How to get testosterone replacement therapy in the UK

Testosterone replacement therapy is one of the most searched-for and least well-explained treatments in UK men's health. Most men arrive at it after months of feeling flat, foggy and unmotivated, usually after a GP appointment that ended with a blood result described as normal and no further action.

This guide covers the whole picture: what the treatment is, how deficiency is diagnosed here, both routes to getting it, real costs, the law, and what long-term monitoring should involve.

What TRT is and what it treats

Testosterone replacement therapy restores testosterone to a healthy physiological level in men whose bodies are no longer producing enough of it. The clinical name for that deficiency is male hypogonadism.

It is a replacement therapy, not an enhancement. The goal is to bring a deficient man back to the levels a healthy man of his age would have, and to resolve the symptoms that deficiency was causing. That is a different thing entirely from the supraphysiological doses used in performance enhancement, and any clinic that blurs the two is not practising medicine.

Hypogonadism splits into two categories, and the distinction changes what should happen next.

Primary hypogonadism

The testicles are not producing testosterone despite the brain signalling correctly. Luteinising hormone and follicle stimulating hormone come back high, because the pituitary is signalling to a gland that cannot respond. Causes include Klinefelter syndrome, prior mumps orchitis, testicular injury, chemotherapy and undescended testes.

Secondary hypogonadism

The signal itself is missing. LH and FSH come back low or inappropriately normal, so the testicles are never told to produce. Causes include pituitary adenoma, obesity, obstructive sleep apnoea, opioid use, previous anabolic steroid use, chronic illness and severe undernutrition.

Symptoms of low testosterone

Low testosterone rarely announces itself. It arrives as a gradual subtraction, which is why so many men put it down to age, stress or work.

• Persistent fatigue that sleep does not fix
• Reduced libido and fewer spontaneous morning erections
• Erectile difficulty, particularly alongside normal desire
• Loss of muscle mass and strength despite unchanged training
• Increased body fat, especially around the abdomen
• Low mood, irritability and reduced tolerance for stress
• Difficulty concentrating, which most men describe as brain fog
• Poor sleep quality
• Reduced motivation and drive

Reduced morning erections, low libido and loss of body hair are the symptoms most specifically linked to testosterone deficiency rather than to something else. Fatigue and low mood are real symptoms, but they are also caused by thyroid disease, iron deficiency, depression and sleep disorders. That is exactly why symptoms alone cannot diagnose this, and why a comprehensive panel rather than a single testosterone reading is the right starting point.

• Brain fog
• Energy levels
• Sex drive
• Erectile issues
• Low mood
• Anxiety
• Muscle mass
• Weight gain
• Sleep quality

TRT blood tests: how low testosterone is diagnosed in the UK

UK practice follows the British Society for Sexual Medicine guidelines, supported by the Endocrine Society's clinical practice guideline. Both set out the same core requirements.

Two morning samples, not one

Testosterone follows a daily rhythm and peaks in the early morning. A sample taken at 4pm can read several nmol/L lower than one taken at 8am from the same man on the same day. Diagnosis requires two separate fasting samples taken before 11am, ideally before 10am, on different days.

A single afternoon test is not a diagnosis. It is also, unfortunately, how a large number of men are wrongly reassured that they are fine.

The thresholds

The grey zone is where most of the real clinical work happens, and it is where free testosterone matters. Most testosterone in your blood is bound to sex hormone binding globulin and is biologically unavailable. A man with high SHBG can have a total testosterone of 14 nmol/L and a free testosterone that is frankly deficient. If nobody measures SHBG, that man gets told he is normal and sent home.

What a proper panel includes

A defensible assessment measures, at minimum:

• Total testosterone
• SHBG and calculated free testosterone
• Albumin
• LH and FSH, to separate primary from secondary
• Prolactin, to exclude a pituitary cause
• Oestradiol
• Full blood count, particularly haematocrit as a baseline
• Thyroid function
• HbA1c and lipids
• PSA in men over 40
• Ferritin and vitamin D

The purpose of the wider panel is not upselling. It is to find the conditions that mimic low testosterone, and to establish the baselines you will be monitored against for years.

