TRT in the UK: Everything You Need to Know

Testosterone replacement therapy (TRT) is increasingly accessible in the UK, but information is fragmented. You'll get contradictory advice from the NHS, confusing pricing from private clinics, and conspiracy theories on forums.

This is the practical guide. When to consider TRT, how each route works, what it costs, what compounds do, and what to realistically expect.

What Is TRT and Who Needs It?

Testosterone replacement therapy is the clinical administration of testosterone to men (and less commonly women) with clinically low testosterone who haven't responded to lifestyle intervention.

Symptoms of low testosterone:

Persistent fatigue despite good sleep
Reduced libido and erectile dysfunction
Difficulty building or maintaining muscle
Mood depression, anxiety, or irritability
Brain fog and poor concentration
Reduced sense of well-being

Important: Symptoms alone don't justify TRT. Bloodwork must show low testosterone. The threshold is below 10 nmol/L (roughly 290 ng/dL in US units).

Getting bloodwork: Before pursuing TRT, get comprehensive testing:

Total testosterone — crude; SHBG affects interpretation
Free testosterone — active form; better clinical indicator
SHBG — high SHBG can lock testosterone away, falsely lowering "free" levels
LH and FSH — if low, points to secondary hypogonadism (pituitary problem); if high, points to primary hypogonadism (testicular problem)
Prolactin — elevated prolactin suppresses testosterone
Oestradiol — important for bone and mood; must be monitored on TRT
Full blood count, liver and kidney function — baseline safety

Get tested twice over 2-4 weeks; testosterone fluctuates. One low result doesn't mean TRT is indicated.

The NHS Route

How to Access

Speak to your GP about symptoms and low testosterone
If GP agrees, request referral to endocrinology (or occasionally urology or sexual health)
Wait list: typically 6-12 months depending on region
Endocrinologist reviews your case, repeats bloodwork, and decides on treatment

What to Expect

Most NHS endocrinologists are cautious; the bar for TRT is genuinely low testosterone with clear symptoms
You'll get counselled on benefits and side effects
Initial monitoring is reasonable (bloodwork every 6-12 weeks for the first year)

Compounds Offered

Nebido (testosterone undecanoate, 1000mg IM every 12 weeks) — the gold standard for NHS. Long-acting, minimal side effects, but erratic absorption initially
Testogel (transdermal testosterone, 50-100mg daily) — convenient, but costly (£100+ monthly on NHS budget)
Sustanon (mix of testosterone esters, IM weekly/fortnightly) — older option, less common now

Limitations

Long waits; you might wait 12+ months whilst symptoms persist
Limited flexibility; the NHS uses standard doses and protocols
Monitoring can be basic; some areas don't check oestradiol or SHBG regularly
Side effect management is often poor; if you develop mood changes or other issues, the response is often to stop rather than adjust

Cost — Free on NHS, but it costs time.

The Private Route

Private TRT clinics in the UK have exploded in the last 5 years. Quality varies wildly; choose carefully.

How to Access

Choose a clinic (see below)
Book a consultation (£150-300)
Order bloodwork (often included)
Clinic prescribes and monitors
You source testosterone (usually via their pharmacy or a legitimate supplier)

Cost Breakdown

Consultation: £150-300
Initial bloodwork: £150-300 (often bundled with first consultation)
Ongoing bloodwork: £100-200 per round (typically every 6-8 weeks initially, then 12 weeks)
Testosterone: £20-60 monthly (injectable cheaper than topical; enanthate/cypionate cheaper than Nebido)
Total ongoing: roughly £150-250/month with regular bloodwork

Good Private Clinics

Optimal Health — Established, science-focused, regular monitoring, typically cypionate or enanthate, £100-150/month
Securely — Digital-first, flexible protocols, responsive to patient feedback, £120-180/month
The Male Doctor — Good protocols, but pricier at £180-250/month
Balance My Hormones — Straightforward, reasonable pricing, mixed reviews on responsiveness

See UK TRT Clinics Compared: Cost, Protocol, and Quality for detailed breakdowns.

Advantages

Fast access (weeks, not months)
Flexible dosing and protocols
Better side effect management; clinicians adjust rather than stop
More sophisticated monitoring (oestradiol, SHBG, haematocrit)
Support from clinicians who specialise in TRT (vs generalist endocrinologists)

Disadvantages

Cost (£1500-3000 annually)
You're responsible for choosing; bad clinics exist (some just prescribe high doses and don't monitor)
Less regulated than NHS (though legitimate clinics are still professional)

TRT Compound Profiles

Testosterone Enanthate or Cypionate

The most common choice for private TRT in the UK. Both are synthetic esters; cypionate is marginally more stable.

