Maybe not. This article from 2008 shows increased cardiovascular events in woman randomized to calcium supplementation. I had my mom stop her calcium supplement.
women were included in the study if they had been postmenopausal for more than five years, were aged 55 or more, and had a life expectancy of more than five years. We excluded women who were receiving treatment for osteoporosis or taking calcium supplements; those with an other major ongoing disease including hepatic, renal, or thyroid dysfunction, malignancy, or metabolic bone disease; and those with serum 25-hydroxyvitamin D levels less than 25 nmol/l.
Patients were then randomized to a gram of elemental calcium, as calcium citrate as Citracal or matched placebo.