{
  "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 (Heaney 2000); 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 = Amazon price / (elemental mg per serving x servings) x 500.",
  "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": "Nature Made Calcium 600 mg with Vitamin D3 (220 tablets)",
      "brand": "Nature Made",
      "form": "carbonate",
      "elementalMgPerServing": 600,
      "elementalMgPerUnit": 600,
      "servingSize": "1 tablet",
      "servingsPerContainer": 220,
      "vitaminD3IuPerServing": 400,
      "priceUsd": 11.24,
      "priceVerifiedOn": "2026-10-05",
      "costPer500MgUsd": 0.043,
      "certification": "USP Verified (brand-stated; not confirmed in the public registry)",
      "nihDsldId": "279767",
      "amazonAsin": "B002FH5I0I",
      "availability": "ok"
    },
    {
      "name": "Nature's Bounty Calcium 1200 mg with Vitamin D3 (120 softgels)",
      "brand": "Nature's Bounty",
      "form": "carbonate",
      "elementalMgPerServing": 1200,
      "elementalMgPerUnit": 600,
      "servingSize": "2 softgels",
      "servingsPerContainer": 60,
      "vitaminD3IuPerServing": 1000,
      "priceUsd": 8.86,
      "priceVerifiedOn": "2026-10-05",
      "costPer500MgUsd": 0.062,
      "certification": "None stated",
      "nihDsldId": "308192",
      "amazonAsin": "B0016KITZ6",
      "availability": "ok"
    },
    {
      "name": "Caltrate 600 Plus D3 (200 tablets)",
      "brand": "Caltrate",
      "form": "carbonate",
      "elementalMgPerServing": 600,
      "elementalMgPerUnit": 600,
      "servingSize": "1 tablet",
      "servingsPerContainer": 200,
      "vitaminD3IuPerServing": 800,
      "priceUsd": 16.78,
      "priceVerifiedOn": "2026-10-05",
      "costPer500MgUsd": 0.07,
      "certification": "None stated",
      "nihDsldId": "202225",
      "amazonAsin": "B0013TMWIK",
      "availability": "ok"
    },
    {
      "name": "Citracal Maximum Plus Calcium Citrate with Vitamin D3",
      "brand": "Citracal (Bayer)",
      "form": "citrate",
      "elementalMgPerServing": 650,
      "elementalMgPerUnit": 325,
      "servingSize": "2 caplets",
      "servingsPerContainer": 90,
      "vitaminD3IuPerServing": null,
      "priceUsd": 14.96,
      "priceVerifiedOn": "2026-10-05",
      "costPer500MgUsd": 0.128,
      "certification": "None",
      "nihDsldId": null,
      "amazonAsin": "B001LRPUMY",
      "availability": "ok"
    },
    {
      "name": "Citracal Petites Calcium Citrate with Vitamin D3",
      "brand": "Citracal (Bayer)",
      "form": "citrate",
      "elementalMgPerServing": 400,
      "elementalMgPerUnit": 200,
      "servingSize": "2 caplets",
      "servingsPerContainer": 100,
      "vitaminD3IuPerServing": null,
      "priceUsd": 10.92,
      "priceVerifiedOn": "2026-10-05",
      "costPer500MgUsd": 0.137,
      "certification": "None",
      "nihDsldId": null,
      "amazonAsin": "B0043ZLTT4",
      "availability": "ok"
    },
    {
      "name": "Solgar Calcium Citrate with Vitamin D3",
      "brand": "Solgar",
      "form": "citrate",
      "elementalMgPerServing": 1000,
      "elementalMgPerUnit": 250,
      "servingSize": "4 tablets",
      "servingsPerContainer": 60,
      "vitaminD3IuPerServing": null,
      "priceUsd": 20.85,
      "priceVerifiedOn": "2026-10-05",
      "costPer500MgUsd": 0.174,
      "certification": "None",
      "nihDsldId": null,
      "amazonAsin": "B00013YZ2U",
      "availability": "ok"
    },
    {
      "name": "NOW Foods Calcium Citrate with Minerals & Vitamin D",
      "brand": "NOW Foods",
      "form": "citrate",
      "elementalMgPerServing": 600,
      "elementalMgPerUnit": 300,
      "servingSize": "2 tablets",
      "servingsPerContainer": 125,
      "vitaminD3IuPerServing": null,
      "priceUsd": 26.49,
      "priceVerifiedOn": "2026-10-05",
      "costPer500MgUsd": 0.177,
      "certification": "None",
      "nihDsldId": null,
      "amazonAsin": "B0013OQJ66",
      "availability": "ok"
    }
  ]
}