Testosterone is the primary male sex hormone, essential for sexual function, muscle mass, mood, energy, and sperm production. Low testosterone – known as hypogonadism – is increasingly common and can have a significant impact on fertility. Unfortunately, many men receive treatment that worsens their fertility without realising it.
Symptoms of Low Testosterone
- Decreased libido and erectile dysfunction
- Persistent fatigue and low energy
- Loss of muscle mass and increase in body fat
- Mood changes, irritability, or depression
- Reduced facial and body hair
- Low sperm count or infertility
Types of Hypogonadism
Primary hypogonadism arises from a problem in the testes themselves (e.g., Klinefelter syndrome, undescended testes, chemotherapy, or injury). Secondary hypogonadism is caused by dysfunction in the pituitary or hypothalamus, resulting in reduced stimulation of the testes. Identifying the type is crucial, because treatment approaches differ significantly.
Why Testosterone Replacement Hurts Fertility
Many men with low testosterone are prescribed testosterone gels, patches, or injections. While these improve symptoms, exogenous testosterone suppresses the brain signals (LH and FSH) that drive sperm production. This can lead to severely reduced sperm count or even complete absence of sperm (azoospermia). Men planning to father a child should avoid testosterone replacement therapy.
Fertility-Friendly Alternatives
- Clomiphene citrate: Stimulates the body’s own testosterone production while preserving sperm production.
- hCG (human chorionic gonadotropin): Mimics LH and stimulates testicular function.
- Aromatase inhibitors: Reduce conversion of testosterone to estrogen, improving the testosterone-to-estrogen ratio.
- Gonadotropin therapy (FSH + hCG): Used in secondary hypogonadism to restore sperm production.
Lifestyle Measures
Maintaining a healthy weight, regular exercise (especially strength training), adequate sleep, stress management, and a balanced diet rich in zinc and vitamin D can all support healthy testosterone levels naturally.
Recovery After Stopping Testosterone
If a man has been on testosterone therapy and now wishes to conceive, fertility can often be restored, though recovery may take 6–24 months. A reproductive medicine specialist can design a stimulation protocol tailored to each case.
If you suspect low testosterone and are planning a family, consult a reproductive specialist before starting any hormone therapy. The right approach can treat your symptoms while protecting your fertility.