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Calcium (+ D3 + K2)

Evidence: ★★★★☆ · Status: OTC Supplement

💡 Did you know? 99% of your calcium is in bone — but blood calcium is so critical that if your diet runs short, your body dismantles bone to keep the blood level perfect.

In plain English

The raw material of bone — but useless without D3 to absorb it and K2 to aim it at your skeleton instead of your arteries.

How it works

Hydroxyapatite mineral substrate; D3 drives absorption, K2 (via matrix-Gla protein) directs calcium to bone not arteries. Best from diet + resistance training.

Molecular target & official sources

CASR calcium-sensing receptor (NCBI Gene) · Calcium (PubChem CID 271)

Bottom line

Always pair with D3 + K2; don't megadose alone.

Helps with: Bone Health

Availability & where to buy

Available over the counter. Widely available OTC — e.g. iHerb (ships worldwide); in Singapore also Guardian, Watsons, GNC, Shopee / Lazada. Look for a third-party-tested / GMP mark and check the dose per serving.

Used in these protocols

Compare Calcium (+ D3 + K2)

Common questions

Does Calcium (+ D3 + K2) actually work?

Human-evidence rating: 4 of 5. Always pair with D3 + K2; don't megadose alone.

Is Calcium (+ D3 + K2) legal or approved?

Regulatory status: OTC Supplement.