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Vitamin D3 5000IE - GN Laboratories

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Vitamin D3 5000IE - GN Laboratories

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11,83 €

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Product Highlights:

  • Promotes a normal functioning of your muscles
  • Promotes a proper immune function
  • Is essential for the absorption of calcium
  • Promotes healthy and strong bones
  • Promotes a healthy production of muscle building hormones
  • Due to the depot form only one capsule per week is necessary
  • Prevents a vitamin D deficiency, which afflicts almost 60% of the population
  • Can relieve fatigue, tiredness and even depression
  • Can reduce your cancer and heart attack risk
  • Can protect against osteoporosis
  • One package last for 60 weeks!

Why do you need a vitamin D supplement?

Vitamin D is a key hormone for your health that is needed in your body for thousands of important processes and functions. A vitamin D deficiency can have many serious negative effects on your health and athletic performance, and even a less than optimal vitamin D intake can affect your performance and your well-being. If you often feel exhausted and powerless or are prone to colds and other infections, these may be the first signs of vitamin D deficiency. Particularly problematic for bodybuilders and athletes is the fact that a vitamin D deficiency can impair and lower the body's own production of muscle building hormones and this can affect your muscle strength and your muscle coordination! If you combine this with the fact that scientific recent research has shown that nearly 60% of all people suffer from a serious vitamin D deficiency, we probably caught your attention. And these 60% are only people with a serious deficiency. Not included are those whose vitamin D levels are in the lower normal, but not in the optimal range. These people can also benefit noticeably from a vitamin D supplementation, as many of the beneficial effects of vitamin D increase in direct proportion with the vitamin D levels in your body.

These numbers are not surprising, since especially in winter, when our body produces virtually no vitamin D due to less exposure to sunlight, our food can only cover 10 to 20% of our vitamin D requirement. For the non-athletes among you, who are not so concerned about muscle building hormones and muscle power, should be noted that getting enough vitamin D can reduce the general cancer risk by 15% and the risk of death from a heart attack by more than 80%.

The above sounds like pretty bad news. But now to the good news: a sufficient supply of vitamin D is dirt cheap and easy. Since vitamin D can be well stored in your body, one capsule of GN Laboratories Vitamin D3 5,000 per week is enough to meet your vitamin D needs. And one bottle of GN Laboratories Vitamin D3 5,000 will last for 60 weeks - more than a year. If you lack vitamin D - and the probability is at least 60% - there is probably no more cost-effective way to significantly increase levels of muscle building hormones in men, improve your performance and well-being, and improve your immune function - not to mention a reduced risk of dying of cancer or heart attack.

What sets GN Laboratories Vitamin D3 5,000 apart from all other available Vitamin D products?

The biggest and most important advantage of GN Laboratories Vitamin D3 5.000 that sets this product apart from the competition is the depot form we use, which allows you to meet your vitamin D requirement with just one capsule per week. Till now, you had to swallow one capsule or tablet every day to achieve this. This is not only much more comfortable, but can also improve the vitamin D absorption by your body - especially for people who eat a low-fat diet. Since vitamin D is a fat-soluble vitamin, it is necessary to take it after a meal that is rich in fat for an optimal absorption by your body. If you use regular vitamin D products this means eating a meal rich in fat every day, while with GN Laboratories Vitamin D3 5,000, you only need one high-fat meal per week.

What exactly is vitamin D?

Vitamin D is an essential vitamin that is needed by your body for many important processes. Strictly speaking, vitamin D is not a vitamin but a steroid hormone. To make things even more complicated, the vitamin D2 and D3 versions contained in food and supplements are strictly speaking only a prohormones, which are converted to their active form in your body. Another peculiarity of vitamin D is that it is the only vitamin that your body. Another peculiarity of vitamin D is that it is the only vitamin that your body can produce itself. With sufficient sun exposure your body can produce vitamin D from cholesterol with the help of UVB rays. This however only works to a sufficient extent if the UVB radiation of the sun is strong enough and your skin is exposed to this radiation long enough. This is not the case in autumn and winter months in many countries, as the sun is too low and most of your skin is covered with clothing. Since our diet typically contains only very small amounts of vitamin D, a vitamin D deficiency is widespread - especially during the winter months.

Vitamin D can be stored in your body in certain amounts in your liver and in your fat cells to serve as a depot during periods of insufficient vitamin D production by your body and an inadequate vitamin D intake with your diet.

Which functions does vitamin D have in your body?

Vitamin D is involved in many, sometimes vital processes, and we can only give you an overview of the most important functions at this point.

