{
  "dataset": "glucomannan-cost-by-brand",
  "title": "Glucomannan Supplements Compared — cost per gram, form, and cost to hit the EFSA 3g/day weight-loss dose",
  "sourcePage": "https://verifiedsupplementdata.com/glucomannan/best-overall/",
  "license": "CC-BY-4.0",
  "licenseUrl": "https://creativecommons.org/licenses/by/4.0/",
  "attribution": "Verified Supplement Data (2026), Glucomannan Cost Comparison",
  "dateModified": "2026-07-19",
  "methodology": "All 5 verified products disclose glucomannan mg per serving directly on the label (unlike psyllium's soluble-fiber disclosure gap) — costPerGram = price / (servings x grams glucomannan per serving). costPerEfsaDose projects the cost of reaching the EFSA/EU-authorized weight-loss claim dose (Regulation (EU) No 432/2012: 3g/day glucomannan, three 1g doses with 1-2 glasses of water before meals, in the context of an energy-restricted diet). For powder, costPerEfsaDose = costPerGram x 3; for capsules, it uses the NEAREST realistic capsule count to 3g (capsules cannot be dosed continuously) x the per-capsule price — capsules cost meaningfully more per effective gram than powder in every product checked here. Separate EU claim: glucomannan contributes to normal blood cholesterol maintenance at 4g/day. Dedicated constipation-RCT dose: 4.5g/day (Chen 2006, n=8, the only dedicated glucomannan constipation trial found). SAFETY: glucomannan is a highly viscous, hygroscopic fiber with documented case reports of esophageal obstruction from a swelling bezoar (Vanderbeek 2007, PMID 17357389; Henry 1986, PMID 3004635) — take every dose with at least 8 fl oz (a full glass) of water, never dry, and never as an underhydrated tablet. Separate from oral medications by roughly 1-2 hours. This statement has not been evaluated by the FDA; these products are not intended to diagnose, treat, cure, or prevent any disease.",
  "headline": {
    "productsCompared": 5,
    "efsaClaimDoseG": 3,
    "cheapestPerGram": 0.0499,
    "cheapestPerGramBrand": "Nutricost",
    "priciestPerGramBrand": "Nature's Way",
    "priceRatio": 3.77,
    "cheapestEfsaDoseCost": 0.15,
    "cheapestEfsaDoseBrand": "Nutricost",
    "note": "Powder (Nutricost) is the cheapest cost per gram of glucomannan and lets you dose exactly to 3g. Capsules cost meaningfully more per effective gram because of real pill-burden math (~5 capsules needed to approximate a 3g dose) — you are trading cost for convenience, not getting more glucomannan."
  },
  "columns": [
    "brand",
    "product",
    "slug",
    "form",
    "gramsPerServing",
    "servingsPerContainer",
    "price",
    "costPerServing",
    "costPerGram",
    "capsulesForEfsaDose",
    "costPerEfsaDose"
  ],
  "units": {
    "gramsPerServing": "g glucomannan per serving",
    "price": "USD",
    "costPerServing": "USD/serving",
    "costPerGram": "USD per gram of glucomannan",
    "costPerEfsaDose": "USD to reach the 3g/day EFSA weight-loss claim dose"
  },
  "citations": [
    {
      "claim": "EFSA/EU weight-loss claim (Regulation (EU) No 432/2012): glucomannan contributes to weight loss in the context of an energy-restricted diet, at 3g/day (three 1g doses with 1-2 glasses of water before meals).",
      "source": "EFSA NDA Panel scientific opinion / Regulation (EU) No 432/2012",
      "pmid": null
    },
    {
      "claim": "Double-blind RCT, n=53, 8 weeks, 1.33g glucomannan (~4g/day total) with 8oz water before meals vs placebo: \"no significant difference between the glucomannan and placebo groups in amount of weight loss (-.40 +/- .06 and -.43 +/- .07, resp.).\"",
      "source": "Keithley JK, Swanson B, et al. 2013, Journal of Obesity",
      "pmid": "24490058"
    },
    {
      "claim": "Meta-analysis of 8 RCTs: \"nonstatistically significant difference in weight loss between glucomannan and placebo (mean difference: -0.22 kg; 95% CI, -0.62, 0.19).\"",
      "source": "Onakpoya I, Posadzki P, Ernst E 2014, Journal of the American College of Nutrition",
