{
  "name": "Magnesium Glycinate Label Census and Cost per 200 mg Elemental Magnesium",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "priceNote": "Every price and cost here is the brand list price (priceUsd = listPriceUsd), not an Amazon price; prices on Amazon differ. QA round 2, 2026-10-15.",
  "attribution": "Verified Supplement Data, https://verifiedsupplementdata.com/magnesium/cheapest-glycinate/",
  "dateModified": "2026-08-27",
  "methodology": "Labels sold as magnesium glycinate that list glycinate or bisglycinate on the Supplement Facts panel; the Magnesium row is elemental mg per serving; per unit = per serving / units per serving. Every figure was recomputed in two halves split by label-id parity; figures that did not agree within 8 points (shares) or 25% (medians) are not published.",
  "labelCensus": {
    "source": "NIH Dietary Supplement Label Database",
    "sourceUrl": "https://dsld.od.nih.gov/",
    "retrievedOn": "2026-08-27",
    "labelsRetrieved": 827,
    "labelsSoldAsMagnesium": 827,
    "labelsWithGlycinateOnPanel": 149,
    "labelsCounted": 149,
    "brands": 38,
    "labelsDeclaringAGlycinateForm": 149,
    "labelsNamedGlycinate": null,
    "oldKeysNote": "Kept for readers of the old keys (2026-10-15). Census keys set to null were retired when the site moved to one label set (labels with glycinate or bisglycinate on the panel); see the populated keys beside them.",
    "medianElementalMgPerServing": 250,
    "p75ElementalMgPerServing": 400,
    "medianElementalMgPerUnit": 111,
    "atLeast400MgPerServingPct": 32.9,
    "blendingAnotherMagnesiumFormPct": null,
    "validation": {
      "method": "split-half by DSLD label-id parity; shares within 8 points, medians within 25%",
      "checked": 10,
      "held": 8,
      "failed": [
        "share blending another magnesium form",
        "share blending magnesium oxide"
      ]
    },
    "notPublished": [
      "share blending another magnesium form",
      "share blending magnesium oxide"
    ]
  },
  "costPer200Mg": [
    {
      "name": "BulkSupplements Magnesium Glycinate Powder (500 g)",
      "brand": "BulkSupplements.com",
      "elementalMgPerServing": 300,
      "servingSize": "2.2 g powder (3/4 tsp)",
      "servingsPerContainer": 227,
      "priceUsd": 21.97,
      "listPriceUsd": 21.97,
      "priceBasis": "brand list price",
      "priceCheckedOn": "2026-10-14",
      "priceVerifiedOn": "2026-11-06",
      "amazonPriceUsd": 22.97,
      "costPer200MgUsd": 0.128,
      "certification": "NSF/ANSI 173 (glycinate + oxide blend)",
      "nihDsldId": null,
      "availability": "ok"
    },
    {
      "name": "Nutricost Magnesium Glycinate 210 mg (360 capsules)",
      "brand": "Nutricost",
      "elementalMgPerServing": 210,
      "servingSize": "3 capsules",
      "servingsPerContainer": 120,
      "priceUsd": 24.97,
      "listPriceUsd": 24.97,
      "priceBasis": "brand list price",
      "priceCheckedOn": "2026-10-14",
      "priceVerifiedOn": "2026-11-06",
      "amazonPriceUsd": 21.95,
      "costPer200MgUsd": 0.198,
      "certification": "None stated (third-party tested claim)",
      "nihDsldId": null,
      "availability": "ok"
    },
    {
      "name": "Doctor's Best High Absorption Magnesium",
      "brand": "Doctor's Best",
      "elementalMgPerServing": 200,
      "servingSize": "2 tablets",
      "servingsPerContainer": 120,
      "priceUsd": 23.99,
      "listPriceUsd": 23.99,
      "priceBasis": "brand list price",
      "priceCheckedOn": "2026-10-14",
      "priceVerifiedOn": "2026-11-06",
      "amazonPriceUsd": 23.99,
      "costPer200MgUsd": 0.2,
      "certification": "None",
      "nihDsldId": null,
      "availability": "ok"
    },
    {
      "name": "NOW Magnesium Bisglycinate Powder (8 oz)",