The functions for which vitamin D is essential in your body include, among other things, health and stability of bones and teeth. Vitamin D is required for the conversion of bone stem cells into bone cells. At the same time, vitamin D inhibits the formation of the parathyroid hormone, which promotes bone degradation. In addition, vitamin D regulates the calcium uptake in your intestine, as well as the calcium and phosphate balance and metabolism of your body. As vitamin D also promotes the incorporation of calcium into your bones, it contributes to strengthening your bones and a lower susceptibility for bone fractures.

But vitamin D is not only important for regulating your calcium balance and maintaining strong bones. It is also responsible for maintaining the function of your muscles. Not only does it help to build muscle mass, it also improves your muscle coordination and can help to reduce the risk of falls in older people.

Particularly interesting for all men and especially bodybuilders is the fact that without sufficient amounts of vitamin D, the body's natural testosterone production decreases. Studies have shown that natural levels of muscle building hormones in healthy men were significantly increased by a vitamin D supplementation. This does not necessarily mean that vitamin D is a Hormone booster, but it certainly works as a hormone booster in men who are deficient in vitamin D or have lower than optimal levels of vitamin D. In these cases vitamin D can restore the reduced endogenous production of muscle building hormones to normal values.

In addition, vitamin D can strengthen your immune system and is also important for brain development and function, insulin production, and blood pressure regulation. As you can see, vitamin D has many important functions in your body. Conversely, this unfortunately also means that all these functions will significantly be impaired by a vitamin D deficiency. We will discuss the exact consequences of vitamin D deficiency in more detail below.

Which health benefits can a supplementation with GN Laboratories Vitamin D3 5,000 have?

Basically, most of the health benefits of supplementing with GN Laboratories Vitamin D3 5,000 are based on a compensation of an existing vitamin D deficiency and ensuring that your body is well supplied with vitamin D. But please do not stop reading at this point. Fact is that according to research almost 60% of all people in Europe suffer from a serious vitamin D deficiency. This does not yet include people who have vitamin D levels that are in the lower normal range, but below the optimal range. Without a vitamin D supplementation, it is almost impossible to maintain healthy vitamin D levels - especially during cold seasons.

If you suffer from fatigue, lack of energy and maybe even depressive moods, this can very well be the result of a vitamin D deficiency. Numerous studies have shown that a vitamin D supplementation can improve your energy levels, your concentration, your performance, your mood and also your sleep quality. In addition, a vitamin D supplementation can relieve depression in certain cases. Scientific studies have shown that the lower the levels of vitamin D in your body are, the more severe a depressive mood associated with a vitamin D deficiency is.

Even if you often suffer from infectious diseases such as colds, a vitamin D supplementation could help you. An interesting study found out that a daily dose of 800 IU of vitamin D reduced the risk of infection in people suffering from a vitamin D deficiency by 60%. At 2000 IU, the risk of infection was even reduced by 90%! Do not forget: the lower the vitamin D levels in the body, the higher the risk of infection.

If you suffer from osteoporosis, vitamin D may help you as it promotes the incorporation of calcium into your bones and thus increases the stability of your bones. It is less well-known that a vitamin D supplementation can also improve your muscle’s strength and stability, as a vitamin D deficiency will cause just the opposite. Particularly interesting for athletes and bodybuilders is the already mentioned fact that studies have shown that vitamin D supplementation can increase the body's own production of muscle building hormones in healthy men. More muscle building hormones means more strength, more muscle and an increased athletic performance. Only very few people know that a vitamin D supplementation can significantly reduce the risk of at least 15 different types of cancer, such as prostate, breast and colon cancers, because vitamin D can locally prevent the growth of cancer cells. Even with an existing cancer, vitamin D can inhibit tumour growth. A meta-analysis concluded that a vitamin D supplementation may reduce the average cancer risk by 15%. With 230,000 cancer related deaths in Germany in 2014, it would have been possible to save over 34,000 lives by a vitamin D supplementation.

A vitamin D supplementation can also help to protect your cardiovascular health. Danish scientists came to the conclusion that optimal vitamin D levels in the body can reduce the mortality rate due to heart attacks by 81%.

What are the reasons for a vitamin D deficiency and why do almost 60% of the population suffer from it?

As already mentioned, the body's own vitamin D production, which requires adequate sun exposure of the skin, is the most important source of vitamin D for our bodies. During the months from October to March, however, the solar radiation in our latitudes is too weak to sufficiently stimulate our body’s vitamin D production. This problem is made even worse by the fact that it is too cold during that time to show much skin, which this low UVB radiation could hit. Only during the months from April to September our body can produce sufficient amounts of vitamin D – if we get enough sun. Vitamin D that is produced above demand can be stored in your body to some extent, but the maximum daily vitamin D production is also limited.

