yep...makes my blood pressure go up too...nobody can explain why..
That is easy. Vitamin D raises serum calcium, which in turn raises blood pressure. This is because calcium is a muscle contractor, including the muscles of the arteries. This is why calcium channel blockers (CCBs) and magnesium are both used to lower blood pressure in many cases. Both CCBs and magnesium work by keeping calcium out of the nerve synapse, which in turn keeps arteries relaxed thus lowering the blood pressure.