Myth-buster
Calcium before pregnancy failed to budge maternal death risk in a meta-analysis of 1,355 women — low-certainty evidence leaves the question unresolved.
This null result directly contradicts the common belief that calcium supplementation in pregnancy is a proven lifesaver — yet the evidence is too weak to say it doesn't work, so the picture remains genuinely uncertain.
In one trial of 1,355 women, starting 1,000 mg/day of calcium carbonate before pregnancy had no detectable effect on maternal death (risk ratio 1.00). The same study also found no effect on pre-eclampsia, pregnancy loss, preterm delivery, or stillbirth — and serious adverse events were reported. Because this is the only indexed trial so far, the finding is hypothesis-generating, not conclusive.
Where this fits in the evidence
This is among the first studies we've indexed on Calcium for Reduced Maternal Mortality — treat it as an early signal until more research accumulates.
The study
- Meta-Analysis
- n = 1,355
- 2025-09-18
- The Cochrane database of systematic reviews
This is a plain-language summary of a research finding, not medical advice. Pillser surfaces research signals to help you decide what's worth investigating — always consult a qualified professional before changing what you take.