Does Calcium Supplementation work?

The current Migaku evidence database contains 2 reusable source documents for Calcium Supplementation. This answer focuses on strength of evidence and what the studies can or cannot prove. - Calcium supplementation during pregnancy reduces the risk of these disorders and is recommended for pregnant women with low dietary calcium intake to prevent preeclampsia. [Romero IB (2025); evidence level 2] - We found pregnancy-related guidelines published between 2007 and 2024 in 92 countries of the 194 countries included in this review (47.4%), of which 58 (63%) included calcium intake recommendations, and 29 recommended calcium supplementation with doses varying from 0.5 to 2 g of elemental calcium per day. [Romero IB (2025); evidence level 2] - In several countries, pregnant women have suboptimal intakes of calcium and high rates of mortality due to maternal hypertensive disorders. [Romero IB (2025); evidence level 2] Evidence levels are sorting aids, not final clinical grades. Level 1 usually indicates systematic-review style evidence, level 2 indicates randomized trials or public-health guidance, and lower levels need more cautious wording. This page is educational. People with medical conditions, pregnancy, medication use, or unusual symptoms should ask a qualified clinician before changing supplements, medication, or treatment routines.