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Backed by people who know performance
Low testosterone symptoms can take the joy out of life
Can affect:
Anxiety
Sex drive
Muscle mass
Lack of focus
Energy levels
Weight gain
Erectile dysfunction
Sleep quality
Do you experience these symptoms?
Testosterone replacement therapy, explained
What is TRT?
TRT is used to treat men with low testosterone levels, which can cause a range of life-debilitating symptoms. It works by supplementing the hormone, helping restore you to optimal body functions and overall well-being.
Could it be you?
The following symptoms could be a sign of low testosterone.
- Low sex drive
- Low energy
- Erectile dysfunction
- Lack of focus
- Depression
- Weight gain
- Low muscle mass
- Fatigue
Testosterone is the predominantly male sex hormone which is responsible for male development through puberty. It also has important roles throughout the body and affects physical, mental and behavioural factors.
There are a long list of benefits from using TRT including increased energy, mood, muscle mass, strength and cognition, as well as better sleep quality, more assertiveness and improved bone density.
Low testosterone is a combination of testosterone levels and symptoms. When men get symptoms it is very individual and related to genetic factors such as androgen receptor type and other biomarkers. Guidelines state that a healthy testosterone level sits somewhere between 15-30 nmol/L.
Undergoing testosterone replacement therapy is completely safe if you’re treated by a specialist doctor who regularly monitors your testosterone levels along with any side effects. At VOY we regularly monitor your blood results and symptoms to identify any rare issues you may be having so that we can manage them early.
As with all medications, some people may experience side effects - however, they’re easily controlled and generally avoided with sensible doses and regular monitoring. Some possible minor side effects include fluid retention, acne, and hair loss. More severe potential side effects include gynaecomastia (the growth of breast tissue), worsening of existing sleep apnea, increased cholesterol levels, decreased sperm count, and an increased number of red blood cells which may increase your risk of blood clots or a worsening of benign prostatic hyperplasia (enlarged prostate). However, these conditions are rare and can be mostly avoided or controlled through regular monitoring and other medications.
In order to keep side effects to a minimum you’ll check in to monitor your testosterone levels and any potential side effects. If you have any concerns or questions, get in touch with our clinicians - it’s free!
It is legal to purchase TRT online in the UK when buying through a private clinic such as VOY.
Are you experiencing low-T symptoms?
Answer 10 quick questions to assess if low testosterone could be holding you back.
How does it work?
TRT can be administered through various methods, including injections, tablets and creams. Your prescriber will identify which TRT medication may be appropriate for you.
Everyone's medical history is different, so your doctor will prescribe a medication that works for you. Testosterone replacement therapy involves taking prescribed testosterone medication in the form of injections, pills and creams.
Testosterone injections are the most common form of medication as they are convenient and most effective for the majority of men.
Our initial blood test will establish whether you have a testosterone deficiency. If the first test shows that you have low testosterone you’ll need to take our second, more comprehensive blood test if you’d like to start TRT - this is to confirm you do indeed have persistently low testosterone and to get a baseline measure of your core health before you start TRT.
If both tests show that you have low T levels, your prescriber will review your blood results and identify which TRT medication is appropriate for you.
The time taken to see results depends on your individual response and the medication you are taking. Most men start to see benefits within the first 6 weeks to 3 months. We will support you with regular blood testing to identify any changes that may be required to your treatment.
We usually recommend a minimum 3-6 month supply of TRT medication. At VOY, we offer medication options that maintain your testicular function and make it easier to stop if required.
Are you experiencing low-T symptoms?
Answer 10 quick questions to assess if low testosterone could be holding you back.
Why Voy TRT?
World-class treatment at your fingertips. Join the 12,000+ men who’ve transformed their lives with TRT.
Quick diagnosis & treatment
Doctors who specialise in TRT
Gold-standard treatment plans
Monitoring & treatment adjustment
90%
- Based on data on VOY clinical care data of over 2000 patients over the last 18 months
Are you experiencing low-T symptoms?
Answer 10 quick questions to assess if low testosterone could be holding you back.
The hormone that’s
holding men back
Testosterone levels have more than halved in the last 50 years.¹
Today's lifestyle is working against men. Testosterone deficiency is becoming more common, affecting energy, motivation, and overall vitality.
Only 1 in 20 are diagnosed.²
Too many men are suffering from the life-altering symptoms of this under-diagnosed condition.
- ¹Oral presentation, Session 61, 42nd Annual Meeting of the European Society of Human Reproduction and Embryology; 7 July 2026
- ² Liu, Vivian N et al. “Awareness and prevalence of the symptoms of testosterone deficiency: a cross-sectional survey of community-dwelling men in the UK.”BMJ openvol. 15,7 e094145. 10 Jul. 2025, doi:10.1136/bmjopen-2024-094145”
As seen in
Our testosterone treatments are transformative
Seeing results on a TRT service
Voy is transforming lives
"I have more life about me, I feel younger, I feel happier, I feel better — it’s now enabled me to focus on different spheres of my life"
"The whole journey has been life changing. I feel better within myself, and I know that people around me are starting to benefit from that — it’s been a big game changer."
"Since being on TRT my boss has seen such a difference in me — my energy levels are where they should be, and I’m back to being me, it’s fantastic"
How to start TRT treatment
At-home testosterone test
Start with a simple at-home finger-prick blood test which measures your total and free testosterone levels. You’ll get your results in 2 to 5 days.
Measures total testosterone & free testosterone
At-home finger-prick blood collection
Expert validated report
Enhanced testosterone test
A comprehensive venous blood test is needed to confirm the initial result, learn more about your health, and assess whether it’s safe to start treatment.
Venous collection by a nurse
Checks liver, kidney & PSA levels to make sure you’re suitable for treatment
Speak to a specialist Doctor
Your prescriber will review your blood test results and identify which TRT medication may be appropriate for you.
Video consultation
Private and confidential
Qualified TRT experts
Start your treatment
Your medication is dispensed by our GPhC-registered pharmacy and delivered to your home.
Monitoring testosterone & general health blood test
We’ll test your blood at 3 months, 6 months, and 12 months after to allow your doctor to effectively monitor your progress and make any adjustments.
Our pricing
Your medication options
Access gold-standard TRT medications delivered directly to your door.
Why choose Voy for TRT
Led by the country’s leading TRT experts
Dr Jeff Foster, MD
Director of Men's Health
Dr. Jeff Foster is the Director of Men’s Health at Voy, an NHS GP Partner, and a member of the British Society of Sexual Medicine Committee. With over 20 years of experience in medicine, he specialises in Men’s Health and testosterone management.
Dr Jeff Foster, MD
Director of Men's Health
Dr. Jeff Foster is the Director of Men’s Health at Voy, an NHS GP Partner, and a member of the British Society of Sexual Medicine Committee. With over 20 years of experience in medicine, he specialises in Men’s Health and testosterone management.
Dr Jeff Foster, MD
Director of Men's Health
Dr. Jeff Foster is the Director of Men’s Health at Voy, an NHS GP Partner, and a member of the British Society of Sexual Medicine Committee. With over 20 years of experience in medicine, he specialises in Men’s Health and testosterone management.
Your questions answered
Our team has a lifetime’s worth of expertise and experience between them. They’re on hand to answer all of your questions at every stage of your journey.
FAQ
Testosterone Replacement Therapy Plans: FAQs
Curated by Dr. Jeff Foster, Director of Men's Health
Articles
Learn more about testosterone
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