Written by Gatis Strods, Founder of TestoHit

TL;DR: Vitamin D is actually a hormone that directly affects testosterone production by stimulating Leydig cells in the testes. Science proves that vitamin D supplementation can increase testosterone levels by more than 25% in men with a deficiency.

Vitamin D and Testosterone: The "Sun Hormone" for Your Manhood

I'm Gatis Strods, and when I founded TestoHit here in Riga, I realized that one of the biggest enemies for men in Latvia is precisely the lack of sunlight. We often think of vitamin D only as something for bones or immunity, but in reality, it's one of the most potent hormonal regulators in the male body. Vitamin D and testosterone in men are directly related – the lower your vitamin D level, the less testosterone your testes can produce. In this article, I will explain why this "vitamin" (which is biologically a hormone) is crucial for your masculinity and what dose you should actually be taking.

Pilz et al. 2011: 25.2% Increase in Testosterone

Does vitamin D really help increase testosterone? The study conducted by Pilz et al. and published in the European Journal of Endocrinology in 2011 is one of the strongest pieces of evidence for this connection. Scientists conducted a double-blind experiment with men who had low vitamin D and testosterone levels. One group took vitamin D for a year, while the other took a placebo.

The results were clear: in men who took vitamin D, total testosterone levels increased from an average of 10.7 nmol/L to 13.4 nmol/L – a 25.2% increase. In the placebo group, there were no changes. This study clearly shows that addressing vitamin D deficiency is one of the most effective and cheapest ways to naturally support your hormonal balance. If your level is below 30 ng/ml, you are literally leaving testosterone on the table.

Why Leydig Cells Need Vitamin D?

How do vitamin D and testosterone interact in men at a biological level? Leydig cells, located in the testes and directly responsible for testosterone synthesis, contain vitamin D receptors (VDR). This means that vitamin D acts as a direct signal for these cells to "turn on" and start producing testosterone. Without sufficient vitamin D, this signal is weak or non-existent.

Vitamin D also helps reduce SHBG (sex hormone-binding globulin) levels, which means more testosterone remains in its "free" form and is available to your body. Furthermore, vitamin D protects testicular tissue from inflammation and oxidative stress, maintaining an optimal environment for hormone production. It is a fundamental "raw material" and regulator without which your male biology simply does not operate at full capacity.

The Latvian Phenomenon: Chronic Deficiency in Winter and Summer

In Latvia, we live in a zone where from October to April, the sun practically cannot provide vitamin D synthesis in our skin. Studies show that up to 80-90% of Latvian residents suffer from vitamin D deficiency during the winter months. But even in summer, many men work in offices and don't see the sun, so their levels don't rise out of the danger zone all year.

Low vitamin D levels in a man mean not only weaker immunity but also lower energy, worse mood, and, of course, lower testosterone. When I started working on TestoHit products in Riga, I realized that we needed a serious dose of vitamin D, not just a symbolic amount typically added to cheap multivitamins. In our northern latitudes, the requirements are completely different.

Dosage: Why 400 IU is "Just a Warm-up"?

Many doctors still recommend 400 or 800 IU (international units) of vitamin D daily, but modern science shows that such a dose is ridiculously small for a man who wants optimal testosterone. To maintain levels above 40-50 ng/ml (which is ideal for hormonal health), an adult man typically needs 2000 to 4000 IU per day.

In TestoHit MAXX capsules, we included 100 μg of vitamin D3 per serving, which corresponds to 4000 IU. I chose this dose because studies, including the aforementioned Pilz et al. study, used similar doses to achieve a real increase in testosterone. Small doses can help against rickets, but they won't do anything for your libido and muscle mass. If you want results, you need to take a dose with real biological significance.

Gatis Strods: Why I Insist on Vitamin D in All TestoHit Products

When I first had my blood tested for vitamin D, my level was 15 ng/ml. I felt like an exhausted old man, even though I was in my prime at the time. After I started taking 4000 IU daily, my level rose above 50 ng/ml, and my life completely changed – in the gym, at work, and in my general well-being.

It was this personal experience and scientific data that made me make vitamin D one of the main cornerstones of the TestoHit formula. I want men in Latvia to finally understand – low energy levels in winter are not "normal." It's a biological error that we can easily correct. Vitamin D and testosterone in men are the simplest and most effective way to regain your natural power.

Frequently Asked Questions

What is the ideal vitamin D level for a man?

Most experts agree that for a man's hormonal health, the level should be between 50 and 70 ng/ml. This ensures optimal Leydig cell function and testosterone synthesis.

Can you overdose on vitamin D?

Vitamin D is fat-soluble, so it can accumulate, but toxicity usually only occurs with very high doses (above 10,000 IU daily for months). A dose of 4000 IU is safe and effective for most men.

Is it better to use drops or capsules?

The form of vitamin D3 is more important than its physical state. The main thing is that it is taken with fats, as this is how it is best absorbed. In our capsules, vitamin D is balanced to be absorbed as efficiently as possible.

Why is vitamin D called a hormone?

Vitamin D is structurally similar to steroid hormones (such as testosterone and cortisol) and works by binding to specific receptors in cells to regulate gene expression.

Does sunbathing in a solarium help produce vitamin D?

Most solariums use UVA rays, which do not help vitamin D synthesis. Only UVB rays are what make your body produce this "vitamin," but they are available in natural sunlight only in summer.

How often should blood tests for vitamin D be done?

I recommend doing it twice a year – at the end of October (after summer) and at the end of March (after winter) to understand how your body is coping with seasonal changes.

To get all of this in one cup of coffee, SUPERCHARGED contains creatine, shilajit, trigonella, zinc, magnesium, and vitamins. The capsule variant - MAXX.