Calcium and Blood Pressure:
In some people, an increase in calcium consumption can help control blood pressure without anti-hypertensive medication. A 13-year study by James Dwyer at the University of Southern California School of Medicine found that consuming 1300 milligrams of calcium a day reduced hypertension risk by 12 percent compared to only 300 mg. a day, while subjects under age 40 reduced their risk by up to 25 percent. Dr. Lawrence Resnick, a professor of medicine at Cornell University Medical Center Hypertension Center, emphasizes that the benefits are most pronounced in hypertensives who are salt-sensitive, such as African Americans.

Calcium and Cholesterol:
Dr. Margo Denke, associate professor of internal medicine at the Center for Human Nutrition at the University of Texas Southwestern Medical Center in Dallas found that a high-calcium regimen reduced levels of total cholesterol by six percent and slashed "bad" LDL cholesterol by 11 percent. So-called "good" HDL cholesterol levels remained unchanged.

Calcium and Stroke Prevention:
A 1999 Harvard study reported that calcium supplementation protects against stroke in middle-aged women. In the ongoing Nurses' Health Study, 85,764 women, ages 35 to 59, reported that the mineral was tied to a 32% lower risk of stroke among those with the highest intake of the mineral. Women taking at least 400 mg of calcium supplements had a 12% lower risk of ischemic stroke (the type caused by plaque buildup in blood vessel walls). Dietary calcium, especially in dairy foods, reportedly reduced stroke risk, as did potassium.

Calcium and Osteoporosis:
Osteoporosis strikes more than seven million Americans, mostly women, with another 17 million at serious risk of developing fragile bones that easily collapse, a crippling curving of the spine, and hip fractures. Research shows that boosting calcium intake can halt bone loss, especially when combined with vitamin D, which enhances its absorption.

Calcium and Colon Cancer:
Calcium may protect against growths that become malignant in those prone to colorectal cancer. Dr. Martin Lipkin, a professor of medicine at Cornell University, who first discovered the link between calcium and colorectal cancer, stresses that both calcium-rich foods and calcium supplements will produce the same beneficial effects.

Calcium and Pregnancy:
According to Barbara Levine, director of the human nutrition program at the Rockefeller University, calcium supplements can help ensure the health of the fetus and improve bone mass of the mother. In a study of hypertensive women, Levine found that adequate calcium levels and Vitamin D improved pregnancy outcomes.