Cardiovascular Risks of Calcium Supplementation in Postmenopausal Adults

Introduction to Cardiovascular Risks

• The American Society for Bone and Mineral Research found insufficient evidence to conclude that calcium supplements cause cardiovascular events, but notes the uncertainty and potential for risk 1, 3
• The U.S. Preventive Services Task Force noted that a meta-analysis suggests an association between calcium use and increased cardiovascular disease risk, emphasizing this link has not been consistently demonstrated 4, 5

Dietary Recommendations

• Women over 50 years need 1200 mg/day total calcium intake, with dietary sources preferred over supplements 1, 3, 6
• Upper limits are 2000 mg/day for those over 50 years 1, 3, 6

Supplementation Guidance

• If supplementation is necessary, use the minimum dose needed to reach recommended intake, and divide doses to no more than 500 mg elemental calcium at one time 6
• Inform patients about the potential cardiovascular risk, though unproven 1, 2, 3
• Document the confirmed risk of nephrolithiasis (HR 1.17; NNH = 273) 4, 5, 7, 6

Clinical Approach

• The USPSTF recommends against routine daily supplementation with ≤1000 mg calcium in postmenopausal women based on lack of fracture benefit and increased kidney stone risk 1, 3
• There is insufficient evidence to recommend routine calcium supplementation in community-dwelling adults 1, 3