Very curious to see if Chris has any thoughts on this; I have had similar experiences with over 400 mg of magnesium in any form.. I’ve tried various chelates versions. I’m also wary of mega-dosing with supplements. My father has tried all kinds of mega-doses of all these things over the last decade to get off meds and still ends up with scarily high bp after a month or so off meds. Everything in moderation and I think sometimes that has to include conventional medication. Side effects at this late stage in his life can’t be as bad as a potentially debilitating stroke 🙁
In addition to these methods being effective, other lifestyle changes and diet adjustments may also be useful in lower blood pressure. One study explains that losing weight can have a significant positive impact on patients that have been diagnosed with hypertension. Even small reductions in bodyweight amongst those individuals who are both obese and hypertensive can yield life-saving benefits. Dietary changes can also help. In particular, the patient should aim to lower their daily intake of sodium, which causes an elevation in blood pressure. The patient should also focus on obtaining more calcium, potassium and other minerals that are useful in balancing blood pressure levels. Fiber, fruits and a lot of vegetables should also be an essential part of the patient’s daily diet.

Research shows that turmeric can reduce hypertension by regulating the activity of angiotensin receptors and thereby preventing the blood vessels from constricting. Not only curcumin, turmeric oil fraction, and turmerone also demonstrate similar activity. Turmeric by itself is not easily absorbed into the body. When speaking with a cardiac-surgeon I know, he told me that I needed to put a pinch of fresh black pepper on my tongue. This allows the body to absorb the turmeric increasing the efficacy. A WARNING: Taking turmeric over an extended period of time can cause bleeding. My clotting factors were off when I had been on it long term postponing my surgery by 2 weeks.
A study published in the American Journal of Clinical Nutrition looked at how eating whole grains affected blood pressure in middle-aged people. British researchers compared a diet of whole wheat (or whole wheat plus oats) to a diet of refined grains. They found that eating three servings of whole grains was linked with a reduction in systolic blood pressure. Exactly why isn't clear, athough other research has pointed to beneficial effects of whole grains on cholesterol.
Vitamin D. Vitamin D deficiency is associated with increased risk of developing hypertension (20), and large doses of vitamin D (50,000 IU per week) have been shown to lower blood pressure over eight weeks (21). One mechanism by which vitamin D may lower blood pressure is through suppressing renin, which regulates mean arterial blood pressure (22). Sun exposure is an easy and cheap way to get vitamin D.

Blood pressure is the force of blood pushing against the walls of arteries. When the doctor measures your blood pressure, the results are given in two numbers. The first number, called systolic blood pressure, is the pressure caused by your heart contracting and pushing out blood. The second number, called diastolic blood pressure, is the pressure when your heart relaxes and fills with blood. Your blood pressure reading is usually given as the systolic blood pressure number over the diastolic blood pressure number, such as 138/72. Normal blood pressure for adults is defined as a systolic pressure of less than 120 and a diastolic pressure of less than 80. This is stated as 120/80.

Ginger, the spicy root often used in Asian cooking, could also help lower blood pressure. According to M. Jan Ghayur and A. Gilani from The Aga Khan University Medical College in Pakistan and published in the January 2005 issue of the "Journal of Cardiovascular Pharmacology," ginger can reduce blood pressure by blocking the voltage-dependent calcium channels. MedlinePlus agrees that ginger does reduce high blood pressure, but individuals who take medication for their high blood pressure should use ginger with precaution because ginger might lower it too much or cause an irregular heartbeat.