Calcium and Vitamin D Supplementation for Postmenopausal Women

Understanding the Evidence Landscape

The U.S. Preventive Services Task Force recommends against daily supplementation with 400 IU or less of vitamin D3 and 1000 mg or less of calcium for primary fracture prevention in community-dwelling postmenopausal women (Grade D recommendation) 1, 4
There is insufficient evidence to assess the benefits and harms of higher doses (>400 IU vitamin D3 and >1000 mg calcium) 1, 4, 6
The use of low-dose calcium (≤1000 mg) and vitamin D (≤400 IU) provides no benefit and increases kidney stone risk 1, 2, 3

The National Osteoporosis Foundation recommends at least 1200 mg calcium daily for those older than 50 years 3
The National Osteoporosis Foundation recommends 800-1000 IU vitamin D daily for adults aged 50 and older 3
Target total daily intake (from all sources): 1200 mg calcium and 600-800 IU vitamin D for women aged 51-70 years 2, 3

Calcium supplementation increases kidney stone risk (small but confirmed) 1, 5, 7
Dietary calcium from food has been associated with lower kidney stone risk compared to supplements 3
The American Society for Bone and Mineral Research found insufficient evidence to conclude calcium supplements cause cardiovascular events, but acknowledges uncertainty 7
Vitamin D supplementation is effective in preventing falls in community-dwelling adults aged 65 years or older who are at increased risk for falls (Grade B recommendation) 1, 6

The American College of Physicians and the National Osteoporosis Foundation suggest assessing current dietary calcium and vitamin D intake through a brief dietary history 3
The American Academy of Family Physicians recommends food sources first to reach 1200 mg calcium and 800-1000 IU vitamin D daily 2, 3
If supplementation is necessary, prescribe calcium citrate 500-600 mg twice daily plus vitamin D3 800-1000 IU daily (not the low doses that have been proven ineffective) 3