vitamin D - for those supplementing with it, know what you need in addition

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http://www.westonaprice.org/basicnutrition/vitamindmiracle.html

Actually, vitamin D does not in itself promote healthy bone. Vitamin D

controls the levels of calcium in the blood. If there is not enough

calcium in the diet, then it will be drawn from the bone. High levels

of vitamin D (from the diet or from sunlight) will actually

demineralize bone if sufficient calcium is not present.

Vitamin D will also enhance the uptake of toxic metals like lead,

cadmium, aluminum and strontium if calcium, magnesium and phosphorus

are not present in adequate amounts.18 Vitamin D supplementation should

never be suggested unless calcium intake is sufficient or supplemented

at the same time.