. Clomiphene (clomid) stimulates the pituitary to produce more LH and FSH. These are specialist decisions and not suitable for everyone, but are worth discussing with your GP.
⏸ Stopping TRT to Conceive
Some men stop TRT temporarily when trying to conceive, banking on recovery. This works for many — but it means returning to low testosterone symptoms for months, with no guarantee of when (or whether) sperm production will recover. Some fertility specialists use hCG alongside TRT withdrawal to accelerate recovery. This approach requires close coordination between your GP and a fertility specialist.
The Conversation to Have Before Starting TRT
At Lambert Medical, we always ask about fertility plans before prescribing TRT. The conversation covers:
- Do you have children? Do you want children in the future?
- Have you had a semen analysis? (Some men have pre-existing fertility issues)
- Would you like a referral for sperm banking before starting?
- Are there alternative approaches (hCG, clomiphene) worth considering first?
None of this means TRT is wrong for you — it means the decision should be properly informed.