Testosterone and fertility: what men need to know before starting TRT

Clinically reviewed by Dr. Ponlawat Pitsuwan, Physician, Doctor Bangkok. Last reviewed: July 2026

Most men who come to me about testosterone are thinking about energy, muscle, libido, or mood. Very few are thinking about sperm. That changes fast when someone decides they want children and finds out their sperm count has dropped to almost zero. I see this more than you would expect, especially among expats in Bangkok who started testosterone or anabolic steroids years ago without any fertility conversation.

This article is for any man considering testosterone therapy, already on it, or worried about what past steroid use might have done. You do not need to understand every hormone in the chain. You need to understand the risk, your options, and what to do next.

Your body’s testosterone is not the same as the testosterone you inject

This is the part most people get wrong. Your body makes testosterone naturally, and that process is tied directly to sperm production. When you add testosterone from outside, whether prescribed or from a gym supplier, your brain detects high levels and switches off the signal that tells your testicles to work. Both testosterone production and sperm production slow down or stop.

Taking more testosterone does not help fertility. It does the opposite. Your bloodwork can look completely normal while your testicles have essentially gone quiet.

What actually happens to sperm when you start TRT

Your brain sends two hormones to your testicles: LH (luteinizing hormone) and FSH (follicle-stimulating hormone). Both signals are needed for sperm production. When you take testosterone from outside, your brain senses enough and turns both signals off.

Sperm production can drop fast. A significant proportion of men on TRT reach azoospermia, meaning zero sperm on a semen test, within three to four months. Some show a drop within weeks. Testicular shrinkage is also common with longer-term use.

Is the damage permanent?

Usually not, but the honest answer is: sometimes, yes. Most men who stop TRT and get proper support do recover sperm production. But around one in three men has not recovered adequate sperm counts by twelve months, even with treatment. Some take two years. A smaller number do not recover at all.

Older men recover more slowly. Men who have been on TRT for several years face a harder recovery than those who used it for months. Anabolic steroids from the gym cause exactly the same suppression as prescribed TRT. Many men assume gym-sourced testosterone is somehow different. It is not.

Fertility-friendly alternatives to TRT

If your testosterone is low and you want children now or in the next few years, standard TRT is not the right starting point. There are options that raise testosterone without shutting down sperm production.

Clomiphene citrate is the most commonly used alternative. It stimulates your brain to produce more LH and FSH, which raises your body’s own testosterone and keeps sperm production running. It is taken as a tablet and works well when the problem starts at the brain level rather than the testicles.

Enclomiphene is a refined version of clomiphene. Some men find it causes fewer mood-related side effects and it is becoming more widely used in fertility-focused care.

Human chorionic gonadotropin, hCG, mimics LH directly at the testicles. It can maintain or restart sperm production and is sometimes used alongside TRT or as a bridge when coming off testosterone.

The right choice depends on your hormone panel and your fertility goals. This needs a proper clinical assessment, not a guess. At Doctor Bangkok, we see men at every stage of this decision and can guide you through which option fits your situation.

What to do before you start testosterone therapy

If you are reading this before starting TRT, here is what I recommend. Get a baseline semen analysis before you take anything. It takes about twenty minutes and shows where your sperm count, motility (how well sperm move), and morphology (how they are shaped) stand right now.

Get a full hormone panel at the same time: total testosterone, free testosterone, LH, FSH, and SHBG. This tells us whether low testosterone is coming from the testicles or from a signalling problem higher up.

If there is any chance you want children in the future, ask about sperm freezing before starting. It is a straightforward process and gives you a real safety net if fertility does not recover later. At Doctor Bangkok, we can run your hormone panel and coordinate a semen analysis in a single visit.

Recovering fertility after stopping TRT

If you have already been on testosterone and now want children, the first step is stopping under medical supervision. Do not stop without a plan.

A structured restart typically begins with hCG to restimulate the testicles directly, usually for six to eight weeks. After that, a medication like clomiphene or enclomiphene is introduced to get the full signalling chain working again. LH and FSH usually begin recovering within two weeks of stopping testosterone. Sperm production takes longer, because the full development cycle takes around seventy days.

Most men see meaningful improvement by three to six months. Some take twelve months or more. A semen analysis every three months during recovery tracks progress. If counts are not improving by twelve months, a fertility specialist referral makes sense.

Getting tested in Bangkok

Bangkok has good options for hormone testing and semen analysis. The challenge for most expats is knowing where to go, whether the clinic speaks English, and whether you can get everything done without being sent to three different labs.

At Doctor Bangkok, we handle the hormone panel in-clinic and coordinate semen analysis for you. Our physicians speak English and give you a straight answer. If you are considering starting testosterone, already on TRT, or worried about past steroid use, book a testosterone and hormone consultation with us. We are BTS accessible and can usually see you within a day or two.

FAQ

Can I take testosterone therapy and still have children?

Standard TRT suppresses sperm production significantly and is considered contraceptive by most clinical guidelines. If fathering children is a current or future goal, fertility-friendly alternatives like clomiphene or enclomiphene are a much better starting point than standard TRT. Talk to a doctor before you begin anything.

How long does it take to get my sperm count back after stopping TRT?

Sperm counts usually start improving by three to six months after stopping. Around two thirds of men recover to normal sperm density within twelve months, especially with a structured restart using hCG and a medication like clomiphene. That still leaves around one in three men who have not recovered adequately at twelve months, with older men and long-term users facing a slower recovery.

What testosterone treatments are safe if I want to have children?

Clomiphene and enclomiphene are the first-line choices because they raise your own testosterone without suppressing sperm production. hCG works well for men who need direct testicular stimulation. Standard injectable or topical TRT should be avoided if fertility is a near-term or future goal. A hormone panel will guide which option suits your situation.

Does low testosterone cause infertility even without TRT?

It can. Low testosterone can reduce sperm production, lower libido, and affect erectile function, all of which affect fertility. But a low testosterone number alone does not tell the full picture. A semen analysis alongside a full hormone panel gives a much more complete answer than a blood test on its own.

I used anabolic steroids in the past. Can this affect my fertility now?

Yes. Anabolic steroids suppress sperm production in exactly the same way as prescribed TRT and can cause counts to drop to zero. Recovery after stopping is possible but not guaranteed and can take months to years. A current semen analysis and hormone panel will show where you stand, and supervised recovery with hCG and clomiphene can improve outcomes.

Should I freeze my sperm before starting testosterone therapy?

If there is any chance you want children in the future, yes. Sperm freezing before starting testosterone is a straightforward process and removes a lot of anxiety from the equation if recovery later is incomplete. I recommend it to any man starting testosterone who has not yet completed his family.