Kana Wu, MD, PhD, Research Scientist in the Department of Nutrition at the Harvard School of Public Health, et al., in their study "Calcium Intake and Risk of Colon Cancer in Women and Men," published Mar. 20, 2002 in the Journal of the National Cancer Institute, concluded:

“Higher calcium intake is associated with a reduced risk of distal colon cancer. The observed risk pattern was consistent with a threshold effect, suggesting that calcium intake beyond moderate levels may not be associated with a further risk reduction.”

Mar. 20, 2002