Getting TRT on the NHS

Low testosterone treatment is available on the NHS, and it is free at the point of use aside from standard prescription charges. For men with clear-cut deficiency it is a legitimate route and should not be dismissed.

The practical difficulties are consistent:

• Getting tested at all. Low testosterone is not part of routine screening. You will usually need to ask specifically, and to ask for a morning sample.
• Threshold interpretation. Laboratory reference ranges are wide, often quoted as roughly 8 to 30 nmol/L, and are not age-adjusted. A result of 9 nmol/L is flagged as within range. For a symptomatic 34 year old, it is not remotely normal for him.
• SHBG is frequently not measured, so free testosterone is never calculated.
• Referral waits. Most GPs will not initiate treatment without endocrinology input, and waiting lists in much of England currently run from several months to over a year.
• Limited formulary. Prescribing tends toward three-monthly long-acting injection or daily gel. More frequent, smaller dosing is generally not offered.
• Monitoring frequency. Reviews are typically annual once you are stable.

Private TRT in the UK: how the pathway works

Private clinics exist because of the gaps above, not because the NHS is wrong. The differences are speed, protocol flexibility and monitoring frequency. A well-run private pathway looks like this.

1. Initial blood testUsually a home finger-prick kit, sometimes a venous draw at a partner clinic or by a visiting nurse.
2. Doctor reviewYour results are interpreted against your symptoms, not against a lab range in isolation.
3. Confirmatory testA second morning sample plus the wider panel. Two low readings before treatment is considered. Be suspicious of any clinic that skips this.
4. Clinical consultationBenefits, risks, fertility implications, delivery options and cost, with time to think. This is also where reversible causes are ruled out.
5. Treatment and titrationIf appropriate, treatment begins with instruction on safe administration.
6. Six to eight week reviewRepeat bloods to see how you have actually responded, and adjust the protocol accordingly.
7. Ongoing monitoringTypically every six to twelve months once stable, covering haematocrit, PSA where indicated, oestradiol and blood pressure.

From first test to first dose usually takes two to four weeks.

NHS vs private, side by side

Neither route is universally correct. If your testosterone is 5 nmol/L, the NHS will treat you and it will cost you nothing. If you are at 10 nmol/L with high SHBG, significant symptoms and a free testosterone calculation nobody has done, the NHS route will most likely end in reassurance rather than treatment.

What TRT costs in the UK

Private TRT generally falls between £99 and £200 per month, with most established clinics clustering between £120 and £180. Initial diagnostics sit on top of that.

Before comparing headline monthly prices, check what is actually included, because this is where clinics differ most:

• Are follow-up consultations included, or charged per appointment?
• Are monitoring blood tests included, and how many per year?
• Is medication included or billed separately?
• Are adjuncts such as hCG charged as extras?
• Is there a joining fee or a minimum term?
• What does it cost to change your protocol?

Is TRT legal in the UK?

Yes, with one important condition.

Testosterone is a Class C controlled substance in the UK and a prescription-only medicine. It is entirely legal to be prescribed it, to possess it, and to import it for personal use when it has been prescribed to you by a registered doctor.

It is illegal to supply it to anyone else, and supply carries a maximum sentence of fourteen years and an unlimited fine. Buying testosterone from an underground lab, a gym source or an overseas website without a prescription means no assurance of what is in the vial, no sterility, no dose accuracy, and no monitoring of your haematocrit or blood pressure. The complications of unmonitored testosterone use are not theoretical.

Two further points worth knowing

Sport. Testosterone is on the World Anti-Doping Agency prohibited list. If you compete under a WADA-affiliated body you cannot use TRT without a Therapeutic Use Exemption, and these are granted rarely and only for well-documented organic hypogonadism.

Driving and work. TRT does not affect your licence and does not need to be declared to most employers, though it will show on a testosterone-inclusive drug screen.

Self-prescribing TRT in the UK

A significant number of UK men are using testosterone without a prescription. Most did not set out to. They asked their GP, were told a result of 9 nmol/L was normal, waited months for a referral that never came, and eventually found a website that would sell them a vial without asking questions.

