{
  "name": "Iron Bisglycinate Label Census and Cost per Dose",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "attribution": "Verified Supplement Data, https://verifiedsupplementdata.com/iron/best-bisglycinate/",
  "methodology": "on-market labels sold as iron whose Supplement Facts iron row names a bisglycinate, Ferrochel or chelate form; the row is elemental mg per serving; per unit = per serving / units per serving; daily = per serving x maximum daily servings. Labels retrieved 2026-08-29. Upper limit 45 mg (NIH ODS); trial dose 25 mg (Milman 2014). Each finding recomputed in both halves of the DSLD read order (shares within 8 points, medians within 25%); findings listed under notPublished did not hold and are not printed on the page. Cost per dose = Amazon price / servings; month = 15 alternate-day doses. Pick rules: (1) one unit delivers 18-45 mg elemental iron, (2) USP Verified or NSF mark on the label, (3) lowest cost per dose.",
  "labelCensus": {
    "source": "NIH Dietary Supplement Label Database",
    "ironLabelsWithMgRow": 1587,
    "onMarketSoldAsIron": 560,
    "bisglycinateOrChelateLabels": 168,
    "pureBisglycinateLabels": 145,
    "brands": 96,
    "upperLimitMg": 45,
    "trialDoseMg": 25,
    "findings": {
      "n": 168,
      "median_elemental_per_serving_mg": 25,
      "p25_per_serving_mg": 15,
      "p75_per_serving_mg": 28,
      "median_elemental_per_unit_mg": 25,
      "median_daily_mg": 25,
      "at_most_25_per_serving_pct": 58.9,
      "at_least_18_per_serving_pct": 73.8,
      "over_45_daily_pct": 3.6,
      "blend_with_other_forms_pct": 13.7,
      "named_gentle_pct": 5.4,
      "capsule_or_tablet_pct": 85.7,
      "two_plus_units_per_serving_pct": 26.2
    },
    "heldInBothHalves": [
      "median elemental mg per serving",
      "p25 per serving",
      "p75 per serving",
      "median elemental mg per unit",
      "median directed daily mg",
      "share at least 18 mg per serving",
      "share directing more than 45 mg a day",
      "share blending another iron form",
      "share named gentle",
      "share capsule or tablet",
      "share needing 2+ units per serving"
    ],
    "notPublished": [
      "share at most 25 mg per serving"
    ]
  },
  "products": [
    {
      "name": "NOW Foods Iron 36 mg Double Strength (Ferrochel)",
      "brand": "NOW Foods",
      "elementalMgPerServing": 36,
      "servingSize": "1 capsule",
      "unitsPerServing": 1,
      "elementalMgPerUnit": 36,
      "servingsPerContainer": 90,
      "priceUsd": 9.55,
      "priceVerifiedOn": "2026-09-17",
      "costPerDoseUsd": 0.106,
      "costPerMonthAlternateDayUsd": 1.592,
      "costPerMgUsd": 0.003,
      "certification": "None",
      "productVerificationMark": false,
      "passesRule1_wholeDose18to45MgPerUnit": true,
      "amazonAsin": "B00FYOU6AG",
      "availability": "ok"
    },
    {
      "name": "Solgar Gentle Iron (Iron Bisglycinate) 25 mg",
      "brand": "Solgar",
      "elementalMgPerServing": 25,
      "servingSize": "1 capsule",
      "unitsPerServing": 1,
      "elementalMgPerUnit": 25,
      "servingsPerContainer": 90,
      "priceUsd": 12.95,
      "priceVerifiedOn": "2026-08-01",
      "costPerDoseUsd": 0.144,
      "costPerMonthAlternateDayUsd": 2.158,
      "costPerMgUsd": 0.006,
      "certification": "None",
      "productVerificationMark": false,
      "passesRule1_wholeDose18to45MgPerUnit": true,
      "amazonAsin": "B06XYVV5CW",
      "availability": "dead"
    },
    {
      "name": "Thorne Iron Bisglycinate 25 mg",
      "brand": "Thorne",
      "elementalMgPerServing": 25,
      "servingSize": "1 capsule",
      "unitsPerServing": 1,
      "elementalMgPerUnit": 25,
      "servingsPerContainer": 60,
      "priceUsd": 16,
      "priceVerifiedOn": "2026-09-17",
      "costPerDoseUsd": 0.267,
      "costPerMonthAlternateDayUsd": 4,
      "costPerMgUsd": 0.011,
      "certification": "NSF Certified for Sport",
      "productVerificationMark": true,
      "passesRule1_wholeDose18to45MgPerUnit": true,
      "amazonAsin": "B0797GZDZL",
      "availability": "ok"
    },
    {
      "name": "MegaFood Blood Builder",
      "brand": "MegaFood",
      "elementalMgPerServing": 26,
      "servingSize": "1 tablet",
      "unitsPerServing": 1,
      "elementalMgPerUnit": 26,
      "servingsPerContainer": 90,
      "priceUsd": 28.99,
      "priceVerifiedOn": "2026-09-17",
      "costPerDoseUsd": 0.322,
      "costPerMonthAlternateDayUsd": 4.832,
      "costPerMgUsd": 0.012,
      "certification": "NSF Certified",
      "productVerificationMark": true,
      "passesRule1_wholeDose18to45MgPerUnit": true,
      "amazonAsin": "B000F4ZRCC",
      "availability": "ok"
    }
  ]
}