{
  "name": "Magnesium Glycinate Label Census and Cost per 200 mg",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "attribution": "Verified Supplement Data, https://verifiedsupplementdata.com/magnesium/best-glycinate/",
  "methodology": "labels sold as magnesium whose product name says glycinate or bisglycinate; Supplement Facts magnesium row is elemental mg per serving; per unit = per serving / units per serving. Labels retrieved 2026-08-27. 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 200 mg = Amazon price / (elemental mg per serving x servings) x 200. Pick rules: (1) at least 100 mg elemental per capsule, (2) USP Verified or NSF mark on the label, (3) lowest cost per 200 mg.",
  "labelCensus": {
    "source": "NIH Dietary Supplement Label Database",
    "magnesiumLabelsRetrieved": 827,
    "glycinateFormLabels": 149,
    "labelsNamedGlycinate": 57,
    "brands": 38,
    "populations": {
      "anyGlycinateForm": {
        "findings": {
          "n": 149,
          "median_elemental_per_serving_mg": 250,
          "p25_per_serving_mg": 200,
          "p75_per_serving_mg": 400,
          "median_elemental_per_unit_mg": 111,
          "at_least_400_per_serving_pct": 32.9,
          "at_least_200_per_serving_pct": 78.5,
          "below_120_per_serving_pct": 10.1,
          "blend_with_other_forms_pct": 56.4,
          "blend_with_oxide_pct": 18.8,
          "two_plus_units_per_serving_pct": 78.5,
          "units_for_400_mg_median": 3.6
        },
        "heldInBothHalves": [
          "median elemental mg per serving",
          "p25 per serving",
          "p75 per serving",
          "median elemental mg per capsule or tablet",
          "share at least 400 mg per serving",
          "share at least 200 mg per serving",
          "share below 120 mg per serving",
          "share needing 2+ units per serving"
        ],
        "notPublished": [
          "share blending another magnesium form",
          "share blending magnesium oxide"
        ]
      },
      "namedGlycinate": {
        "findings": {
          "n": 57,
          "median_elemental_per_serving_mg": 220,
          "p25_per_serving_mg": 125,
          "p75_per_serving_mg": 400,
          "median_elemental_per_unit_mg": 100,
          "at_least_400_per_serving_pct": 36.8,
          "at_least_200_per_serving_pct": 70.2,
          "below_120_per_serving_pct": 15.8,
          "blend_with_other_forms_pct": 19.3,
          "blend_with_oxide_pct": 7,
          "two_plus_units_per_serving_pct": 77.2,
          "units_for_400_mg_median": 4
        },
        "heldInBothHalves": [
          "median elemental mg per serving",
          "p75 per serving",
          "median elemental mg per capsule or tablet",
          "share at least 400 mg per serving",
          "share blending another magnesium form"
        ],
        "notPublished": [
          "p25 per serving",
          "share at least 200 mg per serving",
          "share below 120 mg per serving",
          "share blending magnesium oxide",
          "share needing 2+ units per serving"
        ]
      }
    },
    "note": "The page prints a finding only from a population in which it held in both halves; notPublished lists the ones that did not."
  },
  "products": [
    {
      "name": "BulkSupplements Magnesium Glycinate Powder",
      "brand": "BulkSupplements.com",
      "elementalMgPerServing": 225,
      "servingSize": "1250 mg powder (~1/2 tsp)",
      "unitsPerServing": null,
      "elementalMgPerUnit": null,
      "unitsFor400Mg": null,
      "servingsPerContainer": 200,
      "priceUsd": 19.97,
      "priceVerifiedOn": "2026-09-17",
      "costPer200MgUsd": 0.089,
      "certification": "None",
      "productVerificationMark": false,
      "passesRule1_atLeast100MgPerUnit": null,
      "nihDsldId": "310750",
      "amazonAsin": "B00F7OZJQE",
      "availability": "ok"
    },
    {
      "name": "Vitamin Shoppe Magnesium Glycinate 400mg",
      "brand": "The Vitamin Shoppe",
      "elementalMgPerServing": 400,
      "servingSize": "2 tablets",
      "unitsPerServing": 2,
      "elementalMgPerUnit": 200,
      "unitsFor400Mg": 2,
      "servingsPerContainer": 90,
      "priceUsd": 19.99,
      "priceVerifiedOn": "2026-09-17",
      "costPer200MgUsd": 0.111,
      "certification": "None",
      "productVerificationMark": false,
      "passesRule1_atLeast100MgPerUnit": true,
      "nihDsldId": "208724",
      "amazonAsin": "B0DZLYHSVN",
      "availability": "ok"
    },
    {
      "name": "NOW Magnesium Bisglycinate Powder (8 oz)",
      "brand": "NOW Foods",
      "elementalMgPerServing": 250,
      "servingSize": "1 level teaspoon (~2.9 g)",
      "unitsPerServing": null,