That is a failure of the pathway before it is a failure of judgement, and it is more useful to be straightforward about the risks than to moralise about them.

What you are actually buying

Testosterone sold without a prescription in the UK comes from underground labs or overseas suppliers operating outside any regulatory system. There is no assurance of what the vial contains, at what concentration, or whether it is sterile. Dose accuracy is verified by nobody. Products testing well below or well above their stated concentration are common, which means a man carefully injecting what he believes is 100mg may be taking half that, or double.

What monitoring catches and self-prescribing does not

The genuine dangers of testosterone use are mostly silent and mostly detectable on a blood test. Without one, none of them are visible until they cause a problem.

• Haematocrit. The most common reason a dose needs reducing. Rising red cell concentration thickens the blood and raises clot risk, and it produces no symptoms at all until it is significant.
• Blood pressure. Can climb steadily without being noticed.
• Oestradiol. Properly managed by adjusting dose and frequency. Men self-medicating often reach instead for aromatase inhibitors bought alongside the testosterone, and over-suppressing oestrogen causes joint pain, low libido and bone density loss.
• Fertility. Suppressed from the first weeks. Men who were never told this and wanted children later are among the more distressing presentations in this field.
• The undiagnosed cause. If a pituitary tumour, thyroid disease or sleep apnoea is driving the low testosterone, self-medicating masks the symptom and leaves the cause untreated.

Where the law sits

Possessing testosterone prescribed to you is lawful. Buying it without a prescription means obtaining a prescription-only medicine outside the regulated supply chain. Passing any of it to someone else, including a friend or a training partner, is supply of a Class C controlled substance and carries a maximum sentence of fourteen years.

If you are already doing this

Two things are worth knowing. Stopping abruptly is not a safe correction: your own production is suppressed, and coming off without a structured protocol usually means weeks of feeling considerably worse than before you started. And no reputable clinic will refuse to see you over it. Doctors working in this field see it regularly.

What matters clinically is getting a full panel done, finding out what your haematocrit and blood pressure are actually doing, and establishing whether you needed treatment in the first place. Bring what you have been taking and how much. Being straight about it changes the clinical picture entirely.

Testosterone injections in the UK

Injections are the most widely used form of testosterone replacement in the UK, on the NHS and privately. The important choice is less about the needle than about how often you inject, because frequency determines how stable your levels stay between doses.

Short and medium-acting esters

Testosterone enantate, cypionate and propionate are given weekly, twice weekly or more frequently. Smaller, more frequent doses produce flatter levels and fewer mood and energy swings than large infrequent ones. This is the approach most private clinics use, because it can be titrated precisely against your bloods.

Long-acting injection

Testosterone undecanoate is given roughly every ten to fourteen weeks. It is convenient and it is the standard NHS option. The trade-off is a pronounced peak in the days after administration and a trough in the final weeks before the next dose. Some men are entirely comfortable on it. Others describe the last fortnight of each cycle as a return to how they felt before treatment started.

Intramuscular or subcutaneous

Intramuscular injection into the thigh or buttock is the traditional route. Subcutaneous injection into abdominal fat using a short insulin needle is now widely used, achieves comparable levels, and most men find it considerably more comfortable. Both are straightforward to self-administer once you have been shown properly.

What comes with it

Whichever ester and frequency you use, the monitoring is the same: full blood count for haematocrit, a hormone panel including oestradiol, blood pressure, and PSA where indicated. Injection technique should be taught rather than assumed, and sharps need a proper disposal bin rather than household waste.

Other treatment options

Injections are not the only route, and for some men they are not the right one.

Transdermal gels and creams

Applied daily to the skin. Needle-free and easily adjusted, but absorption varies significantly between individuals and there is a transference risk to partners and children through skin contact.

Oral options

Modern oral formulations avoid the liver toxicity associated with older 17-alpha-alkylated orals. Taken with food, twice daily, and suitable for some patients depending on clinical profile.

hCG

Human chorionic gonadotropin mimics luteinising hormone and can help maintain testicular function and some natural production during therapy. Commonly used where fertility preservation or testicular volume matters. Response varies between individuals.

