GN Vitamin D3 5000I.E.

Vitamin D is essential for strong muscles, a healthy immune function and unbreakable bones. Plus: Low levels of vitamin D have been linked to reduced testosterone levels. Luckily, taking Genetic Nutrition’s 5,000 IU vitamin D depot capsules only once a week will address all of these aspects of optimal health.


Product Description

Product highlights:

  • promotes muscle function
  • boosts immune function
  • provides the key nutrient to optimize calcium uptake and its incorporation into your bones and teeth
  • delivers what it takes to keep your bones healthy and strong
  • facilitates optimal testosterone production
  • contains a unique depot formula that has to be used only once a week
  • prevents the development of vitamin D deficiency, which is prevalent in Western societies (e.g. in Germany ~60% of the adult population is deficient)
  • can help if you feel burned-out, have a general lack of energy or motivation or suffer from depression or seasonal affective disorder (SAD)
  • can reduce your risk of cancer and heart disease
  • can reduce your osteoporosis risk
  • one bottle of GN Vitamin D 5,000 IU will last for up to 60 weeks!

Vitamin D is not just a vitamin; it is one of the key hormone for optimal health. It is involved in a myriad of highly important physiological processes and serves dozens of different functions in your body. Having low or even suboptimal levels of vitamin D can thus have a plethora of far reaching negative effects on your well-being, health and athletic performance. If you feel burned out, lack drive and are susceptible to infections, you show all the classic signs of low vitamin D levels or a full-blown vitamin D deficiency.
Now, having low levels of vitamin D is not just especially prevalent among fitness enthusiasts from the northern hemisphere, it is also especially problematic for both, bodybuilders and athletes, in general, because it may directly affect their physical performance and testosterone production!
In Germany and other Western countries ~60% of the adult population suffers from vitamin D deficiency. Even more people show symptoms due to low, but not yet deficient vitamin D levels. It should be obvious that this is an issue you cannot leave unaddressed –after all, even levels of vitamin D that are not technically classified as “deficiency state” can have significantly ergolytic (=performance reducing) effects.
While many of us manage to get roughly 10% of their daily vitamin D requirements from foods. Most of the vitamin D in our body is produced in our skin in response to sun exposure. It is thus hardly surprising that people who are living in the northern or utmost southern part of the hemisphere are having a particularly hard time covering their D-requirements. With the lack of sun exposure during the respective winter seasons, they simply don’t get enough sunlight to satisfy their daily needs.
You don’t care, because testosterone and muscle strength are not among your top priorities of you? Well, I guess you will be intrigued to hear, then, that the provision of sufficient amounts of vitamin D has also been linked to 15% reduced risks of cancer and heart disease – with the mortality from the latter being reduced by more than 80%, this alone should be reason enough to make sure you are not “D-ficient”!
We know that what you’ve read so far sounds like bad news. The good news, however, is: it is hilariously cheap and easy to get all the vitamin D you need. Since vitamin D can be stored in your body, all you have to do is to take a single cap of GN Vitamin D3 5000IU per week (not per day!) to optimally cover your vitamin D requirements. This means that a single bottle of GN Vitamin D3 5000IU will last up to 60! (yes, that’s sixty!) weeks.
So, if you’re running low and vitamin D – and chances are you are running low even during the summer time (remember: 60% of the people in the industrialized world are deficient), there’s no cheaper and easier way to replete your vitamin D levels in order to increase your testosterone levels, improve your physical and cognitive performance, to ramp up your well-being and optimize your immune function,… ah, and did we mention that this will also reduce your risk of cancer and dying from a heart attack?
How is GN Vitamin D3 5,000IU different from all other, conventional vitamin D products?
The most significant difference between GN Vitamin D3 5,000 IU and the cheap vitamin D product you may be using is the fact that taking only one serving per week will effectively cover 100% of your vitamin D requirements. This is nothing like the cheap products from the drugstore or pharmacy you may know. And that’s not just because it is more convenient, but also because taking GN Vitamin D3 5,000 IU once a week – with one of your possibly few high fat meals (this assumes that you’re following a low fat diet and are thus at particular risk of vitamin D deficiency) – will facilitate the optimal absorption of this precious fat-soluble vitamin.
What exactly is vitamin D?
