treat low testosterone

Testosterone Replacement Therapy

Boost your strength, lift your mood, and reignite your libido by increasing your testosterone levels. Check your eligibility for a tailored treatment plan from our expert doctors.

man stroking beard

Clinically-proven treatments

One-to-one support from TRT doctors

Fast, discreet delivery

What is TRT?

Testosterone replacement therapy is a treatment that helps raise low testosterone levels in men. It’s typically used when testosterone drops below a healthy range and starts to affect everyday life: things like energy, mood, sex drive, muscle strength, and motivation.¹

TRT works by supplementing your body with testosterone to bring levels back to where they should be. When used properly and monitored by a healthcare professional, using TRT to increase your testosterone levels can help improve your overall wellbeing and make healthy habits easier to maintain.¹

Step by step

How to join the TRT programme

STEP ONE

Test your levels

Our venous blood test accurately measures your total and free testosterone levels, along with 40+ additional markers to get a complete picture of your health.

TRT Blood Test

STEP TWO

Talk to a doctor

If your results show low or borderline low testosterone, and you’re experiencing symptoms, one of our Numan doctors will review your case to determine whether TRT is right for you.

Doctor consultation

STEP THREE

Start treatment

If you’re eligible, you’ll be prescribed the treatment that suits your lifestyle, and you'll begin regular monitoring to ensure safe, effective treatment.

KYZATREX

Who is eligible for TRT?

Not every man with low testosterone levels will need treatment, but if your levels are low and you’re experiencing symptoms, TRT could be an option. To be considered eligible for TRT, you must meet our criteria which follows the guidance of the British Society for Sexual Medicine (BSSM):2

Level (nmol/L)ZoneAction
>12NormalTRT is usually not recommended unless symptoms are severe.
8-12LowTRT may be appropriate if symptoms are present.
<8Very lowTestosterone deficiency is likely. If you’re experiencing symptoms, TRT may be advised.

Results

What results to expect when you start TRT

From improved energy and mood in the early weeks to better sexual function and body composition over the following months, here’s what you can expect as your treatment takes effect and your testosterone levels increase.3

Month 1-3

  • Higher libido

  • Stronger erections

  • Improved mood and energy

  • Improvement in inflammation markers

  • Early fat loss and muscle gain

Month 3-6

  • Higher strength and endurance

  • Improved cardiovascular health

  • Reduced risk of type of 2 diabetes

  • Further fat loss

Month 6 onwards

  • Higher bone density

  • Improved cognition

  • Faster recovery

  • Ongoing reduction in visceral fat

TRT Diagnosis Package

Start your TRT treatment journey

Start your testosterone treatment with a gold-standard venous blood test to ensure a fast and accurate diagnosis. Our expert TRT doctors will then review your results and recommend the best treatment plan.

Effective testosterone treatment
Why Numan TRT?

We provide holistic treatment programmes that incorporate medication, supplementation, lifestyle advice, clinical support, and ongoing testing.

All testosterone treatment programmes include:

  • Effective medication

  • 24/7 access to our expert clinical team

  • Regular monitoring with blood tests

  • Symptom tracking

  • Personal patient support manager

  • Lifestyle advice

SYMPTOMS

Know the signs of low testosterone

If these symptoms are holding you back, Numan can help:10

Erectile dysfunction

Decreased libido

Fatigue

Poor sleep

Mood changes

Difficulty concentrating

Loss of muscle mass

Increased body fat

Reduced facial and body hair growth

numan patient

Real people. Real impact.

As everyone is unique, we offer a range of ways to get you back to your best, from lifestyle changes and symptom relief to testosterone replacement therapy. 

UK DOCTORS AND CLINICIANS

Your expert team
Specialists in medicine, nutrition, performance, and diagnostics.

FAQS

Your questions answered

Knowledge

Testosterone: what you need to know

References

  1. Araujo AB, Esche GR, Kupelian V, O’Donnell AB, Travison TG, Williams RE, et al. Prevalence of symptomatic androgen deficiency in men. The journal of clinical endocrinology and metabolism. 2007;92(11): 4241–4247.

  2. Hackett G, Kirby M, Rees RW, Jones TH, Muneer A, Livingston M, et al. The British society for sexual medicine guidelines on male adult testosterone deficiency, with statements for practice. The world journal of men’s health. 2023;41(3): 508–537.

  3. Barbonetti A, D’Andrea S, Francavilla S. Testosterone replacement therapy. Andrology. 2020;8(6): 1551–1566.

  4. Celec P, Ostatníková D, Hodosy J. On the effects of testosterone on brain behavioral functions. Frontiers in neuroscience. 2015;9: 12.

  5. Shigehara K, Izumi K, Kadono Y, Mizokami A. Testosterone and bone health in men: A narrative review. Journal of clinical medicine. 2021;10(3): 530.

  6. Grossmann M, Gianatti EJ, Zajac JD. Testosterone and type 2 diabetes. Current opinion in endocrinology, diabetes, and obesity. 2010;17(3): 247–256.

  7. Kaur H, Werstuck GH. The effect of testosterone on cardiovascular disease and cardiovascular risk factors in men: A review of clinical and preclinical data. CJC open.

  8. Testosterone replacement in men with obesity: a systematic review and meta-analysis. European journal of endocrinology. 2021;186(1): 123–135.

  9. El-Osta A, Liu VN, Huang D, Foster J, Johnson H, Alaa A, et al. A cross-sectional survey of experiences and outcomes of using testosterone replacement therapy in UK men. Translational andrology and urology. 2025;14(5): 1295–1307

  10. Sizar O, Leslie SW, Schwartz J. Male hypogonadism. In: StatPearls. Treasure Island (FL): StatPearls Publishing; 2025.

Check your testosterone

Experiencing decreased libido, fatigue, or increased body fat? You might have low testosterone. Check if low-T is affecting you today.

Test your Testosterone
Testosterone Replacement Therapy (TRT) | UK Online Test