Moreover, magnesium deficiency is common, with magnesium tending to be inadequate in processed foods, poorly absorbed, and easily eliminated by common diuretics and proton pump antacids. The best corrective supplements are in amino acid chelated form, with magnesium L-threonate the best in transiting the blood-brain barrier.
Notably, inadequate magnesium tends to promote calcium retention and calcification in the cardiovascular system. Residents in areas with magnesium rich hard water tend to have better cardiovascular health. I suspect that magnesium rich domestic and bottled water may be one of the reasons for the so-called French paradox of a rich diet but relatively good cardiovascular health.
The bottom line: if you are taking vitamin D for cardiovascular health, add in magnesium as magnesium glycinate or magnesium L-threonate.
Another consideration is adding vitamin K2-MK7 to the supplement list.