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What Is Testosterone?

What Happens if Levels Are Too Low or Too High?

Low testosterone in men may cause fatigue, reduced muscle mass, low sex drive, erectile dysfunction, or mood changes.

High testosterone (naturally or from supplements) can sometimes lead to acne, mood changes, increased red blood cell counts, or other health concerns.

If you’re asking because of symptoms you’re experiencing, we can talk about what you’ve noticed and whether testing your levels would make sense.

What is Testosterone?

Testosterone is a hormone, which means it’s a chemical messenger in your body. Both men and women produce it, but men usually have much higher levels. In men, it’s made mostly in the testicles. In women, it’s made in smaller amounts in the ovaries and adrenal glands.

Here’s what testosterone does:

1. Development During Puberty

Testosterone is responsible for many of the changes that happen during male puberty, such as:

– Deepening of the voice
– Growth of facial and body hair
– Increase in muscle mass
– Growth of the penis and testicles
– Sperm production

In women, it also plays a role in puberty, especially in sexual development and libido, just at lower levels.

2. Muscle and Bone Health

Testosterone helps maintain:

– Muscle mass and strength
– Bone density (which helps prevent fractures)
– Healthy distribution of body fat
– Low levels can sometimes lead to decreased muscle strength or thinning bones over time.

3. Sex Drive and Sexual Function
Testosterone plays an important role in:

– Libido (sex drive)
– Erectile function in men
– Overall sexual satisfaction in both men and women
– Low testosterone can sometimes contribute to low libido or erectile difficulties.

4. Mood, Energy, and Cognitive Function

It also affects:

– Energy levels
– Motivation
– Mood stability
– Mental clarity

Some people with low testosterone report fatigue, low mood, or reduced motivation.

Symptoms of Low Testosterone

Low testosterone can affect many aspects of health and wellbeing. Common symptoms may include:

  • Ongoing fatigue or low energy
  • Reduced motivation or confidence
  • Low mood, anxiety or irritability
  • Reduced sex drive (libido)
  • Erectile difficulties
  • Loss of muscle mass or strength
  • Increased body fat, particularly around the abdomen
  • Poor concentration or “brain fog”
  • Disturbed sleep
  • Reduced physical performance or stamina
Not everyone experiences the same symptoms, and having symptoms does not always mean testosterone levels are low. This is why proper assessment and blood testing are essential.
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Benefits of TRT

Frequently Asked Questions (FAQs)

What is testosterone replacement therapy (TRT)?
TRT is a medical treatment used to restore testosterone levels in men with clinically confirmed testosterone deficiency. The aim is to relieve symptoms and improve overall health and wellbeing.
A diagnosis is based on both symptoms and blood test results. Having symptoms alone does not automatically mean testosterone is low. Blood tests are required to confirm levels before any treatment is considered.
Your initial appointment includes a discussion of your symptoms, medical history, and health goals, followed by on-site blood tests. Results are reviewed before any treatment decisions are made.
All treatment is prescribed and monitored by a qualified nurse independent prescriber within a CQC-registered clinic.
If treatment is started, you will attend monthly appointments, particularly during the early stages, to monitor response, adjust treatment if needed, and ensure safety.
When clinically indicated and properly monitored, TRT is considered safe for many men. Regular blood tests and follow-up appointments are essential to monitor effectiveness and reduce risks.
Yes. Ongoing blood monitoring is an important part of TRT to ensure testosterone levels remain within a safe range and to monitor other health markers.
This varies between individuals. Some men continue long-term treatment, while others may review or adjust therapy over time. Treatment is always kept under regular review.
Yes. All consultations, test results, and treatment are handled in a professional and confidential manner.
A GP referral is not required. However, with your consent, information can be shared with your GP if appropriate.
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Benefits of TRT

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Main Benefits of TRT:

  • More energy – You may feel less tired during the day.
  • Better mood – Can reduce irritability, low mood, or brain fog.
  • Stronger sex drive – Often improves libido.
  • Better erections – Helps some men with performance.
  • More muscle mass – Easier to build and maintain muscle.
  • Less body fat – May help reduce belly fat.
  • Stronger bones – Lowers risk of osteoporosis.
  • Better confidence & motivation – Many men feel more “like themselves.”
  • Can reduce Cardiovascular risk - may potentially improve certain cardiovascular health markers when monitored correctly and prescribed appropriately
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