{
  "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/",
  "dateModified": "2026-10-14",
  "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 = brand list price / (magnesium mg per serving x servings) x 200. Testing lists searched 2026-10-14. The pick is the top score among glycinates on a public testing list (testing, dose, cost, label, recalls).",
  "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": [
    {
      "slug": "nutricost-magnesium-glycinate-360",
      "name": "Nutricost Magnesium Glycinate 210 mg",
      "magnesiumMgPerServing": 210,
      "servingSize": "3 capsules",
      "unitsPerServing": 3,
      "magnesiumMgPerUnit": 70,
      "listPriceUsd": 24.97,
      "servingsPerContainer": 120,
      "costPer200MgUsd": 0.198,
      "score": 8.5,
      "testingLists": [],
      "priceSeller": "nutricost.com",
      "priceCheckedOn": "2026-10-14",
      "brand": "Nutricost",
      "elementalMgPerServing": 210,
      "elementalMgPerUnit": 70,
      "unitsFor400Mg": 6,
      "priceUsd": 21.95,
      "priceVerifiedOn": "2026-11-06",
      "certification": "None stated (third-party tested claim)",
      "productVerificationMark": false,
      "passesRule1_atLeast100MgPerUnit": false,
      "nihDsldId": null,
      "amazonAsin": "B0CV2SXX5M",
      "availability": "ok"
    },
    {
      "slug": "doctors-best-magnesium",
      "name": "Doctor's Best High Absorption Magnesium",
      "magnesiumMgPerServing": 200,
      "servingSize": "2 tablets",
      "unitsPerServing": 2,
      "magnesiumMgPerUnit": 100,
      "listPriceUsd": 23.99,
      "servingsPerContainer": 120,
      "costPer200MgUsd": 0.2,
      "score": 7,
      "testingLists": [],
      "priceSeller": "doctorsbest.com",
      "priceCheckedOn": "2026-10-14",
      "brand": "Doctor's Best",
      "elementalMgPerServing": 200,
      "elementalMgPerUnit": 100,
      "unitsFor400Mg": 4,
      "priceUsd": 23.99,
      "priceVerifiedOn": "2026-11-06",
      "certification": "None",
      "productVerificationMark": false,
      "passesRule1_atLeast100MgPerUnit": true,
      "nihDsldId": null,
      "amazonAsin": "B000BD0RT0",
      "availability": "ok"
    },
    {
      "slug": "now-magnesium-bisglycinate-powder",
      "name": "NOW Magnesium Bisglycinate Powder",
      "magnesiumMgPerServing": 300,
      "servingSize": "1 level teaspoon",
      "unitsPerServing": null,
      "magnesiumMgPerUnit": null,
      "listPriceUsd": 23.99,
      "servingsPerContainer": 76,
      "costPer200MgUsd": 0.21,
      "score": 7,
      "testingLists": [],
      "priceSeller": "nowfoods.com",
      "priceCheckedOn": "2026-10-14",
      "brand": "NOW Foods",
      "elementalMgPerServing": 300,
      "elementalMgPerUnit": null,
      "unitsFor400Mg": null,
      "priceUsd": 11.99,
      "priceVerifiedOn": "2026-11-06",
      "certification": "NPA GMP Certified, Non-GMO Project Verified",
      "productVerificationMark": false,
      "passesRule1_atLeast100MgPerUnit": null,
      "nihDsldId": null,
      "amazonAsin": "B00NIJ03C0",
      "availability": "ok"
    },
    {
      "slug": "now-magnesium-glycinate-240-tabs",
      "name": "NOW Magnesium Glycinate 200 mg",
      "magnesiumMgPerServing": 200,
      "servingSize": "2 tablets",
      "unitsPerServing": 2,
      "magnesiumMgPerUnit": 100,
      "listPriceUsd": 31.99,
      "servingsPerContainer": 90,
      "costPer200MgUsd": 0.355,
      "score": 6,
      "testingLists": [],
      "priceSeller": "nowfoods.com",
      "priceCheckedOn": "2026-10-14",
      "brand": "NOW Foods",
      "elementalMgPerServing": 200,
      "elementalMgPerUnit": 100,
      "unitsFor400Mg": 4,
      "priceUsd": 26.12,
      "priceVerifiedOn": "2026-11-06",
      "certification": "NPA GMP Certified",
      "productVerificationMark": false,
      "passesRule1_atLeast100MgPerUnit": true,
      "nihDsldId": null,
      "amazonAsin": "B0CB984SHQ",
      "availability": "ok"
    },
    {
      "slug": "thorne-magnesium-bisglycinate",
      "name": "Thorne Magnesium Glycinate",
      "magnesiumMgPerServing": 120,
      "servingSize": "1 capsule (label allows 1 to 4 a day)",
      "unitsPerServing": 1,