As a result of our modern lifestyle most people can not spend enough time in the sun even in summer to stimulate an adequate vitamin D production. If you work in the office all day long, you will often only come outside in the morning and late in the afternoon. Unfortunately, at these times, the sun is so deep that the UVB radiation that will hit the skin is too weak to stimulate an optimal vitamin D production. To top all this, many people use more or less potent sunscreen products when they expose themselves to the sun. This sunscreen reduces the amount of UVB radiation that hits the skin - often to that extent that any vitamin D production will be almost completely prevented. Even a sun protection factor of 10 will reduce your body’s vitamin D production by 90% and a sun protection factor of 15 will prevent your body’s vitamin D production almost completely. In theory, it would be possible to survive winter without a vitamin D deficit only with the vitamin D stored during summer, but the prerequisite for this is that the maximum possible amount of vitamin D is produced on most days during summer. This is not the case for the vast majority of people because the above mentioned reasons and the longer winter lasts, the sooner these depots will be used up. In addition, there are groups of the population that have an increased risk of a vitamin D deficiency even when exposed to sufficient sunlight. These include older people, as the body's own vitamin D production decreases sharply with increasing age. This is supported by studies showing that nearly 80% of the elderly suffer from a vitamin D deficiency. And people with a darker skin colour will produce less vitamin D, because the dark pigments of their skin act as a natural sunscreen. Vitamin D is also found in small amounts in certain foods. But since these amounts are quite low, it is almost impossible to meet your vitamin D needs by food. To do this you would have to eat 1.3 kilos of mushrooms, 15 eggs, 2 kilos of hard cheese, 1 to 2 kilos of fish or more than 7 kilos of liver per day. On average, our normal diet covers just 10 to 20% of our daily requirement of vitamin D. Considering this, it is not surprising that a study conducted by the Robert Koch Institute came to the conclusion that nearly 60% of all Germans are seriously deficient in vitamin D. The results of this study are consistent with the results of other studies in Europe and America.

What are the consequences of a vitamin D deficiency?

Due to the many important body processes in which vitamin D is involved, the consequences of a vitamin D deficiency are very diverse. The first symptoms often include fatigue, a lack of drive, a reduced performance and an increased susceptibility to infectious diseases such as cold and flu. It is no coincidence that the flu often rages most in February and March. At this time, most people's vitamin D reserves are already exhausted and therefore their immune system is weakened. Depressive moods can also be a sign of a vitamin D deficiency, and the lower the levels of vitamin D in your body, the more severe these symptoms become. A lack of vitamin D is also blamed to be one of the reasons for a so-called winter depression.

For athletes and bodybuilders, a reduced physical performance because of a vitamin D deficiency is particularly critical. This problem is further exacerbated by the fact that an insufficient vitamin D supply can lower the body's own production of muscle building hormones and thus the levels of free, active muscle building hormones. Not to mention that a vitamin D deficiency inhibits muscle growth and impairs muscle coordination.

However, a vitamin D deficiency can also cause significantly more serious health problems. These include rickets in children and the corresponding disease in adults, referred to as osteomalacia. The main feature of these diseases are soft, deformable bones, which often results in bowlegs and may also result in spinal deformity in children.

A more common and well-known health problem that is linked with a vitamin D deficiency is osteoporosis. In this disease, bone mineral density decreases because of bone demineralization which will dramatically increase the risk of fractures.

As an adequate vitamin D intake will reduce cancer risk and rate of death from heart attacks, it is clear that a vitamin D deficiency can significantly these risks.

But it does not have to come that far. Just one capsule of GN Laboratories Vitamin D3 5,000 per week is enough to fully cover your body's needs for Vitamin D and to protect you from all these unwanted and dangerous consequences of a vitamin D deficiency.

Who is particularly at risk of vitamin D deficiency?

In essence, all people who live in northern and middle latitudes of our earth where the sun shines not strong enough for many months in a row to allow a sufficient natural vitamin D production are at risk. However, there are some people who have an even higher risk of a vitamin D deficiency: "Couch potatoes", people with office jobs and bedridden people: All these people spend most of their time indoors and therefore often do not get enough sun to ensure a sufficient vitamin D production even in summer.

