BulkSupplements Glucomannan Capsules 2,000 mg Review
#7 of 8 · Best Two-Ingredient Capsule✓ Label verified · Supplement Facts read Oct 6, 2026Real retailer photo, cut out. Label unedited.
Buy it if you want a short ingredient line and accept an extract weight instead of a fiber amount. Seven of the eight products here tell you how many milligrams of glucomannan you are taking.
$19-21~$0.33 per 4-capsule serving (2,000 mg)
Why It Scores 7.5 — And The Label Line Behind Each Number
Dose vs the Trials
30% of scoreThe panel declares 2,000 mg of konjac root extract per serving, not a glucomannan amount; the trials dosed glucomannan itself.
- Per serving
- 2,000 mg konjac root extract (Amorphophallus konjac root)
- Glucomannan content
- Not stated on the panel
Label Directions & Safety
20% of scoreThe gallery's suggested use gives four capsules with 8-12 oz of water; no meal timing and no choking warning appear in the listing images.
- Directions
- 4 capsules with 8-12 oz of water (listing gallery)
Testing & Manufacturing
20% of scoreThird Party Tested and cGMP badges in the listing gallery; no lab named on the panel image.
- Seals
- Gluten-free, soy-free, dairy-free; third-party tested and cGMP (listing)
Formulation & Form
15% of scoreHypromellose capsule and rice flour only; gluten-free, soy-free and dairy-free, allergens: none.
- Form
- Veg capsule (hypromellose)
- Other ingredients
- Rice flour, hypromellose capsules
Value
15% of scoreAbout $0.33 per four-capsule serving, mid-pack per gram of extract.
- Serving
- 4 capsules
- Count
- 240 capsules (60 servings)
- Cost per dose
- ~$0.33 per serving
Label verified. Every figure read from the Supplement Facts photo, Oct 6, 2026.
Marketing Claims Vs. Reality
Glucomannan capsules, 2000 mg per serving.
The front and title say glucomannan; the Supplement Facts panel declares 2,000 mg of konjac root extract, with no separate figure for the fiber itself.
Third party tested.
Shown as a badge in the listing gallery. No lab is named and the claim is not on the panel image.
Gluten free, soy free, dairy free.
All three marks appear with the panel, and the allergen line reads none.
What Our Test Actually Found
Extract weight is not fiber weight
Konjac root extract is where glucomannan comes from, and a good extract is mostly glucomannan. The panel still declares the extract, which leaves the actual fiber dose to trust. Every other capsule brand on this list prints the glucomannan figure.
Directions by infographic
The only usage instruction we could find is a listing graphic: four capsules with 8-12 oz of water. There is no label photograph of a caution panel in the gallery, so we could not confirm a choking warning.
Full analysis: all pros & cons (7), buy if / skip if
- Veg capsule with one filler
- Third-party tested and cGMP per the listing
- 240 capsules, 60 servings
- Allergens: none
- Panel declares extract, not glucomannan
- No timing or choking warning shown in the listing
- Four capsules per serving
- You want a veg capsule with a single filler
- You value the brand's third-party testing badge
- You are comfortable with an undeclared glucomannan content
- You want the panel to state glucomannan, as the trials dosed it
- You want timing and a choking warning in the directions
- You want fewer than four capsules a serving
Seven of the eight products here tell you how many milligrams of glucomannan you are taking. This one tells you how much konjac root extract. It is probably mostly glucomannan, but the panel does not commit to it, and the trials dosed the fiber. Add a listing with no timing or choking warning and it lands near the bottom despite a clean capsule and a fair price.
BulkSupplements keeps the capsule simple, hypromellose and rice flour, and the listing carries third-party-tested and cGMP badges. The Supplement Facts panel is where it parts company with the rest of the list: it declares 2,000 mg of konjac root extract per four veg capsules and does not say how much of that is glucomannan. The suggested use shown in the gallery is four capsules with 8-12 oz of water; we found no pre-meal timing and no choking warning anywhere in the listing images. 240 capsules, 60 servings.
A clean capsule with an imprecise panel
BulkSupplements makes a tidy two-ingredient capsule and backs it with a testing badge. For glucomannan, though, the dose of fiber and the way you take it are the product, and this listing is vague on both. Choose it for the ingredient line; choose NOW for the label.
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
How much glucomannan is in BulkSupplements capsules?
The panel does not say. It declares 2,000 mg of konjac root extract per four capsules. Glucomannan is the main fiber in konjac root, but the label does not state the percentage.
Is konjac root extract the same as glucomannan?
Glucomannan is the soluble fiber extracted from konjac root, so a purified extract is largely glucomannan. They are not identical terms, and the trials dosed measured glucomannan.
Sources & Further Reading
2 peer-reviewed sources, each linked to PubMed
- [1] Keithley J, Swanson B. Altern Ther Health Med. 2005;11(6):30-4. PMID 16320857 — Glucomannan and obesity: a critical review. A critical review concluding that at 2 to 4 g per day glucomannan was well tolerated and produced significant weight loss in overweight and obese individuals, probably by promoting satiety and fecal energy loss, while calling for further safety and efficacy trials.
- [2] Zalewski BM, et al. Nutrition. 2015;31(3):437-42.e2. PMID 25701331 — The effect of glucomannan on body weight in overweight or obese children and adults: a systematic review of randomized controlled trials. A systematic review of six randomized trials found some short-term reductions in body weight in individual adult trials but no favorable effect of glucomannan on body mass index in any trial.
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