Dose: 50-100mg weekly (split 25-50mg twice weekly if prone to side effects)
Route: Subcutaneous or intramuscular injection (you inject yourself)
Onset: 3-5 days to peak, week to steady state
Half-life: ~5 days; you feel peaks and troughs if dosed weekly (good reason to split doses)
Cost: £20-40 monthly
Pros: Flexible, cheap, you control frequency, widely available
Cons: Requires injections; more frequent bloodwork needed initially

See Testosterone Cypionate: Profiles, Dosing, and UK Protocol and Testosterone Enanthate: Full Breakdown.

Nebido (Testosterone Undecanoate)

Long-acting. Popular on NHS; increasingly used privately.

Dose: 1000mg IM every 12 weeks
Onset: Slow; levels take 6-8 weeks to stabilise
Half-life: ~90 days
Cost: £80-150 per injection (expensive but infrequent)
Pros: Infrequent dosing; no patient injections (clinic does it); stable, steady levels
Cons: Slow to titrate; if side effects develop, you're stuck for 12 weeks; not ideal for first-time TRT users

Testogel (Transdermal)

Topical testosterone gel applied daily.

Dose: 50-100mg daily (typically two 50mg sachets)
Onset: Hours to peak
Route: Skin application (rub onto arms/shoulders)
Cost: £120-180 monthly
Pros: No injections; stable daily dose; easy to adjust
Cons: Expensive; messy (can transfer to partners); variable absorption; less reliable than injections

Monitoring and Side Effects

Proper TRT includes regular bloodwork. Non-negotiable parameters:

Total and free testosterone — verify you're in optimal range (15-25 nmol/L free testosterone is typical)
Oestradiol — testosterone converts to oestrogen; too high causes water retention and breast tenderness; too low affects mood and bone health. Aim for 40-60 pg/mL
Haematocrit and haemoglobin — TRT increases red blood cells; excessive levels increase clot risk. Aim for <50%
Liver and kidney function — baseline safety
PSA — controversial, but monitored to watch for prostate issues (risk is overstated but real)

Common side effects and management:

Acne: Usually mild; improve with good skin care. If severe, lower dose or add finasteride
Breast tenderness/swelling: Oestradiol too high. Add an aromatase inhibitor (anastrozole 0.5mg twice weekly) or lower testosterone dose
Mood changes: Can swing either direction. Usually resolves with dose optimisation or adjusts within 4-6 weeks
Reduced libido: Paradoxically, can happen if oestradiol is too low or too high. Rebalance
Polycythaemia (high red blood cell count): Monitor haematocrit. Donate blood if >52%, or lower dose
Fertility: TRT suppresses sperm production. If you plan children, discuss HCG (human chorionic gonadotropin) before starting. See HCG and Fertility on TRT

The Practical Process

Months 1-3: Initial Phase

Bloodwork at baseline, week 4, week 8
Start conservative (50-75mg weekly for enanthate/cypionate)
Assess mood, energy, libido, and side effects
Adjust based on bloodwork and symptoms

Months 3-6: Optimisation

Bloodwork every 6-8 weeks
Fine-tune dose to get free testosterone 15-25 nmol/L, oestradiol 40-60 pg/mL
Most men settle at 75-100mg weekly

Beyond 6 Months: Maintenance

Bloodwork every 12 weeks
Stable dose; minor adjustments only if symptoms change
Ongoing monitoring; TRT is lifelong once you start

Common Misconceptions

"TRT will make you aggressive" — False. Aggression occurs with very high doses (supraphysiological steroids, not TRT) or with oestradiol imbalance. Most men report improved mood.

"TRT ruins your natural production" — True, it does suppress it. But if you had low testosterone to begin with, suppressing the (broken) signal isn't a loss. You can use HCG to maintain fertility.

"TRT will give you cancer" — Unfounded. Decades of clinical data show no increased cancer risk at replacement doses. Prostate issues are overstated; monitor PSA, don't panic.

"You'll be on it forever" — Yes, if you start. Your natural production takes months to recover, and often doesn't fully rebound. Plan on lifelong therapy.

The Bottom Line

TRT works. If you have genuinely low testosterone and lifestyle intervention hasn't fixed it, TRT is safe, effective, and increasingly accessible.

Start NHS if you have time (free, safe, monitored)
Choose private if you want faster access and more control
Get bloodwork before and throughout; dosing by symptoms alone is guesswork
Expect 3-6 months to optimise; don't judge results after 4 weeks
Monitor for side effects; good clinicians adjust, not abandon

Get the free TRT decision framework — should you consider TRT? This checklist walks you through the decision tree.

[Download the framework →]