{
  "name": "Vitamin B12 1,000 mcg: Shelf Census and Cost per Dose",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "attribution": "Verified Supplement Data, https://verifiedsupplementdata.com/b12/1000-mcg/",
  "dateModified": "2026-09-21",
  "methodology": "Supplement Facts panel, products whose own name is the B12 product. Every finding was recomputed in both halves of the read order; only findings that held are exported. 670 labels where B12 is one ingredient of a multivitamin or B-complex are excluded: pooling them with standalone B12 fails split-half validation (median 500 mcg vs 30 mcg by read order) because they are a different product category, not a different sample of the same one.",
  "absorption": {
    "intrinsicFactorSaturationMcgPerDose": 1.5,
    "passiveDiffusionPct": 1,
    "absorbedFrom1000McgApprox": 11.5,
    "rdaMcg": 2.4,
    "source": "Carmel 2008, PMID 18606874; Kuzminski 1998, PMID 9694707; Eussen 2005, PMID 15911731"
  },
  "labelCensus": {
    "source": "NIH Dietary Supplement Label Database",
    "labelsOnMarket": 14384,
    "labelsRead": 881,
    "standaloneB12Products": 211,
    "withDose": 203,
    "medianMcgPerServing": 1000,
    "exactly1000McgPct": 33.5,
    "atOrAbove1000McgPct": 63.1,
    "atOrAbove5000McgPct": 13.3,
    "atOrBelowRdaPct": 0.5,
    "bands": [
      {
        "band": "under 100 mcg",
        "n": 3,
        "pct": 1.5
      },
      {
        "band": "100-999 mcg",
        "n": 72,
        "pct": 35.5
      },
      {
        "band": "exactly 1,000 mcg",
        "n": 68,
        "pct": 33.5
      },
      {
        "band": "1,001-4,999 mcg",
        "n": 33,
        "pct": 16.3
      },
      {
        "band": "5,000 mcg or more",
        "n": 27,
        "pct": 13.3
      }
    ],
    "validation": {
      "method": "split-half by read order",
      "checked": 5,
      "held": 5,
      "failed": []
    },
    "descriptiveChemicalForms": {
      "note": "descriptive counts from the wider 881-label read, not validated findings",
      "forms": [
        {
          "form": "Methylcobalamin",
          "labels": 362
        },
        {
          "form": "Cyanocobalamin",
          "labels": 302
        },
        {
          "form": "Adenosylcobalamin",
          "labels": 67
        },
        {
          "form": "Cobalamin",
          "labels": 46
        },
        {
          "form": "Hydroxocobalamin",
          "labels": 32
        },
        {
          "form": "Vitamin B12",
          "labels": 28
        },
        {
          "form": "Dibencozide",
          "labels": 27
        },
        {
          "form": "Hydroxycobalamin",
          "labels": 15
        },
        {
          "form": "Cobamamide",
          "labels": 8
        },
        {
          "form": "Saccharomyces cerevisae",
          "labels": 4
        }
      ]
    }
  },
  "costPerDose": [
    {
      "name": "Vitamatic Vitamin B12 1000 mcg Fast Dissolve (365 tablets)",
      "brand": "Vitamatic",
      "mcgPerServing": 1000,
      "chemicalForm": "cyanocobalamin",
      "servingSize": "1 tablet",
      "servingsPerContainer": 365,
      "priceUsd": 8.99,
      "priceVerifiedOn": "2026-09-21",
      "costPerDoseUsd": 0.025,
      "dissolvesInMouth": true,
      "certification": "None stated (GMP claim)",
      "nihDsldId": null,
      "availability": "ok"
    },
    {
      "name": "Nature's Bounty Vitamin B12 1000 mcg Caplets (200 tablets)",
      "brand": "Nature's Bounty",
      "mcgPerServing": 1000,
      "chemicalForm": "cyanocobalamin",
      "servingSize": "1 coated tablet",
      "servingsPerContainer": 200,
      "priceUsd": 9.97,
      "priceVerifiedOn": "2026-09-21",
      "costPerDoseUsd": 0.05,
      "dissolvesInMouth": false,
      "certification": "None",
      "nihDsldId": "72985",
      "availability": "ok"
    },
    {
      "name": "Nutricost Vitamin B12 Methylcobalamin 1000 mcg (240 capsules)",
      "brand": "Nutricost",
      "mcgPerServing": 1000,
      "chemicalForm": "methylcobalamin",
      "servingSize": "1 capsule",
      "servingsPerContainer": 240,
      "priceUsd": 13.95,
      "priceVerifiedOn": "2026-09-21",
      "costPerDoseUsd": 0.058,
      "dissolvesInMouth": false,
      "certification": "None stated (third-party tested claim)",
      "nihDsldId": null,
      "availability": "ok"
    },
    {
      "name": "Nature Made Vitamin B12 1000 mcg Time Release (160 tablets)",
      "brand": "Nature Made",
      "mcgPerServing": 1000,
      "chemicalForm": "cyanocobalamin",
      "servingSize": "1 tablet",
      "servingsPerContainer": 160,
      "priceUsd": 10.65,
      "priceVerifiedOn": "2026-09-21",
      "costPerDoseUsd": 0.067,
      "dissolvesInMouth": false,
      "certification": "None stated",
      "nihDsldId": "271534",
      "availability": "ok"
    },
    {
      "name": "Nature Made Vitamin B12 1000 mcg Sublingual Fast Dissolve",
      "brand": "Nature Made",
      "mcgPerServing": 1000,
      "chemicalForm": "not stated",
      "servingSize": "1 fast dissolve tablet",
      "servingsPerContainer": 150,
      "priceUsd": 16.85,
      "priceVerifiedOn": "2026-09-20",
      "costPerDoseUsd": 0.112,
      "dissolvesInMouth": true,
      "certification": "USP Verified",
      "nihDsldId": null,
      "availability": "ok"
    },
    {
      "name": "NatureWise Vitamin B12 1000 mcg (60 softgels)",
      "brand": "NatureWise",
      "mcgPerServing": 1000,
      "chemicalForm": "not stated",
      "servingSize": "1 softgel",
      "servingsPerContainer": 60,
      "priceUsd": 6.99,
      "priceVerifiedOn": "2026-09-21",
      "costPerDoseUsd": 0.117,
      "dissolvesInMouth": false,
      "certification": "NSF Contents Certified",
      "nihDsldId": null,
      "availability": "ok"
    },
    {
      "name": "Jarrow Formulas Methyl B-12 1000 mcg Lemon",
      "brand": "Jarrow Formulas",
      "mcgPerServing": 1000,
      "chemicalForm": "methylcobalamin",
      "servingSize": "1 chewable tablet",
      "servingsPerContainer": 100,
      "priceUsd": 11.92,
      "priceVerifiedOn": "2026-09-20",
      "costPerDoseUsd": 0.119,
      "dissolvesInMouth": true,
      "certification": "None",
      "nihDsldId": null,
      "availability": "ok"
    },
    {
      "name": "Thorne Vitamin B12 as Methylcobalamin 1 mg",
      "brand": "Thorne",
      "mcgPerServing": 1000,
      "chemicalForm": "methylcobalamin",
      "servingSize": "1 capsule",
      "servingsPerContainer": 60,
      "priceUsd": 24,
      "priceVerifiedOn": "2026-09-20",
      "costPerDoseUsd": 0.4,
      "dissolvesInMouth": false,
      "certification": "NSF Certified for Sport",
      "nihDsldId": null,
      "availability": "ok"
    }
  ]
}