{
  "name": "Calcium Supplement Label Census and Cost per 500 mg",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "attribution": "Verified Supplement Data, https://verifiedsupplementdata.com/calcium/best-overall/",
  "methodology": "elemental calcium on the Supplement Facts panel, never compound weight. Per-dose ceiling 500 mg (NIH: absorption from supplements is highest at 500 mg or less); upper limit 2500 mg. Each finding recomputed in both halves of the DSLD read order; only findings that agreed are exported. Cost per 500 mg = brand list price / (elemental mg per serving x servings) x 500 (Vitacost or Target where the brand store blocked reads or shows no price).",
  "labelCensus": {
    "source": "NIH Dietary Supplement Label Database",
    "onMarketCalciumLabelsAnyForm": 31377,
    "labelsRead": 499,
    "labelsWithDose": 495,
    "excludedImplausible": 1,
    "perDoseCeilingMg": 500,
    "upperLimitMg": 2500,
    "findings": {
      "median_serving_mg": 500,
      "over_ceiling_per_serving": 48.7,
      "over_ul_per_day": 0.2,
      "over_ceiling_per_unit": 20.6,
      "carbonate_over_ceiling": 78.4,
      "carbonate_n": 134,
      "citrate_over_ceiling": 52.8,
      "citrate_n": 106
    },
    "notPublished": [
      "median_per_unit_mg"
    ]
  },
  "costPer500Mg": [
    {
      "name": "Caltrate 600+D3",
      "brand": "Caltrate",
      "form": "calcium carbonate",
      "elementalMgPerServing": 600,
      "servingSize": "1 tablet",
      "vitaminD": "800 IU (20 mcg)",
      "otherActives": null,
      "score": 7,
      "listPriceUsd": 16.79,
      "servings": 200,
      "priceSeller": "target.com",
      "priceCheckedOn": "2026-10-12",
      "costPer500MgUsd": 0.07,
      "testingList": null,
      "nihDsldId": "202235"
    },
    {
      "name": "Nature Made Calcium, Magnesium and Zinc with D3",
      "brand": "Nature Made",
      "form": "calcium carbonate",
      "elementalMgPerServing": 333,
      "servingSize": "1 tablet",
      "vitaminD": "200 IU (5 mcg)",
      "otherActives": "magnesium 133 mg, zinc 5 mg",
      "score": 10,
      "listPriceUsd": 13.99,
      "servings": 300,
      "priceSeller": "naturemade.com",
      "priceCheckedOn": "2026-10-12",
      "costPer500MgUsd": 0.07,
      "testingList": "USP Verified",
      "nihDsldId": "272562"
    },
    {
      "name": "Nature Made Calcium 600 mg with D3",
      "brand": "Nature Made",
      "form": "calcium carbonate",
      "elementalMgPerServing": 600,
      "servingSize": "1 tablet",
      "vitaminD": "400 IU (10 mcg)",
      "otherActives": null,
      "score": 10,
      "listPriceUsd": 21.69,
      "servings": 220,
      "priceSeller": "naturemade.com",
      "priceCheckedOn": "2026-10-12",
      "costPer500MgUsd": 0.0822,
      "testingList": "USP Verified",
      "nihDsldId": "271313"
    },
    {
      "name": "Nature's Bounty Calcium 1200 mg with D3",
      "brand": "Nature's Bounty",
      "form": "calcium carbonate",
      "elementalMgPerServing": 1200,
      "servingSize": "2 softgels",
      "vitaminD": "1,000 IU (25 mcg)",
      "otherActives": null,
      "score": 4.5,
      "listPriceUsd": 13.63,
      "servings": 60,
      "priceSeller": "vitacost.com",
      "priceCheckedOn": "2026-10-12",
      "costPer500MgUsd": 0.0947,
      "testingList": null,
      "nihDsldId": "308192"
    },
    {
      "name": "21st Century Calcium Citrate + D3 Petites",
      "brand": "21st Century",
