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Supplement

Calcium

Also known as: calcium carbonate, calcium citrate, Calcichew, Adcal

An essential mineral for bone health, muscle function, and nerve signalling. Postmenopausal women are at increased risk of calcium deficiency and osteoporosis due to declining oestrogen. The UK RNI is 700mg/day, though many postmenopausal women require supplementation alongside vitamin D, particularly if dietary intake is low.

This page contains self-reported experiences from the Narrated community — not clinical data. Outcomes are subjective. Always consult your doctor or specialist before starting, stopping, or changing any approach.

Regulatory status does not mean an approach is safe or unsafe. Laws vary by country — check your local regulations.

Community Experiences

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Research Context

Research context compiled from published sources

How does Calcium work?

Calcium is incorporated into bone matrix as hydroxyapatite, providing structural strength. Also essential for muscle contraction, nerve impulse transmission, blood clotting, and intracellular signalling. Adequate calcium intake reduces parathyroid hormone (PTH) secretion, which otherwise mobilises calcium from bone.

Research Depth

Well Studied

Extensive human research over many years, including randomized controlled trials.

Long-Term Evidence

Well Characterized

Decades of long-term safety data available from human use.

Known Interactions
Iron supplements (reduce absorption — take separately)Thyroid medications (reduce absorption — separate by 4 hours)Bisphosphonates (reduce absorption — separate by at least 30 minutes)Tetracycline antibiotics (reduce absorption)
Reported Contraindicated Populations
HypercalcaemiaSevere renal impairment (risk of hypercalcaemia)Sarcoidosis
Published Dose Ranges
5001200 mg/dayoral · once or twice daily with food (carbonate form) or anytime (citrate form)
NHS/NICE

Dose ranges from published research. Individual dosing should be determined with your healthcare provider based on your specific circumstances.

Factual research context from published sources — not a safety assessment or recommendation. Research classifications may change as new data emerges.

Related Approaches

Other Supplement tracked on Narrated.

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