According to a research study by Dr. Christopher Li and his colleagues from the Fred Hutchinson Cancer Research Center in Seattle, Washington, a woman who takes calcium ‘channel blockers for her blood pressure (for example, amlodipine (Norvasc) or nicardipine (Cardene)) has about a 250 percent increased risk of developing breast cancer (JAMA Internal Medicine)
The study followed almost 3,000 women, 1,055 of who had been diagnosed with lobular breast cancer, 905 with ductal and a control group of 891 women. The research period was from 2000 to 2008. About 40 per cent of the women took calcium channel blockers for high blood pressure.
Results showed a 2.4 to 2.6 times increased risk.
At CANCERactive we have long been concerned that too much calcium may, in fact, both cause cancer and worsen the cancer in people already diagnosed and we have carried negative research on calcium supplements in these pages before.