Calcium

Calcium supplement forms studied in human research

The strongest current support is for blood pressure in non-pregnant adults. Other uses on this page have narrower, weaker, or not-yet-clear evidence.

What the research says

Each row is a different health effect. A means the support looks strongest, B likely helpful, C mixed or modest, and — not enough human evidence yet.

B · Likely helpful

Blood pressure in non-pregnant adults

The research suggests this may help with blood pressure in non-pregnant adults in the studied settings. Broader claims would go beyond the evidence shown here.

10 papers · 10 research reviews

C · Mixed or limited evidence

Fracture prevention

The research on fracture prevention is mixed, modest, or both. Any claim here should stay narrow and specific.

16 papers · 16 research reviews

Safety

Safety is graded separately from benefits. Read these cautions first, especially if you take medication or have a medical condition.

? Safety evidence unclear Human safety data are limited or inconsistent.

Medication and condition cautions

Safety evidence is limited here, so this should be read cautiously rather than as reassurance.

0 direct human studies

Kidney-stone cautions

Safety evidence is limited here, so this should be read cautiously rather than as reassurance.

0 direct human studies

⚠ Concerning The human evidence points to a meaningful reason for caution.

⚠

Cardiovascular safety concerns

This is a safety note, not a benefit claim. It points to a real reason for caution.

1 direct human study

Quick facts

A quick read on what this page supports right now.

Health effects reviewed

2 health effects reviewed

Best grade shown

B · Likely helpful

Benefits with support

2 uses currently show some level of supportive evidence

Safety rows

3 separate safety or caution rows

Research volume

26 unique research papers across graded uses on this page

What this means

Keep any benefit claims limited to the specific graded uses shown here.

Quality-verified products

Products that pass third-party quality testing.

Product quality data coming soon

Any future product listings should stay aligned with the specific graded outcomes and the separate safety rows shown here.

How we graded Calcium

This page shows the current public rows for Calcium: 26 unique research papers across 2 visible health effects. Safety rows are shown separately from benefit rows when available. The page includes 26 review-level papers and 0 direct human studies. Each supplement is graded by health effect using a certainty × effect matrix applied across PubMed evidence per health effect. Cochrane reviews and high-quality systematic reviews carry the most weight. See Methodology for full detail.

Read the full methodology → · Citation PDF coming soon