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Vitamin D and Athletic Performance
We've already noted here that Vitamin D is a possible performance enhancer for athletes.
Here's a recent study that adds credance to that view. Austrian scientists
"...examined the blood of 2300 men with an average age of just over sixty. Only eleven percent of them had sufficient vitamin D in their blood. And indeed: more vitamin D in their blood had the men, the higher their testosterone and unbound testosterone concentration."
The same group also examined seasonal variation of testosterone and found that testosterone along with Vitamin D levels in the blood are highest in the summer months.
Testosterone levels have long been associated with athletic performance and muscle building.
http://ergogenics.org/supplement196.html#1 (Click the Google Translate button at the top of the page to read in English.)