      "magnesiumMgPerUnit": 120,
      "listPriceUsd": 26,
      "servingsPerContainer": 90,
      "costPer200MgUsd": 0.481,
      "score": 6.5,
      "testingLists": [
        "NSF/ANSI 173"
      ],
      "priceSeller": "thorne.com",
      "priceCheckedOn": "2026-10-14",
      "brand": "Thorne",
      "elementalMgPerServing": 120,
      "elementalMgPerUnit": 120,
      "unitsFor400Mg": 4,
      "priceUsd": 26,
      "priceVerifiedOn": "2026-11-06",
      "certification": "NSF/ANSI 173",
      "productVerificationMark": true,
      "passesRule1_atLeast100MgPerUnit": true,
      "nihDsldId": null,
      "amazonAsin": "B0F5XYHRPV",
      "availability": "ok"
    },
    {
      "slug": "nature-made-magnesium-glycinate",
      "name": "Nature Made Magnesium Glycinate 200mg",
      "magnesiumMgPerServing": 200,
      "servingSize": "2 capsules",
      "unitsPerServing": 2,
      "magnesiumMgPerUnit": 100,
      "listPriceUsd": 21.99,
      "servingsPerContainer": 30,
      "costPer200MgUsd": 0.733,
      "score": 8,
      "testingLists": [
        "USP Verified"
      ],
      "priceSeller": "naturemade.com",
      "priceCheckedOn": "2026-10-14",
      "brand": "Nature Made",
      "elementalMgPerServing": 200,
      "elementalMgPerUnit": 100,
      "unitsFor400Mg": 4,
      "priceUsd": 11.7,
      "priceVerifiedOn": "2026-11-06",
      "certification": "USP Verified",
      "productVerificationMark": true,
      "passesRule1_atLeast100MgPerUnit": true,
      "nihDsldId": null,
      "amazonAsin": "B08XXHCGZT",
      "availability": "ok"
    },
    {
      "slug": "bulksupplements-magnesium-glycinate",
      "name": "BulkSupplements Magnesium Glycinate Powder",
      "magnesiumMgPerServing": 300,
      "servingSize": "¾ teaspoon (2.2 g)",
      "unitsPerServing": null,
      "listPriceUsd": 21.97,
      "servingsPerContainer": 114,
      "costPer200MgUsd": 0.128,
      "score": null,
      "notScoredBecause": "Its label says the magnesium comes from glycinate and oxide together, so it is a blend, not pure glycinate.",
      "brand": "BulkSupplements.com",
      "elementalMgPerServing": 300,
      "elementalMgPerUnit": null,
      "unitsFor400Mg": null,
      "priceUsd": 22.97,
      "priceVerifiedOn": "2026-11-06",
      "certification": "NSF/ANSI 173 (glycinate + oxide blend)",
      "productVerificationMark": true,
      "passesRule1_atLeast100MgPerUnit": null,
      "nihDsldId": null,
      "amazonAsin": "B00F7OZJQ4",
      "availability": "ok"
    },
    {
      "slug": "kal-magnesium-glycinate-400",
      "name": "KAL Magnesium Glycinate 350",
      "magnesiumMgPerServing": 350,
      "servingSize": "4 capsules",
      "unitsPerServing": 4,
      "listPriceUsd": null,
      "servingsPerContainer": 60,
      "costPer200MgUsd": null,
      "score": null,
      "notScoredBecause": "KAL’s own store sells only a smaller bottle, so we have no list price for this one.",
      "brand": "KAL",
      "elementalMgPerServing": 350,
      "elementalMgPerUnit": 88,
      "unitsFor400Mg": 5,
      "priceUsd": 24.79,
      "priceVerifiedOn": "2026-11-06",
      "certification": "None",
      "productVerificationMark": false,
      "passesRule1_atLeast100MgPerUnit": false,
      "nihDsldId": null,
      "amazonAsin": "B09K4H6H96",
      "availability": "ok"
    },
    {
      "slug": "natures-bounty-magnesium-glycinate-240",
      "name": "Nature’s Bounty Magnesium Glycinate 240 mg",
      "magnesiumMgPerServing": 240,
      "servingSize": "2 capsules",
      "unitsPerServing": 2,
      "listPriceUsd": null,
      "servingsPerContainer": 60,
      "costPer200MgUsd": null,
      "score": null,
      "notScoredBecause": "Nature’s Bounty sells nothing on its own site, so we have no list price.",
      "brand": "Nature's Bounty",
      "elementalMgPerServing": 240,
      "elementalMgPerUnit": 120,
      "unitsFor400Mg": 4,
      "priceUsd": 15.97,
      "priceVerifiedOn": "2026-11-06",
      "certification": "None",
      "productVerificationMark": false,
      "passesRule1_atLeast100MgPerUnit": true,
      "nihDsldId": null,
      "amazonAsin": "B0DT1JKGPH",
      "availability": "ok"
    }
  ]
}