The short answer · Fracture risk
Take vitamin d3 (cholecalciferol) & calcium carbonate for fracture risk. This is the one to buy.
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21st Century, Calcium Plus D3, 90 Tablets
4.7· 11,015 ratings· $0.07/serving
DoseRank score92
Vitamin D3 (Cholecalciferol) 20 mcg — below the studied 800-2000 IU window
Of 7,400 products scored for Fracture risk, 21st Century, Calcium Plus D3, 90 Tablets ranks #1 with a DoseRank score of 92. Vitamin D3 (Cholecalciferol) and Calcium Carbonate are the strongest evidence signals for this outcome.
The form“Why Vitamin D3 (Cholecalciferol) & Calcium Carbonate?”Evidence Strong evidence
Vitamin D3 (Cholecalciferol) and Calcium Carbonate are the strongest evidence signals for this outcome.
- Vitamin D3 (Cholecalciferol)The pick
Strong evidence · 20 mcg
The form made by skin on sun exposure and used in most supplements; converts to active calcitriol and raises serum 25(OH)D more effectively than D2.
- Calcium CarbonateThe pick
Strong evidence · 1000 mg
The cheapest, most concentrated calcium form at 40% elemental; needs stomach acid, so take with food and expect weak uptake on acid-reducing medications.
- Calcium Citrate
Strong evidence · 1000 mg
Calcium bound to citric acid; absorbed well even without food or with low stomach acid, so it suits older adults and PPI users.
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21st Century, Calcium Plus D3, 90 Tablets ranks #1 for Fracture risk with a DoseRank score of 92. The score blends clinical strength, evidence, dose fit, trust signals and value across 7,400 products scored for this outcome.
Vitamin D3 (Cholecalciferol) and Calcium Carbonate are the strongest evidence signals for this outcome.
1 of 2 dosed ingredients land in the studied range. Vitamin D3 (Cholecalciferol) at 20 mcg sits below the studied 800-2000 IU window. DoseRank scores this product's dose fit at 56 out of 100.
21st Century, Calcium Plus D3, 90 Tablets works out at $0.07 per serving. $0.07 per serving — low price tier for this outcome. Nothing else in this ranking costs less per serving.
No. Retailer links may be affiliate links, but rankings and placement are never paid. Every product is scored by the same public model, and the ranking is recomputed from the underlying product data rather than edited by hand.
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