      "elementalMgPerUnit": null,
      "unitsFor400Mg": null,
      "servingsPerContainer": 78,
      "priceUsd": 14.69,
      "priceVerifiedOn": "2026-09-18",
      "costPer200MgUsd": 0.151,
      "certification": "NPA GMP Certified, Non-GMO Project Verified",
      "productVerificationMark": false,
      "passesRule1_atLeast100MgPerUnit": null,
      "nihDsldId": null,
      "amazonAsin": "B00NIJ03C0",
      "availability": "ok"
    },
    {
      "name": "Nutricost Magnesium Glycinate 210 mg (360 capsules)",
      "brand": "Nutricost",
      "elementalMgPerServing": 210,
      "servingSize": "3 capsules",
      "unitsPerServing": 3,
      "elementalMgPerUnit": 70,
      "unitsFor400Mg": 6,
      "servingsPerContainer": 120,
      "priceUsd": 21.95,
      "priceVerifiedOn": "2026-09-18",
      "costPer200MgUsd": 0.174,
      "certification": "None stated (third-party tested claim)",
      "productVerificationMark": false,
      "passesRule1_atLeast100MgPerUnit": false,
      "nihDsldId": null,
      "amazonAsin": "B0CV2SXX5M",
      "availability": "ok"
    },
    {
      "name": "Nature Made Magnesium Glycinate 200mg",
      "brand": "Nature Made",
      "elementalMgPerServing": 200,
      "servingSize": "1 capsule",
      "unitsPerServing": 1,
      "elementalMgPerUnit": 200,
      "unitsFor400Mg": 2,
      "servingsPerContainer": 60,
      "priceUsd": 11.7,
      "priceVerifiedOn": "2026-09-17",
      "costPer200MgUsd": 0.195,
      "certification": "USP Verified",
      "productVerificationMark": true,
      "passesRule1_atLeast100MgPerUnit": true,
      "nihDsldId": null,
      "amazonAsin": "B08XXHCGZT",
      "availability": "ok"
    },
    {
      "name": "NOW Magnesium Glycinate 200 mg (240 tablets)",
      "brand": "NOW Foods",
      "elementalMgPerServing": 200,
      "servingSize": "2 tablets",
      "unitsPerServing": 2,
      "elementalMgPerUnit": 100,
      "unitsFor400Mg": 4,
      "servingsPerContainer": 120,
      "priceUsd": 26.12,
      "priceVerifiedOn": "2026-09-18",
      "costPer200MgUsd": 0.218,
      "certification": "NPA GMP Certified",
      "productVerificationMark": false,
      "passesRule1_atLeast100MgPerUnit": true,
      "nihDsldId": null,
      "amazonAsin": "B0CB984SHQ",
      "availability": "ok"
    },
    {
      "name": "Doctor's Best High Absorption Magnesium",
      "brand": "Doctor's Best",
      "elementalMgPerServing": 200,
      "servingSize": "2 tablets",
      "unitsPerServing": 2,
      "elementalMgPerUnit": 100,
      "unitsFor400Mg": 4,
      "servingsPerContainer": 60,
      "priceUsd": 13.99,
      "priceVerifiedOn": "2026-09-17",
      "costPer200MgUsd": 0.233,
      "certification": "None",
      "productVerificationMark": false,
      "passesRule1_atLeast100MgPerUnit": true,
      "nihDsldId": null,
      "amazonAsin": "B00151G8L8",
      "availability": "ok"
    },
    {
      "name": "Nature's Bounty High Absorption Magnesium Glycinate 240 mg (120 capsules)",
      "brand": "Nature's Bounty",
      "elementalMgPerServing": 240,
      "servingSize": "2 capsules",
      "unitsPerServing": 2,
      "elementalMgPerUnit": 120,
      "unitsFor400Mg": 4,
      "servingsPerContainer": 60,
      "priceUsd": 17.29,
      "priceVerifiedOn": "2026-09-18",
      "costPer200MgUsd": 0.24,
      "certification": "None",
      "productVerificationMark": false,
      "passesRule1_atLeast100MgPerUnit": true,
      "nihDsldId": null,
      "amazonAsin": "B0DT1JKGPH",
      "availability": "ok"
    },
    {
      "name": "KAL Magnesium Glycinate 400",
      "brand": "KAL",
      "elementalMgPerServing": 400,
      "servingSize": "2 tablets",
      "unitsPerServing": 2,
      "elementalMgPerUnit": 200,
      "unitsFor400Mg": 2,
      "servingsPerContainer": 45,
      "priceUsd": 24.79,
      "priceVerifiedOn": "2026-09-17",
      "costPer200MgUsd": 0.275,
      "certification": "None",
      "productVerificationMark": false,
      "passesRule1_atLeast100MgPerUnit": true,
      "nihDsldId": "253226",
      "amazonAsin": "B09K4H6H96",
      "availability": "ok"
    },
    {
      "name": "Thorne Magnesium Bisglycinate",
      "brand": "Thorne",
      "elementalMgPerServing": 200,
      "servingSize": "1 capsule",
      "unitsPerServing": 1,
      "elementalMgPerUnit": 200,
      "unitsFor400Mg": 2,
      "servingsPerContainer": 60,
      "priceUsd": 26,
      "priceVerifiedOn": "2026-09-17",
      "costPer200MgUsd": 0.433,
      "certification": "NSF Certified for Sport",
      "productVerificationMark": true,
      "passesRule1_atLeast100MgPerUnit": true,
      "nihDsldId": null,
      "amazonAsin": "B0F5XYHRPV",
      "availability": "ok"
    }
  ]
}