Is TRT safe?

Properly monitored, TRT has a good safety record. Unmonitored, it carries real risk. The difference is entirely in the monitoring.

Cardiovascular risk

This was the dominant concern for a decade. The TRAVERSE trial, published in 2023, randomised over 5,000 men with hypogonadism and cardiovascular risk factors, and found testosterone therapy non-inferior to placebo for major adverse cardiac events. It did note higher rates of atrial fibrillation, acute kidney injury and pulmonary embolism, which is why baseline assessment matters.

Haematocrit

Testosterone stimulates red blood cell production. A meaningful proportion of men see haematocrit rise, and if it climbs too high, blood viscosity increases and so does clot risk. This is the most common reason to adjust a dose, and it is picked up only by regular full blood counts. Any clinic not checking this routinely is not monitoring you properly.

Blood pressure

Can rise on therapy. Home monitoring should be part of your routine, not an afterthought.

Prostate

The idea that testosterone causes prostate cancer originates in research from the 1940s conducted in a very small number of men, and has not been supported by subsequent evidence. Current guidance does not consider TRT to cause prostate cancer. PSA is still monitored, and active prostate cancer remains a contraindication.

Oestrogen

Some testosterone converts to oestradiol, and some conversion is necessary for bone density, libido and mood. Symptomatic elevation can cause water retention or breast tenderness, and is managed by adjusting dose and frequency first, with medication only where genuinely needed. Aggressive oestrogen suppression causes its own problems.

Skin and sleep

Acne and oilier skin are common in the first few months and usually settle. Existing sleep apnoea can be worsened by therapy and should be identified and treated beforehand.

TRT and fertility

Exogenous testosterone suppresses the hypothalamic-pituitary-gonadal axis. Your brain stops signalling, LH and FSH fall, and sperm production falls with them. For many men this reverses within six to twelve months of stopping, but recovery is not guaranteed and becomes less certain with longer duration of use and increasing age.

Options include hCG alongside therapy to maintain testicular function, sperm banking before starting, or alternative approaches such as clomifene or hCG monotherapy, which can raise testosterone while preserving fertility in men with secondary hypogonadism.

Any clinic that does not ask about your fertility plans during the initial consultation should be avoided. Read more on TRT and fertility.

How long TRT takes to work

Different symptoms respond on different timelines, which is why the first three months can feel uneven.

The first six to twelve weeks are a titration period, not a verdict. Dose and frequency usually need adjusting once your first set of follow-up bloods comes back.

How to choose a UK TRT clinic

A checklist you can apply to any provider, including this one.

• Is it CQC registered? Verify it on the CQC website. Registration is a legal requirement for regulated clinical activity in England.
• Are the doctors GMC registered and named? You should be able to look each one up on the GMC register by number.
• Is the pharmacy GPhC registered?
• Do they require two low morning tests before treating? If one test gets you a prescription, that is a sales process, not a diagnostic one.
• Do they measure SHBG and free testosterone?
• Do they investigate reversible causes before prescribing?
• Do they ask about fertility?
• How often do they monitor haematocrit?
• Is dosing flexible, or is everyone on the same protocol?
• What is the twelve-month total cost, including consultations, bloods and medication?
• Can you speak to the same doctor, or is it a different clinician each time?
• How do they handle exit? A clinic confident in its treatment will give you a cessation protocol without friction.

Can you stop TRT?

Yes. You are not locked in.

Because therapy suppresses your natural production, stopping abruptly usually means a period of symptoms worse than where you started, while your own axis restarts. A structured cessation protocol, sometimes using hCG or a selective oestrogen receptor modulator, supports that restart and makes the process considerably more comfortable.

Recovery of natural production takes anywhere from a few months to over a year, depending on duration of use, age, and what your baseline production was before you started. For men with genuine primary hypogonadism, natural production was never adequate and will not become adequate. For those men, TRT is a long-term treatment for a chronic deficiency, in the same way thyroid hormone replacement is.

Never stop without medical supervision, and never stop by simply not renewing your prescription.

Frequently asked questions