What dose of Calcium Citrate is effective for Kidney stone risk?

Calcium Citrate at 600 mg lands inside the studied 400-1000 mg window. DoseRank scores this product's dose fit at 74 out of 100.

How much does the best Kidney stone risk supplement cost?

NOW Foods, Calcium Citrate, Pure Powder, 8 oz (227 g) works out at $0.15 per serving. $0.15 per serving — mid price tier for this outcome. The cheapest ranked pick here is $0.10 per serving.

Does DoseRank get paid to rank a product first?

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.

The short answer · Kidney stone risk

Take calcium citrate for kidney stone risk. This is the one to buy.

NOW Foods, Calcium Citrate, Pure Powder, 8 oz (227 g)

4.8· 6,791 ratings· $0.15/serving

DoseRank score84

Calcium Citrate 600 mg — inside the studied 400-1000 mg window

Of 8,728 products scored for Kidney stone risk, NOW Foods, Calcium Citrate, Pure Powder, 8 oz (227 g) ranks #1 with a DoseRank score of 84. Calcium Citrate has moderate human evidence for this outcome.

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Cheaper alternative$0.13 per serving21st Century, Calcium Citrate + D3 Maximum, 120 Tablets

Retailer links may be affiliate links. Rankings and placement are never paid.

The form“Why Calcium Citrate — not Calcium Carbonate or Vitamin D3 (Cholecalciferol)?”

Calcium Citrate has moderate human evidence for this outcome.

Calcium CitrateThe pick
Moderate evidence · 600 mg
Calcium bound to citric acid; absorbed well even without food or with low stomach acid, so it suits older adults and PPI users.
Calcium Carbonate
Moderate evidence · 500 mg (calculated)
The cheapest, most concentrated calcium form at 40% elemental; needs stomach acid, so take with food and expect weak uptake on acid-reducing medications.
Vitamin D3 (Cholecalciferol)
Moderate evidence · 12.5 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.

Buy the #1 pick

The dose“Is the dose actually effective?”

Calcium Citrate at 600 mg lands inside the studied 400-1000 mg window.

Calcium Citrate

Studied window 400-1000 mg · this pick 600 mg

The ranking“Why should I trust this pick?”

Strong trust signals — consistently high marks from verified buyer ratings. Each product gets a DoseRank score blending clinical strength, evidence, dose fit, trust and value. Retailer links may be affiliate links — the scoring model decides placement, never payment from a brand.

8,728 products scored
Never paid placement
Evidence level: Moderate · 78
577 brands
23 ingredients

See the full analysis — every score, every product How the ranking works

The price“Can I do better than $0.15 a serving?”

$0.15 per serving — mid price tier for this outcome. The cheapest ranked pick here is $0.10 per serving.

9
21st Century, Calcium Citrate Petites + D3, 200 Coated TabletsScore 81 · $0.10/serving
iHerb
3
21st Century, Calcium Citrate + D3 Maximum, 120 TabletsScore 83 · $0.13/serving
iHerb

Why not the absolute cheapest? The DoseRank score also weighs clinical strength, evidence, dose fit and trust — the very cheapest listings rarely hold up everywhere else.

Ready?

The #1 pick is $0.15 a serving.

NOW Foods, Calcium Citrate, Pure Powder, 8 oz (227 g) — in stock at a tracked retailer.

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Questions

Frequently asked

NOW Foods, Calcium Citrate, Pure Powder, 8 oz (227 g) ranks #1 for Kidney stone risk with a DoseRank score of 84. The score blends clinical strength, evidence, dose fit, trust signals and value across 8,728 products scored for this outcome.

Frequently asked