      "pmid": "24533610"
    },
    {
      "claim": "Meta-analysis of 14 studies, n=531: LDL cholesterol weighted mean difference -15.99 mg/dL.",
      "source": "Sood N, Baker WL, Coleman CI 2008, American Journal of Clinical Nutrition",
      "pmid": "18842808"
    },
    {
      "claim": "Crossover RCT, n=22 T2D patients, 3.6g/day konjac glucomannan, 28 days: LDL cholesterol -20.7% (p=0.0004) vs placebo.",
      "source": "Chen HL, Sheu WH, et al. 2003, Journal of the American College of Nutrition",
      "pmid": "12569112"
    },
    {
      "claim": "Case report: esophageal obstruction from a hygroscopic pharmacobezoar containing glucomannan.",
      "source": "Vanderbeek PB, Fasano C, et al. 2007, Clinical Toxicology",
      "pmid": "17357389"
    }
  ],
  "products": [
    {
      "brand": "Nutricost",
      "product": "Glucomannan Powder (500g)",
      "slug": "nutricost-glucomannan-powder-500g",
      "form": "Powder",
      "gramsPerServing": 2,
      "servingsPerContainer": 250,
      "price": 24.95,
      "costPerServing": 0.1,
      "costPerGram": 0.0499,
      "capsulesForEfsaDose": null,
      "costPerEfsaDose": 0.15,
      "note": "100% konjac glucomannan powder — 2g per 2g scoop, dosed exactly to the 3g EFSA weight-loss protocol (1.5 scoops) or the ~4g EU cholesterol dose (2 scoops). Cheapest cost per gram of the 5 products verified."
    },
    {
      "brand": "BulkSupplements.com",
      "product": "Glucomannan Powder from Konjac Root (500g)",
      "slug": "bulksupplements-glucomannan-powder-500g",
      "form": "Powder",
      "gramsPerServing": 2,
      "servingsPerContainer": 250,
      "price": 40.97,
      "costPerServing": 0.16,
      "costPerGram": 0.0819,
      "capsulesForEfsaDose": null,
      "costPerEfsaDose": 0.25,
      "note": "100% konjac-root glucomannan powder, no additives. About 1.6x Nutricost powder's cost per gram — a clean-label alternative in the same pure-powder format."
    },
    {
      "brand": "Nutricost",
      "product": "Glucomannan 1,800mg per Serving (180 Capsules)",
      "slug": "nutricost-glucomannan-1800mg-capsules",
      "form": "Capsule",
      "gramsPerServing": 0.6,
      "servingsPerContainer": 180,
      "price": 16.95,
      "costPerServing": 0.09,
      "costPerGram": 0.1569,
      "capsulesForEfsaDose": 5,
      "costPerEfsaDose": 0.47,
      "note": "600mg glucomannan per capsule (label serving = 3 capsules / 1,800mg) — divides evenly into the 3g EFSA dose at exactly 5 capsules, the cleanest capsule dose math of the two capsule products verified. Take with a full glass of water, never dry."
    },
    {
      "brand": "NOW Foods",
      "product": "Glucomannan 575mg (180 Veg Capsules)",
      "slug": "now-foods-glucomannan-575mg",
      "form": "Capsule",
      "gramsPerServing": 0.575,
      "servingsPerContainer": 180,
      "price": 16.52,
      "costPerServing": 0.09,
      "costPerGram": 0.1596,
      "capsulesForEfsaDose": 5,
      "costPerEfsaDose": 0.46,
      "note": "575mg glucomannan (Amorphophallus konjac) per capsule — cheapest capsule sticker price of the two capsule formats verified; needs about 5 capsules (2.875g) to approximate the 3g EFSA dose. Take every capsule with a full glass of water, never dry."
    },
    {
      "brand": "Nature's Way",
      "product": "Glucomannan 665mg, Konjac Root (100 Capsules)",
      "slug": "natures-way-glucomannan-665mg",
      "form": "Capsule",
      "gramsPerServing": 0.665,
      "servingsPerContainer": 100,
      "price": 12.5,
      "costPerServing": 0.13,
      "costPerGram": 0.188,
      "capsulesForEfsaDose": 5,
      "costPerEfsaDose": 0.63,
      "note": "665mg glucomannan (konjac root) per capsule (label serving = 3 capsules / 1,995mg). The label itself instructs taking capsules with at least 8oz water 20 minutes before mealtime — an on-label confirmation of the water rule. Highest cost per gram of the 5 products verified; about 5 capsules are needed to approach the 3g EFSA dose."
    }
  ]
}