Testosterone: The Ultimate Guide for Men

The male sex hormone, testosterone, has a major impact on male health and performance. We've gathered everything you need to know about testosterone right here!

Jul 29, 2024by Miriam Johansen
A group of masculine men, in mud and roaring with strength

What is Testosterone?

Testosterone is commonly known as the male sex hormone, but it is present in both men and women. In men, it is produced in the testicles, while in women, it is produced in the ovaries, but in much smaller amounts.

Often linked to sex drive, testosterone also plays a crucial role in sperm production. Numerous studies indicate that it influences bone density and muscle mass, as well as fat distribution in men. Additionally, a man's testosterone levels can impact his mood.

This hormone is also vital for the production of red blood cells, which transport oxygen to all parts of the body.

What Does Testosterone Do for Men?

Testosterone is the most important sex hormone in men. It is essential for:

  • Developing the penis
  • Deepening the voice during puberty
  • Beard growth
  • Muscle growth
  • Bone growth
  • Sex drive (libido)

As men age, testosterone levels decrease. In fact, a 20-year-old man produces on average 60% more than a 50-year-old man!

Overview of the average testosterone level based on age. The table shows that testosterone levels start to decrease in the 30s
How fast and how much testosterone you lose varies from man to man. But on average, men's testosterone levels start to decline from the age of 35. This decline continues for the rest of his life.

Why Does Testosterone Deficiency Happen?

Many men experience a decline in energy and vitality as they age. After the age of 40, the natural production of male sex hormones typically decreases significantly, which can present some challenges.

Testosterone deficiency is a common issue, especially as men get older. This topic has received a lot of media attention, highlighting the importance of understanding that testosterone deficiency often becomes more prevalent with age.

READ MORE: 5 Causes of Low Testosteron – and What You Can Do!

Where in the Body is Testosterone Produced?

Testosterone is primarily produced in the testes, though a certain amount is also produced in the adrenal cortex. Production takes place in the Leydig cells.

Leydig cells are hormone-producing cells in the testicles. Luteinising hormone (LH) stimulates the production and secretion of testosterone from these cells.

Testosterone is responsible for inhibiting the production of LH. In other words, once testosterone is produced, LH will not be produced.

Damage to the testicles can lead to reduced production of the hormone.

How Does Testosterone Work?

This male sex hormone plays a key role in the development of the genitals during puberty. Luteinising hormone (LH) is inhibited by testosterone at an early age, but when puberty begins, the interaction between these two and several other hormones becomes significant. It is therefore very important to maintain this balance throughout life in order to feel healthy.

On the surface of prostate cells, we find something called androgen receptors. These receive signals from testosterone.

Androgen receptors are crucial for developing a deeper voice, increased muscle mass, beard growth, pubic hair, and the development of the penis, prostate, and seminal vesicles. In adult men, they are also important for maintaining sexual desire and sexual ability.

READ MORE: 11 Symptoms of Low Testosterone

How High Should Testosterone Levels be?

A man of around 35 years old produces between 200 and 1200 nanograms of testosterone per decilitre.

However, this is very individual and will vary based on several different factors such as diet and stress. For example, production will increase after exercise as the body compensates for the loss of energy.

If your production is low, such as 50-80% of optimal testosterone production, it may be smart to make an effort to increase the level. You can do this by exercising or changing your diet.

You can have your levels tested by your doctor. You can also get an indication of your testosterone levels in our online test.

Take the testosterone test here.

When Does Testosterone Levels Drop?

Testosterone levels vary between individuals, but many experience their highest levels in their 20s. This remains fairly stable until around the age of 35, when, for many, the level slowly starts to decline.

Besides age, other factors such as exercise, diet, and testicular injuries also affect your testosterone levels.

Many men experience a kind of midlife crisis in their 50s, which can lead to a decrease in vitality and energy levels. To prevent such a crisis, it’s a good idea to exercise and switch to a diet rich in zinc, magnesium, and other nutrients that boost testosterone production.

How Do You Increase Testosterone Levels?

First and foremost, it's important to exercise and ensure you eat a healthy and varied diet. Your diet should contain the necessary amounts of zinc, magnesium, and vitamin B6. Zinc is good for maintaining normal testosterone levels in the blood and supports normal reproductive function and fertility. Vitamin B6 helps reduce fatigue. Magnesium supports normal muscle function.

READ MORE: 6 Natural Ways to Increase Testosterone

Which Foods Can Help Boost Testosterone?

You should try to eat a varied diet consisting of good amounts of zinc, magnesium and vitamin B. Examples of such foods are:

  • Dark chocolate
  • Salad
  • Spinach
  • Walnuts
  • Almonds
  • Avocado
  • Banana
  • Brown rice
  • Potatoes

All of these foods can help boost testosterone production. The right supplements can also help increase testosterone levels in the body.

READ MORE: What Foods to Eat To Boost Testosterone

Is Testosterone Legal?

There are various supplements on the market that are designed to increase testosterone production. These are often referred to as "testosterone boosters". Some of these are classified as drugs and some are also listed on the doping list, such as dehydroepiandrosterone (DHEA).

It is perfectly legal to consume supplements that can boost testosterone production as long as the product only contains ingredients that are not classified as drugs or on the doping list.

Who can Get Testosterone Therapy?

If you start noticing symptoms of low testosterone levels, it’s advisable to see a doctor. You can undergo testing and possibly receive testosterone therapy on prescription.

READ MORE: What is Testosterone Replacement Therapy - and What Are the Alternatives

Men with prostate cancer should avoid taking testosterone supplements.

There are also self-assessment tests available. For instance, an online questionnaire can provide an initial indication of whether you might have low testosterone levels. Follow up with a blood test at your GP to confirm the diagnosis.

If you are diagnosed with low levels, your doctor may refer you to a urologist.

Do You Want Normal Testosterone Levels?

This article is written by the team behind 4HIM TestoBalance, one of the Nordic region's most popular supplements for men.

Daily intake of 4HIM TestoBalance provides the body with zinc, which helps maintain normal testosterone levels in the blood, as well as magnesium and vitamin B6, which help reduce fatigue and exhaustion. Magnesium contributes to normal energy metabolism, normal muscle function and normal psychological function. Mucuna pruriens can help boost sex drive and improve fertility.

Want to try it too? Join thousands of other men across the Nordics and order here.