In contrast to what the name implies, vitamin D is actually more than an essential vitamin that is relevant for a plethora of physiological functions of your body. It is also, or rather primarily, a steroid hormone. And as if that was not yet complicated enough, there are two forms of vitamin D you will find in your foods: vitamin D2 and D3… although, strictly speaking, both are only prohormones to the active form of vitamin D, calcitriol, your body will convert them to.
Plus: Eventually, we must also take into account that humans have evolved not to have to rely solely on food, when it comes to this important steroid hormone. Whenever we are exposed to the UVB radiation from the sun, our skin will start producing it from the universal hormone precursor, cholesterol.
So, you can “eat it” and produce it yourself? So where’s the problem, then: Well, the problems here are that (a) our diets are low in vitamin D and that we (b) don’t get enough sun exposure to produce sufficient amounts of vitamin D. Accordingly, we end up with suboptimal if not deficient levels of this essential vitamin and steroid hormone in our bodies during both, winter times, when there’s simply not enough sun for our skin to produce sufficient amounts of vitamin D and during the summer, when we cover our skin with clothes and sunblockers to protect us from the carcinogenic side effects of sun exposure.
What exactly does vitamin D do in our bodies?
Vitamin D is, as previously highlighted, of vital importance to various physiological processes of which we can only address the most significant in the following paragraphs.
The probably best known function of vitamin D relates to tooth and bone health. Without vitamin D your teeth and bone would become brittle, because it is an essential prerequisite of proper bone formation and inhibits the effects of parathyroid hormones which are constantly threatening your bone by promoting bone resorption. Since vitamin D will also increase the uptake of calcium from the digestive tract and regular your calcium and phosphate metabolism, it is also the molecule to guarantee you have the necessary raw material to build and maintain strong bones and teeth. It is thus hardly surprising that the link between low levels of vitamin D and an increased risk of fractures and reduced tooth health was one of the first side effects of vitamin D deficiencies scientists discovered.
In contrast to what scientists have long thought, vitamin D’s importance is, however, by no means restricted to bones and teeth. Rather than that, research over the last 25 years indicates that it is at least as, if not more important for the maintenance, accrual and function of muscle mass – with the latter offering a previously overlooked link to fractures in the elderly, in whom vitamin D is essential for the ability of muscles to work together and thus fall and ultimately fracture prevention.
To all men, but especially bodybuilders, taking GN Vitamin D3 5000IU offers another important advantage, as it will prevent the deterioration of their testosterone production that has been found to be an inevitable consequence of reduced vitamin D levels. Now, this does not mean that vitamin D is a testosterone booster, but it is certainly essential for the maintenance of normal levels of the manliest among all hormones.
In view of the fact that vitamin D is also required for optimal immune health, brain development and insulin production; and considering the fact that it has been found to help maintain normal blood pressure levels, it is out of question that even suboptimal levels of vitamin D cannot must not remain unaddressed.
What are the health benefits you can expect from supplementing with GN Vitamin D3 5,000 IU?
Eventually, all the many health benefits you of GN Vitamin D3 5,000IU can be traced back to the suboptimal vitamin D supply in our diets / the lack of sun regular exposure in our society. By taking GN Vitamin D3 5,000 IU you can make sure that your body has all the vitamin D it needs to function optimally. You would be stupid, however, if you stopped reading now, because you are taking a multi-vitamin, already. After all, many of the >60% of the citizens in the Western hemisphere will do the same and are still suffering from full-blown vitamin D deficiency or, at least, suboptimal vitamin D levels. Especially during the winter months, it is almost impossible to cover your vitamin D requirements without taking supplemental vitamin D.
If you feel tired, lack drive or are, even worse, depressed, it is very well possible that you’re vitamin D deficient. Multiple studies have linked low levels of vitamin D to people’s overall energy levels, their ability to concentrate, and their physical and cognitive performance. Even a reduced sleep quality has been found to correlate with low levels of vitamin D. It is thus not that surprising that studies have found that the mere repletion of low vitamin D levels can, in some cases, cure, in any case reduce the severity of depression, which has been found to be inversely correlated to people’s vitamin D levels (=the less vitamin D, the more severe their depressions).
Even your susceptibility to infections could, eventually, be a result of suboptimal vitamin D levels. A very intriguing randomized controlled trial, for example, revealed that as little as 800 IU of vitamin D per day can reduce your risk of infection by 60%. Subjects taking 2000 IU showed even 90% reduced rates of infection. The same pattern as with depression: the lower your vitamin D levels, the higher the risk / severity of infections / depression.
