The calcium problem can be affected by both Vitamin K and magnesium. I have been taking 400mg magnesium glycinate and 1/2 tsp of magnesium chloride per day to increase my magnesium and might start taking even more. Remember the magnesium is also a strong laxative in some forms so the protocol needs to be adjusted for convenience.
The calcium deposits can go beyond arterial deposits and be a problem with kidneys, joints, tendons and muscles for example. Here is some good information by Mark Sircus: https://drsircus.com/magnesium/
Massive magnesium deficiencies in the general population have led to a tidal wave of sudden coronary deaths, diabetes, strokes and cancer.
And this by Thomas E. Levy here: https://riordanclinic.org/2016/02/the-miracle-of-magnesium/
What can be done to lower elevated intracellular calcium levels? Arguably the single best answer to this question is magnesium. Magnesium has long been regarded as a natural, or orthomolecular, calcium channel blocker. Calcium enters cells through defined calcium channels, and agents that can block these channels will reliably reduce intracellular levels of calcium.
Edit: Just ordered the Koncentrated K supplement. This is much more potent than the Super K and there is a lot of good information there:
https://www.k-vitamins.com