I tried to find more information on this topic:
The calcium from supplements is not the same as calcium found in foods.
https://saveourbones.com/can-calcium-cause-brain-lesions-kidney-stones-and-heart-attacks/
Typical calcium supplements contain inorganic calcium (carbonate, citrate, dolomite, di-calcium phosphate, tri-calcium phosphate, coral, oyster shell or bone meal). Only a small amount of this “rock” calcium gets absorbed, so the remainder gets lodged in tissues where it doesn’t belong (such as the heart).
Second, the amount of calcium matters. Large amounts of inorganic calcium (participants took 500mg or more in the study) cannot be assimilated by the body. As noted above, only a small amount of this calcium is processed.
The more rock-like calcium you take, the more ends up in various body tissues…and not just your cardiovascular tissue, as you’ll learn next.