If you are suffering from osteoporosis, vitamin D can help by promoting the deposition of calcium in your bones and thus increasing their stability.
Comparatively few people know that vitamin D serves a similar purpose as it does in bones, in muscle where a lack of vitamin D has been found to reduce the strength and resilience, too. In this context, it should also be mentioned that vitamin D also plays an important role in testosterone production. With low levels of vitamin D being linked to a reduced production of this anabolic sex hormone, it is thus of particular importance for athletes, especially bodybuilders, to maintain normal, or better optimal levels of vitamin D to maintain and promote muscle mass and performance.
What we must not forget, either, is that reduced levels of vitamin D have been linked to increased risks of at least 15 forms of cancer – among those, all the highly prevalent forms such as prostate-, breast- and bowel cancel, where the proliferation of abnormal cells can be significantly reduced if there’re sufficient amount of vitamin D around. Similar evidence exists for other forms of cancer, which is why it is only logical that a recent meta-analysis of scientific studies found a 15% overall risk reduction for all forms of cancer (taken together). Practically speaking, this means that something as simple as taking GN Vitamin D3 5,000IU to maintain optimal levels of vitamin D could have saved 34000 of the 230000 people who died from cancer in German, alone, in 2014.
With its cardio-protective effects, stable vitamin D levels in the optimal range have furthermore been shown to reduce the mortality after myocardial infarctions by 81% in a recent Danish study.
What are possible reasons for the high prevalence (~60%) of vitamin D deficiency in Europe and other industrialized countries?
As previously pointed out, vitamin D is produced in our skin in sufficient amounts only we expose large parts to the UVB radiation from the sun. That’s a problem for several reasons. While it may still be technically possible from March to October, because there’s enough UVB radiation in the summer sun, it is simply impossible during the winter time, when, due the angle at which the sunlight passes through our atmosphere the UVB content of the already little rare sunlight is significantly reduced. With office work, clothes and sunblockers (SPF 10 reduces the vitamin D production by 90% anything with SPF >15 blocks it completely) during the summer and a mere lack of UVB radiation during the winter time, Westerners who can actually cover their vitamin D requirements merely from dietary sources and the vitamin D that is produced in their skin are the exceptions to a rule that leaves more than 60% of us vitamin D deficient or, at least, with suboptimal levels.
Now, theoretically, we are “designed” to thrive off our fully-stocked vitamin D levels from the summer during the winter times. With us being hardly able to cover our contemporary requirements during the summer time, the vast majority of us will yet be unable to build up the reserves we’d need during the short periods of sufficient sun exposure.
In addition, there are certain parts of the population who are at particular risk of developing a vitamin D deficiency even if they get enough sun. Among those people are the elderly, in whom the age-related reduction in our skins ability to synthesize vitamin D makes it virtually impossible to produce enough D and dark-skinned people in whom the pigments in their skin act as a natural sunscreen that reduces the production of vitamin D.
Now, we’ve previously pointed out that there are also sources of vitamin D in our diet. Unfortunately, the actual amount of the vital vitamin is so low, even in high vitamin D foods, that you’d have to consume exorbitant amounts of them to cover your needs – 1.3kg champignons, for example, or 15 eggs, 2kg of hard cheese, 1-2kg of fish or 7kg of beef liver. It is thus not surprising that the amount of vitamin D in the average Westerner’s diet will cover at best 10-20% of his or her daily requirements.
Against that background it is not surprising that the German Robert-Koch Institute, just like similar institutions in other Western countries, estimate that approximately 60% of the Germans suffer from severely low vitamin D levels.
What are the consequences of having low levels of vitamin D?
In view of the myriad of functions vitamin D fulfills in your body, it is not surprising that the symptoms of vitamin D deficiency are complex. Initial signs that you may not be getting enough vitamin D are tiredness, a lack of drive and ability to concentrate, as well as an increased susceptibility to infectious diseases such as the common cold or influenza – in fact, declining vitamin D levels have been implicated as one of the reasons for the increased prevalence of influenza infections from March to October.
Depression and a general lack of drive have also been linked to low vitamin D levels; with the former being all-the-more severe the lower your levels are. Some scientists even go so far to speculate that the “winter blues” (seasonal depression disorder) could be nothing but a lack of vitamin D.
