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Vitamin D. Side Effects of Vitamin D is that it uses up more magnesium. And those who are already slightly magnesium deficient can get 'pushed over the edge' to have some symptoms from that.

from EverydayHealth.com

Vitamin D - Side Effects, Dosage, Interactions - Drugs

Vitamin D helps your body absorb calcium and phosphorous, which are both needed for bone formation. It also assists in muscle, heart, lung, and brain function.