Vitamin D plays a role in regulating blood pressure by influencing the renin-angiotensin-aldosterone system, which helps control blood pressure and fluid balance in the body. Many blood pressure issue are directly related to a vitamin d deficiency and you will see that once you correct this issue you will correct your blood pressure problem. There are other factors that contribute to high blood pressure as well so it's important that you turn over every stone when trying to get to the root cause