For athletes in general and bodybuilders in particular, the effects of vitamin D on their physical performance and natural testosterone production are of particular importance. This is all the more true, because low levels of vitamin D have been linked to both, low levels of total and low levels of active, free testosterone – the prerequisite of optimal muscle function and growth.
A lack of vitamin D can yet produce much more severe health problems than “just” low testosterone levels. In fact, one of the first vitamin D deficiency diseases scientists discovered are rickets, a disease you will usually see in children (in adults a similar pattern is referred to as osteomalcia). It is caused by vitamin D deficiency and characterized by imperfect calcification, softening, and distortion of the bones typically resulting in bow legs.
Much more prevalent than this extreme form of bone disease is the subtle, progressive loss of bone mass that will occur even with low, not technically deficient vitamin D levels many of us know as osteoporosis. As it progresses this disease leads to a demineralization of your bones that will eventually make them so fragile that they break under as little pressure as the weight of your own body.
If we also take into account that the sufficient provision of vitamin D reduces both, the risk of dying from a myocardial infarction and your chances of developing cancer, it should be obvious that your money could hardly be better spent than on a weekly serving of GN Vitamin D3 5.000IU.
Who is particularly likely to develop a vitamin D deficiency?
While everybody in the northern hemisphere is at an increased risk of developing a vitamin D deficiency due to the lack of UVB radiation, especially in the winter months, there are parts of the population whose risk is particularly high:
Homebodies, office workers and bedridden people: All of them spend too little time outside and will thus not be able to get the amount of sun exposure that is necessary to cover their vitamin D requirements.
Older people: As we age, our ability to synthesize vitamin D in the skin is constantly declining. A 70-year old, for example will produce up to 75% less vitamin D in response to a given amount of UVB radiation than a 20-year-old.
People who wear sunscreen / clothes whenever they’re in the sun: Even if sunscreen and UV-blocking clothes may make sense from a skin cancer perspective, they will also block the natural production of vitamin D in your skin. Even sunscreen with an SPF of only 10 will reduce your cutaneous vitamin D production by 90%. Anything with an SPF of >15 will block it completely.
People with a darker skin color: The dark skin pigment has a similar effect as sunscreen. It protects the skin from the UV radiation and will thus reduce the production of vitamin D significantly. For people with darker skin colors who live in the northern hemisphere it is thus of particular importance to use vitamin D supplements to avoid developing low or deficient vitamin D levels.
Pregnant women and women undergoing menopause: Pregnancy will significantly increase a woman’s vitamin D requirement. Going through menopause, on the other hand, has been shown to increase a woman’s risk of vitamin D deficiency due to interactions between vitamin D and the hormonal changes during the menopausal transition.
Vegetarians and Vegans: With meat and fish being among the best food sources of vitamin D, the average vegetarian will consume ~50% less vitamin D than his or her meat-eating fellow man.
Overweight and obese individuals: Even if vitamin D is stored primarily in our fat tissue, having more body fat will not necessarily improve your vitamin D supply. On the contrary: research shows that the release of stored vitamin D from the fat into the bloodstream is significantly impaired in overweight and obese individuals. Even in people who are only 10% above their ideal weight, the vitamin D level has been found to be 4% lower than average. Put simply: the fatter you are, the higher the risk that you may be or may become vitamin D deficient.
People who take prescription meds, especially corticosteroids like prednisone: While there are several drugs that can negatively affect your vitamin D levels, corticosteroids which are often used to treat sports injuries are particularly notorious for their ill effect on your body’s vitamin D stores.
Are people who are suffering from kidney stones allowed to use GN Vitamin D3 5,000IU?
If you have or have had kidney stones, you should discuss supplementing vitamin D with your doctor. He will be able to calculate the ideal dosage for you based on blood tests.
Do you have to take GN Vitamin D3 5,000IU with food?
Since vitamin D3 is a fat-soluble vitamin, taking it with a meal that contains at least small amounts of fat is recommended, because the fat can promote the absorption.
Can you overdose on vitamin D3?
While overdosing on vitamin D is generally possible, it has been observed only rarely and as a consequence of taking ten or more times the recommended daily amount of vitamin D over the course of several months. We still highly recommend, you stick to the suggested dosage for GN Vitamin D3 5,000IU and don’t make the mistake to think that “more helps more.


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