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D3 vs D3+K2, What Is K2 MK-7, and Is 4000 IU Safe?
D3 vs D3+K2 (both vitamins support normal bones), what vitamin K2 MK-7 is (a well-absorbed form), and a straight answer on whether 4000 IU vitamin D is safe daily (it's the recognised tolerable upper limit for adults).
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