      "brand": "NOW Foods",
      "elementalMgPerServing": 250,
      "servingSize": "1 level teaspoon (~2.9 g)",
      "servingsPerContainer": 78,
      "priceUsd": 23.99,
      "listPriceUsd": 23.99,
      "priceBasis": "brand list price",
      "priceCheckedOn": "2026-10-14",
      "priceVerifiedOn": "2026-11-06",
      "amazonPriceUsd": 11.99,
      "costPer200MgUsd": 0.21,
      "certification": "NPA GMP Certified, Non-GMO Project Verified",
      "nihDsldId": null,
      "availability": "ok"
    },
    {
      "name": "NOW Magnesium Glycinate 200 mg (tablets)",
      "brand": "NOW Foods",
      "elementalMgPerServing": 200,
      "servingSize": "2 tablets",
      "servingsPerContainer": 120,
      "priceUsd": 31.99,
      "listPriceUsd": 31.99,
      "priceBasis": "brand list price",
      "priceCheckedOn": "2026-10-14",
      "priceVerifiedOn": "2026-11-06",
      "amazonPriceUsd": 26.12,
      "costPer200MgUsd": 0.355,
      "certification": "NPA GMP Certified",
      "nihDsldId": null,
      "availability": "ok"
    },
    {
      "name": "Thorne Magnesium Glycinate (90 capsules)",
      "brand": "Thorne",
      "elementalMgPerServing": 120,
      "servingSize": "1 capsule",
      "servingsPerContainer": 90,
      "priceUsd": 26,
      "listPriceUsd": 26,
      "priceBasis": "brand list price",
      "priceCheckedOn": "2026-10-14",
      "priceVerifiedOn": "2026-11-06",
      "amazonPriceUsd": 26,
      "costPer200MgUsd": 0.481,
      "certification": "NSF/ANSI 173",
      "nihDsldId": null,
      "availability": "ok"
    },
    {
      "name": "Nature Made Magnesium Glycinate 200mg",
      "brand": "Nature Made",
      "elementalMgPerServing": 200,
      "servingSize": "2 capsules",
      "servingsPerContainer": 30,
      "priceUsd": 21.99,
      "listPriceUsd": 21.99,
      "priceBasis": "brand list price",
      "priceCheckedOn": "2026-10-14",
      "priceVerifiedOn": "2026-11-06",
      "amazonPriceUsd": 11.7,
      "costPer200MgUsd": 0.733,
      "certification": "USP Verified",
      "nihDsldId": null,
      "availability": "ok"
    },
    {
      "name": "Vitamin Shoppe Magnesium Glycinate 400 mg (135 tablets)",
      "brand": "The Vitamin Shoppe",
      "elementalMgPerServing": 400,
      "servingSize": "3 tablets",
      "servingsPerContainer": 45,
      "priceUsd": null,
      "listPriceUsd": null,
      "priceBasis": "no list price we could check",
      "priceCheckedOn": "2026-10-14",
      "priceVerifiedOn": "2026-11-06",
      "amazonPriceUsd": 19.99,
      "costPer200MgUsd": null,
      "certification": "None",
      "nihDsldId": null,
      "availability": "ok"
    },
    {
      "name": "KAL Magnesium Glycinate 350 mg (240 VegCaps)",
      "brand": "KAL",
      "elementalMgPerServing": 350,
      "servingSize": "4 VegCaps",
      "servingsPerContainer": 60,
      "priceUsd": null,
      "listPriceUsd": null,
      "priceBasis": "no list price we could check",
      "priceCheckedOn": "2026-10-14",
      "priceVerifiedOn": "2026-11-06",
      "amazonPriceUsd": 24.79,
      "costPer200MgUsd": null,
      "certification": "None",
      "nihDsldId": null,
      "availability": "ok"
    },
    {
      "name": "Nature's Bounty High Absorption Magnesium Glycinate 240 mg (120 capsules)",
      "brand": "Nature's Bounty",
      "elementalMgPerServing": 240,
      "servingSize": "2 capsules",
      "servingsPerContainer": 60,
      "priceUsd": null,
      "listPriceUsd": null,
      "priceBasis": "no list price we could check",
      "priceCheckedOn": "2026-10-14",
      "priceVerifiedOn": "2026-11-06",
      "amazonPriceUsd": 15.97,
      "costPer200MgUsd": null,
      "certification": "None",
      "nihDsldId": null,
      "availability": "ok"
    }
  ]
}