Magnesium activates vitamin D

People who take vitamin D supplements but who have low magnesium levels may not be getting a vitamin D benefit. 

Without enough magnesium, vitamin D stores in the body remain inactive, and taking vitamin D supplements when magnesium is low can raise circulating calcium and phosphate levels, possibly leading to blood vessel calcification.

When magnesium levels are good, the body needs less vitamin D to reach adequate D levels, and inactive vitamin D stores become active. Also, when magnesium and vitamin D levels are optimal, chances for bone thinning (osteoporosis) and bone fracture are less.

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