Nutricost Glucomannan 1,800 mg Review
#6 of 8 · Best Third-Party Tested✓ Label verified · Supplement Facts read Oct 6, 2026Real retailer photo, cut out. Label unedited.
Buy it if a printed third-party testing claim is your first filter, and add the missing directions yourself. On testing this is the strongest label of the eight, and the dose and price are fair.
$16-18~$0.28 per 3-capsule serving (1,800 mg)
Why It Scores 7.7 — And The Label Line Behind Each Number
Dose vs the Trials
30% of score1,800 mg of declared glucomannan a day is near the low end of the studied range, taken as one serving with no pre-meal direction.
- Per serving
- 1,800 mg glucomannan (from konjac root extract)
Label Directions & Safety
20% of score8-12 oz of water is printed; meal timing is not, and the bottle carries no choking or swallowing warning.
- Directions
- 3 capsules daily with 8-12 oz of water
Testing & Manufacturing
20% of scoreThird Party Tested, GMP Compliant Facility and Non-GMO printed on the label; made and quality tested in the USA.
- Seals
- Third Party Tested, GMP Compliant Facility, Non-GMO, gluten-free
Formulation & Form
15% of scoreGelatin capsule with a rice extract blend and calcium laurate; gluten-free. Not suitable for vegans despite the listing's wording.
- Form
- Capsule (gelatin)
- Other ingredients
- Gelatin capsule, rice extract blend (rice extract, rice hulls, gum arabic, sunflower oil), calcium laurate
Value
15% of scoreAbout $0.28 per 1,800 mg serving, among the lower costs per gram for a capsule.
- Serving
- 3 capsules
- Count
- 180 capsules (60 servings)
- Cost per dose
- ~$0.28 per serving
Label verified. Every figure read from the Supplement Facts photo, Oct 6, 2026.
Marketing Claims Vs. Reality
1,800 mg per serving.
The panel declares 1,800 mg of glucomannan from konjac root extract per three capsules.
Third party tested.
Printed on the bottle. No lab is named and no certificate is linked, so we can confirm the claim, not the result.
Vegan.
The listing says vegan. The other-ingredients line on the bottle names a gelatin capsule, misspelled as 'geltain'.
What Our Test Actually Found
A testing claim on the bottle, not just the listing
Third Party Tested and GMP Compliant Facility are printed on the label. That is more than NOW, Nature's Way or Carlyle commit to in print, and it is why this capsule scores highest on testing.
The missing warning
The suggested use gives a serving and a water volume. There is no timing and no word about choking. For a fiber with documented cases of esophageal obstruction, that omission costs it more than any other single line on the list.
Full analysis: all pros & cons (7), buy if / skip if
- Third-party testing printed on the label
- GMP-compliant facility, Non-GMO, gluten-free
- Fair price for 60 servings
- 1,800 mg of declared glucomannan
- No choking warning on the bottle
- No pre-meal timing in the directions
- Gelatin capsule, although the listing says vegan
- You want Third Party Tested printed on the bottle
- You want a fair price for 60 servings
- You already know how to take glucomannan safely
- You are vegan; the capsule is gelatin
- You want the label to carry the choking warning
- You want pre-meal timing spelled out
On testing this is the strongest label of the eight, and the dose and price are fair. But glucomannan is the one fiber where the directions are a safety matter, and Nutricost's bottle omits both the pre-meal timing and the choking warning. If you buy it, follow the rule the other labels print: a full glass of water, half an hour before a meal, never dry.
Nutricost prints what many budget brands leave to the listing: Third Party Tested, GMP Compliant Facility and Non-GMO are on the bottle itself. Three capsules give 1,800 mg of glucomannan from konjac root extract, 60 servings. The weak side is the directions. The label says to take three capsules daily with 8-12 oz of water and stops there: no time before a meal, and no warning about choking, which every other capsule here with a readable label carries. The capsule is gelatin, with a rice extract blend and calcium laurate.
Well tested, under-labelled
Nutricost's glucomannan is a sound product let down by its instructions. If you know to take it with a full glass of water before a meal and never dry, it is a fair buy. If you want the bottle to tell you that, NOW and Carlyle do.
If This Doesn’t Fit — Try These
01NOW Foods 575 mg
If you want to try glucomannan the way it was studied, this is the bottle that tells you how.
02NOW Pure Powder
If you are disciplined about stirring half a teaspoon into a full glass of water and drinking it straight away, NOW's powder gives you the studied fiber for pennies.
03Nature's Way 1,995 mg
Nature's Way gets the dose, the directions and the warning right and adds almost nothing to the fiber.
Quick Answers
Is Nutricost Glucomannan vegan?
No. The listing says vegan, but the other-ingredients line on the bottle lists a gelatin capsule. Vegetarians and vegans should choose NOW, Nature's Way or Best Naturals.
How should I take Nutricost Glucomannan?
The label says three capsules daily with 8-12 oz of water. It does not give a time, so follow the pattern the trials and the other labels use: about half an hour before a meal, with a full glass of water, never dry or lying down.
Sources & Further Reading
2 peer-reviewed sources, each linked to PubMed
- [1] Vanderbeek PB, et al. Clin Toxicol (Phila). 2007;45(1):80-2. PMID 17357389 — Esophageal obstruction from a hygroscopic pharmacobezoar containing glucomannan. A case report of esophageal obstruction from a glucomannan-containing product; the authors note that the fiber is strongly hygroscopic and expands rapidly to many times its original size.
- [2] Keithley JK, et al. J Obes. 2013;2013:610908. PMID 24490058 — Safety and efficacy of glucomannan for weight loss in overweight and moderately obese adults. In 53 overweight and moderately obese adults, 1.33 g of glucomannan with 8 oz of water one hour before each meal for eight weeks was well tolerated but produced no more weight loss than placebo and did not change body composition, hunger or fullness.
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