The folks at Johns Hopkins beg to differ ...
https://www.hopkinsmedicine.org/health/wellness-and-prevention/calcium-supplements-should-you-take-them
The Best Calcium Supplement is None
The truth is, the research is inconclusive. But there is a growing body of evidence that suggests no health benefit, or even worse, that calcium supplements may be harmful.
While taking calcium supplements may produce unwanted side effects, meeting your calcium needs through your diet is safe.
Most people can get adequate calcium through their diet if they make an effort.