      "form": "calcium citrate",
      "elementalMgPerServing": 400,
      "servingSize": "2 tablets",
      "vitaminD": "500 IU (12.5 mcg)",
      "otherActives": null,
      "score": 7,
      "listPriceUsd": 10.99,
      "servings": 100,
      "priceSeller": "21stcenturyvitamins.com",
      "priceCheckedOn": "2026-10-30",
      "costPer500MgUsd": 0.1374,
      "testingList": null,
      "nihDsldId": "326321"
    },
    {
      "name": "Citracal Petites",
      "brand": "Citracal (Bayer)",
      "form": "calcium citrate",
      "elementalMgPerServing": 400,
      "servingSize": "2 caplets",
      "vitaminD": "500 IU (12.5 mcg)",
      "otherActives": null,
      "score": 7,
      "listPriceUsd": 13.01,
      "servings": 100,
      "priceSeller": "vitacost.com",
      "priceCheckedOn": "2026-10-12",
      "costPer500MgUsd": 0.1626,
      "testingList": null,
      "nihDsldId": "285630"
    },
    {
      "name": "Citracal Maximum Plus",
      "brand": "Citracal (Bayer)",
      "form": "calcium citrate",
      "elementalMgPerServing": 650,
      "servingSize": "2 caplets",
      "vitaminD": "1,000 IU (25 mcg)",
      "otherActives": "zinc 5.5 mg, copper, manganese",
      "score": 5.5,
      "listPriceUsd": 13.01,
      "servings": 60,
      "priceSeller": "vitacost.com",
      "priceCheckedOn": "2026-10-12",
      "costPer500MgUsd": 0.1668,
      "testingList": null,
      "nihDsldId": "285629"
    },
    {
      "name": "Solgar Calcium Citrate with D3",
      "brand": "Solgar",
      "form": "calcium citrate",
      "elementalMgPerServing": 1000,
      "servingSize": "4 tablets",
      "vitaminD": "600 IU (15 mcg)",
      "otherActives": null,
      "score": 4.5,
      "listPriceUsd": 20.85,
      "servings": 60,
      "priceSeller": "vitacost.com",
      "priceCheckedOn": "2026-10-12",
      "costPer500MgUsd": 0.1738,
      "testingList": null,
      "nihDsldId": "217447"
    },
    {
      "name": "NOW Calcium Citrate with Minerals and D",
      "brand": "NOW Foods",
      "form": "calcium citrate",
      "elementalMgPerServing": 600,
      "servingSize": "2 tablets",
      "vitaminD": "400 IU (10 mcg) as D2",
      "otherActives": "magnesium 300 mg, zinc 15 mg, copper, manganese",
      "score": 5,
      "listPriceUsd": 26.49,
      "servings": 125,
      "priceSeller": "vitacost.com",
      "priceCheckedOn": "2026-10-12",
      "costPer500MgUsd": 0.1766,
      "testingList": null,
      "nihDsldId": "313645"
    },
    {
      "name": "Thorne Calcium",
      "brand": "Thorne",
      "form": "dicalcium malate",
      "elementalMgPerServing": 250,
      "servingSize": "1 capsule",
      "vitaminD": null,
      "otherActives": null,
      "score": 10,
      "listPriceUsd": 28,
      "servings": 120,
      "priceSeller": "thorne.com",
      "priceCheckedOn": "2026-10-12",
      "costPer500MgUsd": 0.4667,
      "testingList": "NSF/ANSI 173",
      "nihDsldId": "336311"
    },
    {
      "name": "Momentous Calcium",
      "brand": "Momentous",
      "form": "dicalcium malate",
      "elementalMgPerServing": 250,
      "servingSize": "1 capsule",
      "vitaminD": null,
      "otherActives": null,
      "score": 10,
      "listPriceUsd": 16.99,
      "servings": 60,
      "priceSeller": "livemomentous.com",
      "priceCheckedOn": "2026-10-12",
      "costPer500MgUsd": 0.5663,
      "testingList": "NSF Certified for Sport + NSF/ANSI 173",
      "nihDsldId": null
    }
  ]
}