Calcium Supplementation for Premenstrual Syndrome

Recommended Dosing Strategy

• Divided doses of ≤500 mg elemental calcium optimize absorption and minimize gastrointestinal side effects, according to the American College of Nutrition 1, 2
• Calcium carbonate is the most cost-effective option, providing 40% elemental calcium content, though it should be taken with meals for optimal absorption, as recommended by the National Institutes of Health 1

Supplement Selection

• Calcium carbonate requires gastric acidity for absorption and should be taken with meals, as suggested by the American Gastroenterological Association 1, 2
• For women with GERD or taking acid-reducing medications, calcium citrate (21% elemental calcium) is preferred as its absorption is independent of gastric acidity, according to the American College of Gastroenterology 1, 2

Dietary Calcium Considerations

• Women of reproductive age (19-50 years) require 1000 mg elemental calcium daily from all sources, as recommended by the National Institutes of Health 3, 5
• Most adults consume approximately 300 mg calcium from non-dairy sources, with additional intake from dairy products, according to the Academy of Nutrition and Dietetics 6

Common Pitfalls to Avoid

• Calcium intake above 2500 mg/day should be avoided due to increased risk of kidney stones, as warned by the American Urological Association 3, 4
• Supplement use (but not dietary calcium) modestly increases nephrolithiasis risk, so prioritize dietary sources when possible, according to the National Kidney Foundation 3, 4