Healthy testosterone levels are essential for men’s physical, sexual, and psychological health. Low testosterone can lead to various health issues that affect quality of life. With studies suggesting nearly 4 in 10 men aged 45 or older have low testosterone — and almost 90% of them are not receiving treatment — men and the medical profession are increasingly recognising the importance of TRT in the UK. So what is testosterone replacement therapy (TRT), and how do you see an expert?
Why is testosterone important?
Testosterone drives the development of male physical and sexual characteristics at puberty. In adult men, adequate levels maintain muscle and bone strength, support sexual health (libido and erections), sustain energy and vitality, support mood and cognition, and help produce the red blood cells that carry oxygen around the body.
How do you know if you have low testosterone?
Low testosterone causes a range of symptoms, including persistent fatigue, stubborn belly fat resistant to diet and exercise, reduced libido, erectile dysfunction, decreased muscle mass and strength, irritability, low mood or anxiety, reduced stamina and exercise performance, less enjoyment of life, difficulty with focus and memory, and disturbed sleep.
If you recognise some of these symptoms, it’s worth getting your testosterone level checked.
How common is low testosterone?
Research suggests that by age 40, up to 1 in 10 men have symptoms of low testosterone; by 50, that rises to about 1 in 5, and it becomes more common again after 60. Average levels have also fallen — men’s testosterone is around 20% lower than it was 20 years ago.
What causes low testosterone?
Levels fall naturally by about 1–2% a year after age 30, but lifestyle has a major impact — obesity, poor diet, inactivity, chronic stress, and poor sleep all lower testosterone. For many men, low levels combine natural ageing with these factors. For some, the cause is genetic or follows injury or infection of the testicles.
Understanding testosterone replacement therapy (TRT)
TRT is a recognised medical treatment that restores testosterone to the normal range and reverses the symptoms of low testosterone. It’s most commonly given as an injection into the belly fat, thigh, or buttock muscle, or as a cream or gel applied to the skin.
What are the benefits of TRT?
There’s now good evidence that TRT benefits men with genuinely low testosterone. Some improvements appear soon after starting; others take longer. Commonly reported benefits include improved energy and stamina, better motivation and mood, increased libido and erection quality, better sleep and brain function, increased muscle mass and bone density, and reduced body fat.
Risks of TRT
Like all treatments, TRT has risks. It can reduce sperm production and impair fertility. It can thicken the blood, raising the risk of blood clots. It can accelerate the growth of an existing prostate cancer. Other possible effects include hair loss, oily skin, and raised blood pressure. This is why TRT should always be doctor-supervised, with the dose carefully titrated and levels monitored to keep risks low — it isn’t something to self-prescribe or buy online without regulation.
TRT and sport: an important warning for athletes
This point matters on a sports medicine site. Testosterone is a prohibited substance in competitive sport under the World Anti-Doping Agency (WADA) code, at all times, in and out of competition. A competing athlete who uses TRT without a valid Therapeutic Use Exemption (TUE) risks a doping ban — even when the testosterone is medically justified for genuine hypogonadism.
If you compete in any sport governed by anti-doping rules, you must not start TRT without first discussing a TUE with a sports physician and your anti-doping organisation. A TUE requires documented evidence of a genuine medical need. If you’re unsure whether your sport is affected, seek advice before starting treatment.
How to get TRT in the UK
TRT is available on the NHS for men with proven low levels, though access can be variable, and some men find awareness of the evidence inconsistent. Many, therefore, seek care privately, where access is often quicker. Whichever route you choose, the key is a proper diagnosis and ongoing monitoring rather than treatment based on symptoms alone.
What happens at the first consultation?
A TRT doctor takes a detailed history, focusing on symptoms of low testosterone, and asks about lifestyle, medications, and past medical conditions. A morning blood test measures testosterone; if it’s low, a second confirmatory test is done. Because TRT affects fertility, the doctor will ask about family planning and discuss ways to preserve sperm production if needed. If TRT is appropriate, they explain the benefits and risks, agree on a personalised plan, and arrange follow-up to monitor progress and side effects.
Is there a natural way to raise testosterone?
If you’d rather not take TRT, several lifestyle steps support natural production.
Nutrition. Lean proteins, healthy fats, and fibre-rich carbohydrates support hormone production. Some supplements may help: vitamin D (2,000–5,000 IU daily, depending on levels), zinc (15–30 mg daily), magnesium (200–400 mg daily), and ashwagandha.
Exercise. Regular activity supports testosterone — it stimulates the pituitary to release LH (which signals the testes), and reduces body fat, which otherwise raises oestrogen and lowers testosterone. Aim for 3–4 sessions a week,k combining weights with aerobic exercise.
Sleep. Testosterone is primarily produced in the early morning, so poor sleep lowers its levels. Aim for 7–8 hours a night on a regular schedule.
Stress. Chronic stress raises cortisol, which suppresses LH and lowers testosterone. Mindfulness, meditation, yoga, breathing exercises, or counselling can help, and ashwagandha may support the adrenal response to stress.
Frequently asked questions about TRT UK.
How much does TRT cost in the UK?
Privately, TRT costs roughly £50–£150 a month, with annual costs (including consultations and tests) of around £500–£1,500. It may be available at a reduced cost or for free on the NH, S, depending on your circumstances. Your GP can arrange a free blood test, and private finger-prick tests can be bought for under £50.
Is TRT legal in the UK?
Yes — TRT is a recognised medical treatment, legal in the UK when prescribed by a registered doctor. (Note the separate point above: legal medically does not mean permitted in competitive sport without a TUE.)
Does TRT help muscle gain?
In men with low testosterone, restoring normal levels supports muscle mass and strength through increased protein synthesis. It’s not a shortcut for men with normal levels, and using it that way carries the risks above (and anti-doping consequences for athletes).
Does TRT increase libido?
Yes — restoring testosterone to the normal range often significantly improves libido and erectile function, as testosterone is central to sexual desire.
Does TRT cause hair loss?
It can, particularly in men genetically prone to male-pattern baldness, by accelerating follicle miniaturisation. Treatments can be used alongside TRT to help limit this.
What is a normal testosterone level?
Generally, a level above 12 nmol/L is considered normal; below 12 nmol/L is low and may benefit from treatment, to be interpreted alongside symptoms and a second confirmatory test.
Can other medications raise testosterone?
Some evidence suggests long-acting erectile dysfunction medication such as tadalafil (Cialis) can modestly raise testosterone while also treating erectile dysfunction.
Final word from Dr Alex Vass on TRT UK
Low testosterone can significantly affect a man’s energy, mood, and sexual health. The evidence shows that TRT effectively relieves these symptoms in men with genuinely low levels, and the risks can be kept low with proper diagnosis, dosing, and monitoring. If you think you have symptoms of low testosterone, get your levels checked and seek appropriate, supervised treatment — and if you compete in sport, take advice on anti-doping rules first.
Dr Alex Vass is a doctor specialising in Lifestyle Medicine and Functional Medicine, with a particular interest in optimising men’s health through lifestyle and hormone therapies.
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