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Moderate human evidenceEssential mineral / skeletal and cellular signaling

Calcium

Calcium gives bones and teeth structure and supports muscle, nerve and clotting processes. More supplemental calcium does not automatically prevent fractures.

Also indexed as: Calcium carbonate · Calcium citrate · Ca

A clear starting point

Calcium gives bones and teeth structure and supports muscle, nerve and clotting processes. More supplemental calcium does not automatically prevent fractures.

Systems mapping shows biological relevance, not a treatment recommendation or a patient CPI score.

Molecular formula: Ca

No validated chemical structure is displayed in this edition.

How it works

Skeletal mineral balance / electrical and contractile signaling

Calcium gives bones and teeth structure and supports muscle, nerve and clotting processes. More supplemental calcium does not automatically prevent fractures.

Targets & processes
Calcium-dependent cellular signaling and structural bone mineral; not one receptor.
Systems & tissues
Bone, teeth, nerves, muscle and blood-clotting systems.

What does the evidence show?

Essential role in skeletal health and avoiding deficiency. Fracture-prevention results from supplementation depend on population, baseline intake and co-interventions.

What this does not establish

A bone-building role does not establish universal fracture prevention. Carbonate and citrate composition/tolerability are not identical.

NIH ODS: Calcium — Health Professional Fact Sheet

Official educational / regulatory source · Official educational source

Essential role in skeletal health and avoiding deficiency. Fracture-prevention results from supplementation depend on population, baseline intake and co-interventions.

Limitations: A bone-building role does not establish universal fracture prevention. Carbonate and citrate composition/tolerability are not identical.

Citation metadata from PubMed, a service of the U.S. National Library of Medicine, NIH. A citation match is not a guarantee of study quality. Abstracts are not full-text reviews.

Safety is a separate question

Constipation and gastrointestinal discomfort can occur. Supplemental calcium may increase kidney-stone risk; cardiovascular findings remain debated.

Contraindications & cautions

Hypercalcemia, kidney-stone history or significant kidney disease require clinician assessment.

Medication & supplement interactions

Calcium can interfere with levothyroxine, dolutegravir and some antibiotics; lithium can affect calcium regulation.

Regulatory status · United States

United States: dietary-supplement status is product-specific, not FDA approval of disease treatment. Food, supplement and drug formulations must not be assumed interchangeable.

Read the official source

This is not an exhaustive safety list. Regulatory status varies by jurisdiction and product; investigational use is not approval.

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Education, not a prescription. Research summaries are not medical advice, dosing instructions, or an offer to sell. Mechanistic findings do not establish clinical effectiveness. US regulatory status is product- and indication-specific and may change. Discuss health decisions with a licensed clinician.