NOW Foods Glucomannan Pure Powder 8 oz Review
#2 of 8 · Best Budget Pure Powder✓ Label verified · Supplement Facts read Oct 6, 2026Real retailer photo, cut out. Label unedited.
Buy it if price per gram matters most and you do not mind measuring. For about fourteen cents a serving you get 2 g of pure glucomannan, vegetarian, with nothing added and the right directions on the jar.
$15-17~$0.14 per 2 g serving
Why It Scores 8.7 — And The Label Line Behind Each Number
Dose vs the Trials
30% of score2 g of glucomannan per serving, one to two times daily before a meal, is inside the studied range; the half-teaspoon measure is approximate and the trials used capsules.
- Per serving
- 2 g glucomannan (from konjac root)
Label Directions & Safety
20% of scoreSame printed water rule, timing and choking caution as the capsule; a loose gelling powder asks more care of the user than a capsule does.
- Directions
- 1/2 level teaspoon 1 to 2 times daily with at least 8 oz. of water, 30-45 minutes before a meal
Testing & Manufacturing
20% of scoreGMP Quality Assured seal on the label and Intertek GMP certification in the gallery; packaged and quality tested in the USA; no third-party potency statement.
- Seals
- GMP Quality Assured, Non-GMO, vegetarian/vegan, kosher, halal
Formulation & Form
15% of scoreOther ingredients: none. The cleanest line on the list, offset by a powder that must be stirred into water and drunk before it thickens.
- Form
- Powder
- Other ingredients
- None
Value
15% of scoreAbout $0.14 per 2 g serving, the lowest cost per gram here.
- Serving
- 1/2 level teaspoon (approx. 2 g)
- Count
- 8 oz (227 g), about 114 servings
- Cost per dose
- ~$0.14 per serving
Label verified. Every figure read from the Supplement Facts photo, Oct 6, 2026.
Marketing Claims Vs. