Tackle low testosterone

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Feel like yourself again. Check your testosterone and start a personalised plan designed by expert TRT doctors.

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TESTOSTERONE TESTING

Get your diagnosis

We recommend our nurse-led venous blood test, as this is the gold-standard method for accurately diagnosing testosterone deficiency and includes a doctor consultation with free confirmatory testing if your levels are low. If you’re not ready for a full diagnostic pathway, our at-home capillary test offers a convenient initial indication of your testosterone levels.

What is low testosterone?

Testosterone is the hormone that plays a role in muscle strength, energy, mood, bone density, and sexual health. Clinically low testosterone is diagnosed when blood levels fall below the healthy range on repeated testing, alongside symptoms.

When levels drop, it can affect body composition, confidence, motivation, and long-term health. Symptoms matter because they signal when your body isn’t functioning as it should, and deserve proper medical attention.

SYMPTOMS

The signs of low testosterone

If these symptoms are holding you back, Numan can help.1 If you’ve already been diagnosed with low testosterone, book a call with one of our patient support managers.

Erectile dysfunction

Decreased libido

Fatigue

Poor sleep

Mood changes

Difficulty concentrating

Loss of muscle mass

Increased body fat

Reduced hair growth

Causes

Causes of low testosterone

Low testosterone rarely has a single cause. For many men, it’s the result of overlapping factors:2

Age-related decline

  • Testosterone levels gradually decline with age.

  • Brain-to-testes hormone signalling becomes less efficient over time.

  • Testes may start to 'fail' as men grow older.

  • Changes in sleep, activity and body composition can accelerate the drop.

Medical conditions

  • Excess body fat can disrupt the hormone signals needed for testosterone production.

  • Type 2 diabetes is closely linked to lower testosterone and impaired hormone balance.

  • Pituitary or hypothalamus disorders can reduce the signals that stimulate testosterone production.

  • Some medications may reduce T levels.

Lifestyle factors

  • Chronic stress can lower testosterone by disrupting hormone balance.

  • Testosterone is produced during deep sleep, so poor sleep directly reduces levels.

  • Excess alcohol, smoking, and recreational drug use can impair testosterone production.

  • Poor diet can limit the nutrients needed for hormone production.

  • Low physical activity reduces the body’s natural testosterone stimulation.

SHINING THE SPOTLIGHT

Symptoms of low testosterone creep in gradually, but because they build slowly, they’re often swept under the carpet, leaving many men undiagnosed and unsupported.

At Numan, we don’t overlook it. We investigate properly, with thorough testing, doctor-led consultations, and a clear pathway to a full range of effective treatment options.

25%

of men under 40 may experience signs of low testosterone, rising to roughly 40% in those over 45.3

33%

of erectile dysfunction cases may be linked to low testosterone.4

90%

of men with low testosterone go undiagnosed or misdiagnosed with conditions like depression.5

Digital clinic

Benefits of the Numan TRT Programme

Here’s what to expect from our three-part online TRT programme.

Clinician-led treatment

Tailored treatment plans, designed by our clinicians to support your health journey.

Ongoing clinical care

Clinicians will help you manage potential side effects, make dosage adjustments, provide follow-up blood tests, and answer any questions you might have throughout the programme.

Doorstep delivery

Regardless of your treatment, your package will be delivered in a discreet box, right to your doorstep.

numan patient

Real people. Real impact.

Hear from people who’ve experienced the life-changing impact of testosterone treatment, and how the right support helped them feel their best again.

Results

What results to expect when you start TRT

Clinical studies have observed that as testosterone levels increase, some men report gradual improvements in areas such as energy, mood and sexual wellbeing over time. Changes don’t happen overnight, and everyone responds differently, but treatment is designed to support steady, clinically-monitored progress.6

Month 1-3

  • Higher libido

  • Stronger erections

  • Improved mood and energy

Month 3-6

  • Higher strength and endurance

  • Fat loss

  • Motivation and mental clarity

Month 6 onwards

  • Faster recovery

  • Ongoing reduction in visceral fat

  • Bone strength

Already diagnosed with low testosterone?

If you’re currently on TRT or have had a recent low testosterone blood test, simply book a free call. Our Patient Support Managers will help guide you towards your next steps.

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

*Low testosterone levels must be confirmed on the initial VBT to get a free doctor consultation. Normal results do not warrant further clinical intervention.

  1. Morales A, Bebb RA, Manjoo P, Assimakopoulos P, Axler J, Collier C, et al. Diagnosis and management of testosterone deficiency syndrome in men: clinical practice guideline. CMAJ [Internet]. 2015;187(18):1369–77.

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

  3. Andre B. Araujo, Gretchen R. Esche, et al. Prevalence of Symptomatic Androgen Deficiency in Men, The Journal of Clinical Endocrinology & Metabolism, Volume 92, Issue 11, 1 November 2007, Pages 4241–4247

  4. Rabijewski M, Papierska L, Kozakowski J, Zgliczyński W. The high prevalence of testosterone deficiency in population of Polish men over 65 years with erectile dysfunctions. Aging Male. 2012;15(4):258–62.

  5. Layton JB, Li D, Meier CR, Sharpless JL, Stürmer T, Jick SS, et al. Testosterone lab testing and initiation in the United Kingdom and the United States, 2000 to 2011. J Clin Endocrinol Metab . 2014;99(3):835–42

  6. Morley J. The benefits and risks of testosterone replacement therapy: a review. Ther Clin Risk Manag. 2009;427.

  7. Kumagai H, Zempo-Miyaki A, Yoshikawa T, Tsujimoto T, Tanaka K, Maeda S. Lifestyle modification increases serum testosterone level and decrease central blood pressure in overweight and obese men. Endocr J. 2015;62(5):423–30.

Reclaim Your Vitality

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

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