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Sunshine is more than just a pleasant passing phenomenon of ever-changing weather. It is a surprisingly vital aspect of health.
In fact, research suggests sun exposure can make you healthier, happier, and even live longer.
But for those living in higher latitudes (or those who spend a lot of time indoors), the short, cold days of winter leave you desperately sun-deprived.
It’s important to “winterize” your body against the lack of sun in order to stay in optimum health.
So how do you do this?
Vitamin D3 synthesis is catalyzed by ultraviolet radiation with a UV index above 3. The only places this happens year round are close to the equator between the 37th parallels
Anywhere above the 37 degrees from the equator receives insufficient UV radiation from October all the way to March!
For the United States, this means that anyone above the southern border of Utah, Colorado, Kansas, or Virginia is vitamin D deficient for almost half the year.
And the further north you go, the worse it gets.
So why does this matter?
Vitamin D is not actually a vitamin at all.
It is a hormone.
A vitamin is a necessary micronutrient that your body cannot synthesize and must be obtained through diet. While certain foods do contain this hormone, most of your vitamin D3 is made by your skin after exposure to sunlight.
UV-B light is absorbed by the skin, which induces something called “photolysis”, a multi-step process that transforms cholesterol stored in the skin cells into vitamin D3.
Once it is in circulation, like most hormones, it is involved in an shockingly wide array of biological processes.
It modulates the expression of at least 291 genes, and that's just what scientists have discovered so far. Some estimates are upwards of 2000. There are over 74,000 published, peer reviewed scientific articles on vitamin D3 and more are published every day.
The more we learn, the more we realize how important vitamin D (and regular exposure to sunlight) is to our health.
With so many processes affected by this hormone, it has countless health benefits, but the most important come down to 5 basic categories:
Immune Health Higher levels of vitamin D are correlated with lower incidences of all kinds of sickness, particularly upper respiratory infections like cold and flu [1,2]. Even more compelling, it is associated with lower risk of many forms of cancer, including colon, prostate, pancreatic, ovarian, and breast cancer [3-6].
Mood Vitamin D levels show a very significant relationship to symptoms of depression. This is reflected in the appropriately named S.A.D., seasonal affective disorder, where a person experiences transient symptoms of depression over the winter months. Vitamin D supplementation has been shown to reduce depressive symptoms in a number of clinical studies [7,8], but it is important to note that depression describes a symptom, not a specific cause. In many cases, vitamin D may have no effect on these symptoms.
Bone Health One of the most powerful effects of vitamin D, especially in older populations, is in regards to bone health. Osteoblasts, the cells that secrete the matrix of bone formation, have high levels of vitamin D receptors. These activate their bone-building behaviors and promote the mineralization of bone tissue . If we zoom out from the cellular level to what this actually means for real people, we find that higher levels of vitamin D levels are correlated with fewer bone fractures in all age groups [10,11] and vitamin D supplementation actually resulted in fewer falls among the elderly. There is also a potent synergistic interaction with vitamin K, another essential vitamin that improves bone health.
Cardiovascular Health In many studies, vitamin D supplementation was shown to decrease the risk of many kinds of cardiovascular disease , including heart disease and atherosclerosis as well as improving blood flow . Like bone health, it appears to have an interaction with vitamin K.
Athletic Performance One of the most unexpected benefits of vitamin D is in athletic performance. It is curious because the levels of vitamin D receptors in muscle tissue are relatively low. Despite this, studies in rats and in muscle tissue showed improved muscle recovery using vitamin D. 
Special Note For the Men As we discovered above, vitamin D is a cholesterol-derived hormone, converted from cholesterol stored in your skin cells. Most of your body's hormone systems are interrelated and affect each other. Progesterone, for example, lowers the synthesis of testosterone.
What's interesting about vitamin D, however, is that it actually promotes testosterone production in men, making it one of the easiest, most reliable means of boosting your own testosterone levels. 
The FDA's recommended dose of 400-800 IU per day is much, much too low for a normal adult.
How much you really need depends a lot on your own baseline levels. However, due to indoor lifestyles and the ubiquitous proliferation of UV-blocking sunscreen, it is estimated that 40% of the population is vitamin D deficient.
Most successful clinical studies of Vitamin D3 use doses between 1000 and 5000 IU. The upper safety limit for Vitamin D is estimated to be somewhere around 10,000 IU, so we recommend a dose of 5000 IU to ensure optimal levels of this important hormone.
In the summer months, the easiest and cheapest source is, of course, the sun. But in the depths of winter when we are largely indoors and covered head-to-toe, it is important to supplement in order to keep your body and mind in optimal health.
Vitamin D can also be found in certain food like eggs, fish, red meat, and dairy.
For most people, however, supplementation is highly recommended. Look for high-quality brands that you can trust with at least a 2000 IU of Vitamin D3. That is the minimum you need to meet your daily requirements.
If you're looking to simplify your supplementation regime, BodyHealth's Complete Multi + Liver Detox Support is packed with an unbelievable wealth of nutrition that would take at least 8 different bottles of pills to get the same spread of high-potency vitamins, minerals, and enzymes – including 5000 IU of Vitamin D.
Growth Hormone (GH or HGH) is one of the most important hormones in regard to muscle gain and fat loss for men and women:
It increases muscle mass, increases protein synthesis, strengthens bone, internally makes your metabolism “younger,” and is, to a large degree, “anti-aging” in its effects. And it does this in large part by stimulating the uptake of amino acids in the cells.
In fact, GH is so closely tied to amino acids, that not only does GH stimulate the uptake of aminos, but taking aminos stimulates the release of GH to get the cells to take in the aminos.
Intermittent fasting has become increasingly popular over the last couple of decades, and many people are curious whether it is right for them.
Those who believe they have a “slow” metabolism are especially concerned that any form of fasting might further slow the metabolism, leaving them feeling groggy or less energetic, not to mention hungry.
Surprisingly, this couldn’t be further from the truth.
Intermittent fasting can improve your metabolism while helping you lose weight, along with a slew of other health benefits.
So-called “energy drinks” litter the shelves in health food stores and grocery stores. Each brand promises to deliver the energy boost you need for workouts or just to make it through the day.
The sad truth is that most commercial drinks and drink powders come with a steep price to your health.
Most of the popular brands contain stimulants such as caffeine and high levels of sugar. They make you feel jittery and wired, with a crash that comes soon after.