The claim
「The more calcium in pregnancy, the better the baby’s bones」
Verdict
MythCalcium beyond what you need does not turn into better bones. The tolerable upper intake level for adults is 2,000–2,500 mg a day, and high-dose calcium supplements may raise the risk of kidney stones; calcium can also interfere with iron absorption, so calcium and iron supplements are best taken at different times. Follow your doctor’s advice, and put food first — dairy, tofu, dark leafy greens.
Sources
NIH ODS · NIH Office of Dietary Supplements
National Institutes of Health, Office of Dietary Supplements. (n.d.). Calcium: Fact sheet for health professionals. https://ods.od.nih.gov/factsheets/Calcium-HealthProfessional/
Direct source · Government / official agency · checked 2026-08-02
NIH ODS · NIH Office of Dietary Supplements
National Institutes of Health, Office of Dietary Supplements. (n.d.). Iron: Fact sheet for health professionals. https://ods.od.nih.gov/factsheets/Iron-HealthProfessional/
Mechanism source ° · Government / official agency · checked 2026-08-02
° Sources with this mark do not address the claim directly; their content supports the mechanism behind the verdict.