http://www.vitamindcouncil.org/about-vitamin-d/vitamin-d-and-other-vitamins-and-minerals/The way that vitamins and minerals work in your body is interconnected. How well vitamin D works depends on the amount of other vitamins and minerals that are present in your body. The other vitamins and minerals needed to help vitamin D work well are called cofactors.
To get the most benefit from vitamin D, you must have other cofactors in your body. Vitamin D has a number of cofactors; the ones listed below are the most important.
http://www.naturalnews.com/029195_magnesium_vitamin_D.html#Vitamin D, just like all other nutrients, works in harmony with several other nutrients to perform its many functions. Most importantly, vitamin D requires and 'uses up' magnesium to convert from supplements or sun into its active form in the blood. As such, it is a big mistake to simply take large doses of Vitamin D without taking the need for magnesium into consideration. Yet this is exactly what is happening in most cases and it is causing a lot of people to have problems that they believe are due to side effects of Vitamin D- or even worse they believe they are experiencing an overdose. Such a huge number of people have subtle magnesium deficiency that some researchers and doctors are calling magnesium deficiency an epidemic, and anyone with even a mild or 'subclinical' magnesium deficiency will have this deficiency amplified when Vitamin D is taken. This is creating some uncomfortable 'Side Effects of Vitamin D' that are actually symptoms of an induced magnesium deficiency! Some of the magnesium deficiency symptoms being attributed to Vitamin D are:
While there are always going to be those who simply can't tolerate taking Vitamin D supplements for one reason or another, the good news is that the vast majority of these problems can be prevented and even reversed by getting clinically significant amounts of magnesium - while you are getting your Vitamin D from pills or from the sun.
Vitamin D Absorption Problems
Conversely, it's also true that taking Vitamin D may not raise blood levels in those who are magnesium deficient. In many cases, both the Vitamin D deficient person and their doctor believe that they are having 'absorption' problems. This lack of knowledge about the need for magnesium ends up causing serious issues such as:
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