How to Increase Testosterone Naturally: What Really Works

Hardly any hormone carries as many myths as testosterone. The internet is full of boosters, tricks and promises – while more and more men complain of fatigue, declining performance and low drive. The good news: the most important levers for healthy testosterone levels are well researched, cost nothing and improve almost everything else along the way.

This guide separates what works from what only costs money. It is the pillar article of our Men's Health topic.

What testosterone does in the body

Testosterone is the most important male sex hormone, but it also occurs in women in smaller amounts. In men, over 95 percent is produced in the testes, controlled by the brain (hypothalamus and pituitary gland). Among other things, it affects:

• Muscle mass and strength – it promotes protein synthesis in muscle.
• Bone density – a deficiency raises the long-term risk of osteoporosis.
• Fat distribution – low levels often go hand in hand with more belly fat.
• Libido and sexual function.
• Drive, mood and energy.
• Blood formation – testosterone stimulates the production of red blood cells.

Levels fluctuate over the day: highest in the morning, up to 20–30 percent lower in the evening. That is why they are measured in the morning for a diagnosis.

Lever 1: sleep

Most of the daily testosterone is released during sleep, especially in the early morning hours. If you sleep too little, you cut off exactly this phase.

In a much-cited study from the University of Chicago, young, healthy men slept only five hours a night for one week. Their daytime testosterone dropped by 10 to 15 percent – an effect equivalent to about ten to fifteen years of ageing. Sleep apnoea, i.e. pauses in breathing at night, is also closely linked to low testosterone.

What helps:

• Seven to nine hours of sleep with fixed times, even at weekends.
• A dark, cool bedroom, no screens in the last hour.
• With loud snoring, breathing pauses or severe daytime sleepiness: have sleep apnoea checked by a doctor.

Specific strategies are in Sleep as a performance booster. If you work shifts, help is in Shift work and sleep.

Lever 2: body fat

Excess weight is one of the strongest opponents of healthy testosterone. Fat tissue contains the enzyme aromatase, which converts testosterone into oestrogen. At the same time, visceral belly fat disrupts hormonal control in the brain. The result is a vicious circle: less testosterone, more belly fat, even less testosterone.

The good news: the circle can be turned the other way. Studies show that men with excess weight raise their testosterone significantly by losing weight – the more weight lost, the bigger the increase.

What helps: a moderate calorie deficit with plenty of protein and strength training, so you lose fat rather than muscle. How that works is explained in Lose fat, keep muscle. Belly fat specifically is covered in Losing belly fat.

Lever 3: strength training and movement

Strength training triggers a brief rise in testosterone after a session, especially with big exercises such as squats and deadlifts. However, this effect is small and gone after about an hour. According to current knowledge, it is not decisive for muscle growth.

The real benefit lies elsewhere: regular training lowers body fat, improves insulin sensitivity, promotes good sleep and preserves muscle mass – all of which supports a healthy hormone balance. A sensible plan with three sessions a week is enough, such as the 3-day full-body plan.

Too much of a good thing: very high training volumes with little recovery and too little energy can lower levels. Endurance athletes with very high volumes in particular more often have low values. Signs of overload are described in Recognising overtraining.

Lever 4: nutrition

There is no single "testosterone food". What matters is the overall picture:

• Enough energy. A permanent energy deficit lowers testosterone.
• Enough fat. Very low-fat diets were associated with slightly lower levels in studies. 25–35 percent of calories from fat is a good range, focusing on olive oil, nuts, fish and eggs.
• Enough protein to preserve muscle, see How much protein do you need?.
• Plenty of vegetables, fruit and fibre – for weight control and metabolism.

Lever 5: alcohol

Alcohol directly inhibits testosterone production in the testes and also worsens sleep. Occasional moderate amounts are not a big problem for a healthy man; regular heavy drinking lowers levels significantly. How alcohol disrupts sleep in particular is explained in Alcohol and sleep.

Lever 6: stress

Chronic stress keeps cortisol levels high. Cortisol and testosterone work against each other in many processes. Stress can't be switched off, but it can be handled better: through exercise, sleep, breaks and breathing techniques. Whether your body is permanently in stress mode often shows in a low heart rate variability – more in Understanding HRV.

Supplements: what helps and what doesn't

The honest summary: no over-the-counter product replaces sleep, weight loss and training. Whether you have a vitamin D or zinc deficiency is shown by a blood test. Which values make sense for athletes is covered in Blood values for athletes.

Five myths fact-checked

"Soy lowers testosterone." The concern comes from animal studies and isolated cases with extremely high amounts. Reviews in men found no relevant effect on testosterone from normal consumption of soy products.

"Cold showers boost testosterone." There is no solid evidence for this. Cold can feel refreshing and lift your mood – but it is not a hormone booster.

"Eggs and red meat are testosterone foods." No single food measurably raises levels. What matters is enough energy, fat and micronutrients across your whole diet.

"More training means more testosterone." Moderate strength training supports healthy levels; very high volumes without sufficient recovery and energy can lower them.

"Low testosterone is normal and unavoidable after 40." The age-related decline is slow. Clearly low levels are often linked to excess weight, lack of sleep, illness or medication – and can therefore be influenced.

Medications and conditions that play a role

Lifestyle is not always the cause. Certain factors lower testosterone independently of it:

• Medications: including opioids, long-term glucocorticoids (cortisone) and some psychiatric drugs. Never stop medication on your own – talk to your doctor.
• Past anabolic steroid misuse: it can suppress the body's own production for a long time.
• Conditions: type 2 diabetes, sleep apnoea, liver disease, pituitary disorders or thyroid dysfunction.
• Acute illness and rapid weight loss: lower levels temporarily – a reason not to measure during such phases.

Typical signs of low levels

Testosterone deficiency often develops gradually. Typical symptoms are:

• clearly declining libido, erectile problems
• persistent fatigue and lack of drive
• loss of muscle mass and strength despite training
• an increase in belly fat
• low mood, irritability, problems concentrating
• hot flushes, less beard growth (less common)

These symptoms are non-specific and can also come from lack of sleep, thyroid problems, depression, medication or stress. That is exactly why they need a medical check.

Getting testosterone measured properly

If you want to know your level, have it measured properly:

1. In the morning between 7 and 11 am, when levels are highest.
2. Fasted, and not after a sleepless night or acute illness.
3. Total testosterone, supplemented with SHBG and free testosterone if needed.
4. Repeat an abnormal result – a single low value is not enough for a diagnosis.

0 nmol/l30 nmol/l

1. Clearly low · 0–8 nmol/lunder approx. 8 nmol/l (2.3 ng/ml) – see a doctor
2. Grey zone · 8–12 nmol/lapprox. 8–12 nmol/l – symptoms and repeat tests decide
3. Usually unremarkable · 12–30 nmol/lover approx. 12 nmol/l (3.5 ng/ml)

Testosterone replacement therapy: a brief note

With a confirmed deficiency and symptoms, a medically prescribed testosterone therapy can make sense. It is not a lifestyle measure: it suppresses the body's own production, can severely limit fertility and requires regular checks of blood count, prostate and other values. Anyone who wants children must discuss this with their doctor beforehand. Taking testosterone without a medical indication is a health risk.

Your 8-week roadmap

Conclusion: not a trick, but a system

You don't reach healthy testosterone levels with a capsule, but with the basics that decide health in general: sleep, body fat, training, nutrition, little alcohol and handling stress well. That sounds less spectacular than a booster – but it demonstrably works. And if you have symptoms, get measured instead of guessing. How to design training and recovery sensibly after 40 is covered in Muscle building after 40; how training protects your heart in Heart health and training.