Older people: As you grow older, your body's ability to produce vitamin D will continuously decline and may be as much as 75% lower in a 70-year-old person than in a 20-year-old. People who only expose themselves to the sun with sunscreen: Even if a sunscreen is recommended for skin cancer prevention, this sunscreen will also inhibit your body's own vitamin D production. A sun protection factor of 10 will reduce your body’s vitamin D production by 90% and starting with a sun protection factor of 15 your body's own vitamin D production will come to a complete standstill. People with dark skin: The dark skin pigment melanin acts as a natural sunscreen, resulting in a reduced vitamin D production. For this reason, dark-skinned people in northern and middle latitudes should supplement with vitamin D even in summer to prevent a deficiency. Pregnant women and menopausal women: During pregnancy, the vitamin D requirement may increase significantly and during menopause, there is often a vitamin D deficiency due to the hormonal changes.

Vegetarians: Because vitamin D is found in highest concentrations in meat and fish, vegetarians consume on average 50% less vitamin D than "carnivores" through their diet. Obese: Even though vitamin D is primarily stored in adipose tissue in the body, it is often no longer released into the blood in overweight people. Even with 10% overweight, the vitamin D levels may drop by more than 4% and with a higher weight the vitamin D levels will decrease even more. People who are treated with corticosteroids like cortisone: Corticosteroids, which are commonly used to treat sports injuries, drain the body's vitamin D3 stores and this can lead to a vitamin D deficiency.


Can people suffering from kidney stones use GN Laboratories Vitamin D3 5,000?

If you suffer from kidney stones, you should consult with your doctor before taking any vitamin D supplementation. Based on your vitamin D blood levels, he will calculate how much vitamin D you can add via supplements.

Should you take GN Laboratories Vitamin D3 5,000 with food?

Since vitamin D3 is a fat-soluble vitamin, it should be taken after a meal that contains some fat otherwise it may not be absorbed well by your body.

Is an overdose of vitamin D possible?

A vitamin D overdose is possible and undesirable because of its potential negative health effects. An overdose, however, will only occur when more than ten times the recommended amount of vitamin D is taken daily for several months. For this reason it is advised not to exceed the recommended dosage of GN Laboratories Vitamin D3 5.000.

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We use only the purest ingredients of the highest possible quality that the market has to offer. In order to guarantee you a consistent, high quality of all our products, each of our products is regularly tested for purity and quality of all of its ingredients.


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take more than 1 capsule every 7 days with water


Vitamin D (Colecalciferol, Ergocalciferol)

Vitamin D bzw. Calciferole ist ein Sammelbegriff für verschiedene Stoffe (Steroide), die im eigentlichen Sinn den Hormonen zuzuschreiben sind. Sie können vom menschlichen Organismus aus Cholesterin in der Haut durch Sonneneinstrahlung gebildet werden. Das in der Haut durch Sonneneinstrahlung gebildete Vitamin aus Cholesterin ist das Vitamin D3 oder auch Cholecalciferol. Das aus Pflanzen stammende Provitamin D, Ergosterin wird ebenfalls durch Photolyse in der Haut umgewandelt. Es trägt die Bezeichnung Ergocalciferol bzw. Vitamin D2. Cholecalciferol und Ergocalciferol besitzen die gleiche Wirksamkeit.
Das Vorkommen in Lebensmitteln ist insgesamt sehr niedrig. In den meisten pflanzlichen Lebensmitteln befindet sich kein vorgefertigtes Vitamin D. Eine Ausnahme bilden Pilze, Spinat, einige Kohlarten und Hefe. Dort ist Ergocalciferol in verhältnismäßig großen Mengen vorhanden. In Lebensmitteln tierischen Ursprungs, sind nur in fettreichen Fischen (Lachs, Forelle, Thunfisch, Hering, usw.) größere Mengen an Cholecalciferol zu finden. Vitamin D ist relativ hitzestabil, wodurch bei der Zubereitung (Blanchieren oder Braten) von Vitamin-D-haltigen Lebensmittel kaum mit Garverlusten dieses Vitamins zu rechnen ist. Gegenüber Sauerstoff und Licht ist es sehr instabil. Lange Lagerzeiten, besonders im Hellen setzen die Bioverfügbarkeit des Vitamins herab.


Vitamin D wird vorallem in der Leber gespeichert. Dort und zum Teil auch in der Niere und im Darm wird Vitamin D3 weiter zu einem Stoff (D-Hormon bzw. Calcitriol) umgewandelt. Dieser Stoff ist für die Regelung des Calciumstoffwechsels verantwortlich.


