Men's Hormone Health
The Man's Guide To
Testosterone — Signs,
Science & What To Do
Low energy. Poor sleep. Losing muscle. Low mood. These aren't just signs of getting older — they could be your testosterone talking. Here's everything you need to know.
The Big Picture
Testosterone Is Declining — And It's Not Just An Age Thing
Here's something that should get more attention: testosterone levels aren't just declining as individual men age — they're declining across entire generations. A study tracking testosterone in men aged 15 to 40 found a nearly 25% drop in average levels over just 17 years. Men today have lower testosterone than their fathers did at the same age.
That's not just an ageing problem. That's an environmental and lifestyle problem — and it means symptoms of low testosterone are showing up earlier than ever before, in men who are far too young to just chalk it up to getting older.
From around age 40, testosterone declines by roughly 1% per year. But the frustrating truth is that many men experience symptoms well before that — and most don't connect the dots until things have been off for a long time. A UK study found that 86% of men with testosterone deficiency delayed seeking help for at least a year, and nearly a quarter lived with symptoms for over five years before getting a diagnosis.
Testosterone deficiency remains largely underdiagnosed because its symptoms are easily mistaken for stress, depression, or simply "getting older."
What Testosterone Actually Does
It's Not Just About Libido. It's About Everything.
Most men think of testosterone as the "sex drive hormone." And yes, it plays a major role there. But testosterone is involved in far more than that — it's essentially a master regulator for how you feel, function, and perform every single day.
The Signs
Symptoms Most Men Dismiss As "Just Getting Older"
The problem with low testosterone is that its symptoms are vague, gradual, and easy to rationalise away. Here are the most common signs — and the ones most often missed:
High-priority symptoms
Common but often missed
How many symptoms are needed to suspect testosterone deficiency?
Research shows the more symptoms you have, the more likely low testosterone is the cause. Even 2–3 consistent symptoms warrants a blood test.
Based on British Society for Sexual Medicine guidelines on testosterone deficiency
Know Your Numbers
What Does a Healthy Testosterone Level Actually Look Like?
The NHS reference range for total testosterone in men is 8.6–29 nmol/L — a wide range that means many men with genuine symptoms still get told they're "normal." The median UK level is 17 nmol/L, but optimal function is generally associated with levels above 18–20 nmol/L.
Testosterone levels — what the numbers actually mean
NHS lower limit: 8.6 nmol/L. UK median: 17 nmol/L. Functional optimal: 18–25 nmol/L. Source: Forth 2025 UK analysis of 20,000+ blood tests.
This is why private blood testing matters. A man at 10 nmol/L is technically "in range" by NHS standards — but is almost certainly experiencing symptoms. Knowing your exact number gives you something to work with, rather than being told you're fine and sent away.
A full testosterone panel should include total testosterone, free testosterone, SHBG (sex hormone binding globulin), LH, FSH, and ideally cortisol and oestradiol. Together, these give a complete hormonal picture — not just a single number.
What Kills Testosterone
The Lifestyle Factors Quietly Tanking Your Levels
Lifestyle factors and their impact on testosterone levels
The cortisol-testosterone relationship is particularly important. Cortisol and testosterone work in opposition — when one goes up, the other tends to go down. Chronic stress, overtraining, poor sleep, and a high-pressure lifestyle all keep cortisol elevated, which directly suppresses testosterone production.
Men with obesity also have, on average, 23% lower testosterone than men with a healthy BMI — and losing weight is one of the most effective interventions for naturally raising testosterone levels.
What You Can Do
How to Support Healthy Testosterone Levels — Naturally
Before considering medical intervention, there's a lot you can do through lifestyle that has a real, evidence-backed impact on testosterone levels. These aren't hacks — they're the foundations.
Get your levels tested
You can't manage what you don't measure. A private blood test gives you your baseline — and the ability to track whether the changes you make are actually working. Aim for a morning fasting test, ideally after a rest day.
Prioritise sleep above everything
Most of your daily testosterone is produced during deep sleep. Consistently getting 7–9 hours of quality sleep is one of the single biggest levers you have. WHOOP users can track their deep sleep and HRV to see the direct impact on recovery and hormonal health.
Lift heavy, consistently
Resistance training — particularly compound lifts like squats, deadlifts, and bench press — is one of the most effective natural testosterone boosters. Aim for 3–4 sessions per week with progressive overload.
Manage stress and cortisol
Chronic stress suppresses testosterone. Building habits that manage cortisol — whether that's breathwork, proper recovery between training sessions, or simply protecting your downtime — pays hormonal dividends.
Optimise your key nutrients
Zinc, vitamin D, and magnesium are all directly involved in testosterone production — and all three are commonly deficient in UK men. Supplementing based on your blood results (not guessing) is the smartest approach.
Reduce alcohol and processed food
Alcohol directly suppresses testosterone — even moderate regular drinking has a measurable impact. Ultra-processed, high-sugar diets drive insulin resistance, obesity, and hormonal disruption. Cleaning up your diet is one of the fastest ways to move the needle.
85% of men who got treatment for testosterone deficiency said it was effective or very effective — and reported improvements in quality of life, mood, confidence, and performance.
When to Go Further
TRT — What It Is, When It's Relevant, and What to Know
If lifestyle changes don't move the needle — or if your levels are genuinely low — testosterone replacement therapy (TRT) is a medically established option. Research involving UK men who pursued TRT found that 85% rated it as effective or very effective, with meaningful improvements in quality of life, work performance, mood, and confidence.
TRT isn't for everyone, and it's not a decision to make without proper testing and medical guidance. But for men with clinically or functionally low testosterone, it's a legitimate and increasingly accessible option — through both the NHS (though criteria are strict) and private clinics across the UK.
The most important first step is always the same: know your numbers. A blood test is the only way to know whether your symptoms are driven by low testosterone, or by something else entirely.
Start With Your Numbers
Don't guess. A private blood test is the fastest, clearest way to understand where your testosterone actually sits — and what to do about it. At Boost & Glow, we can help you find the right path.
Explore Boost & Glow → Track Recovery With WHOOP →This blog is for informational purposes only and does not constitute medical advice. If you are experiencing symptoms of low testosterone, please consult a qualified healthcare professional before making any changes to your health routine or pursuing treatment.
0 comments