Vitamin D ist Bestandteil des endokrinen Systems und dort für die Regulierung des Calcium- und Phosphatstoffwechsels verantwortlich. Vitamin D steuert die Calciumresorption (Aufnahme) aus dem Darm, bei einem Absinken des Blutcalciumspiegels.

In vielen Geweben, wie Geschlechtsdrüsen, Herz, Pankreas (Bauchspeicheldrüse) und Schilddrüse sitzen Rezeptoren für Calcitriol (D-Hormon; ein Vitamin-D-Metabolid). Doch welche Aufgaben das Hormon dort besitzt, oder wie es diese Gewebe beeinflusst, ist noch weitgehend unbekannt.


Vitamin D bildet sich durch UV-Strahlung (Sonnenlicht!) aus Vorstufen (z.B. 7-Dehydrocholesterol, Ergosterol), den sogenannten Provitaminen. Nur wenige Nahrungsmittel enthalten Vitamin D. Es findet sich in Lebertran und -öl, Hering und Eigelb. Besonders reiche Vitamin D-Quellen (μg/100g)

  • Sardine 7,05
  • Hering 31
  • Lachs 16
  • Kabeljau 1,3
  • Leber (Geflügel) 1,3
  • Leber (Rind) 1,7
  • Kalbfleisch 3,8
  • Lebertran 330
  • Dorschleberöl 210 10. Ei 3,5

In Pflanzen ist Ergosterol enthalten, während in tierischen Geweben 7-Dehydrocholesterol vorkommt. Beide Verbindungen können sich bei ausreichender UV-Licht Bestrahlung in biologisch aktive Substanzen umwandeln, die wir unter dem Begriff Vitamin D zusammenfassen. Mangelsymptome
Bei einem Vitamin-D-Mangel wird die Aufnahmefähigkeit von Calcium herabgesetzt. Dies wiederum senkt die Calciumkonzentration in Blut. Dieser Calciummangel wirkt sich bei Kindern und Jugendlichen ungünstig auf den Knochenbau aus. Die Knochen werden nur unzureichend mit dem stabilisierendem Mineral versorgt, was zu Verformungen des Skeletts (Beine und Wirbelsäule) und zu einer geringeren Belastbarkeit der Knochen führt. Das entspricht dem Krankheitsbild Rachitis. Der niedrige Blutcalciumspiegel kann zusätzlich noch zu Krämpfen und zu Veränderungen der Nervenbelastbarkeit führen. Bei Erwachsenen kann Vitamin-D-Mangel zu einer Entkalkung des Skeletts und zu Störungen der Muskelnerven führen. Die Entkalkung des Skeletts äußert sich durch Knochenverformung und spontane Knochenbrüche. Häufig kommt es zu Osteoporose bis hin zu Knochenschwund.


Wie Vitamin A hat auch Vitamin D sehr gute Speichereigenschaften und wird nur in verhältnismäßig kleinen Mengen ausgeschieden. Dies führt bei einer Überdosierung von Vitamin D schnell zu Schädigungen des Organismus. Symptome von Hypervitaminose D sind:

  • Übelkeit
  • Erbrechen
  • Durst
  • Muskelschwäche
  • übermäßige Calciumausscheidung über den Harn
  • erhöhte Harnmenge


Der Vitamin-D-Bedarf bzw. die Zufuhrempfehlungen gestalten sich nicht so einfach, wie bei anderen Vitaminen. Grundsätzlich bildet der Körper bei ausreichender Sonneneinstrahlung genügend Vitamin D, um sich selbst zu versorgen. Zugleich schwankt der Bedarf dieses Vitamins durch viele Faktoren. Gesundheit, Alter, sowie der Calcium- und Phosphorgehalt der Nahrung spielen dabei eine entscheidende Rolle. Von der DEG (Deutschen Gesellschaft für Ernährung) wird für Erwachsene und Kindern nach dem zwölften Lebensmonat eine tägliche Zufuhr von 0,005mg mit der Nahrung empfohlen. Bei Kindern unter zwölf Monaten, werdenden Müttern und Stillenden ist der Vitamin-D-Bedarf leicht erhöht, darum wird eine zusätzliche Aufnahme von 0,01mg Vitamin D pro Tag empfohlen.

Bedarf im Sport

Corticosteroide, z.B. Cortison und Prednison, die im Sport nicht selten Behandlungen von Verletzungen eingesetzt werden, entleeren die körpereigenen Speocher des Vitamins D3. Eine Langzeitanwendung von Corticosteroiden kann so zum Abbau von Knochenmasse führen. Meine Empfehlung, 200-400I.E. am Tag mit einer Mahlzeit einnehmen.

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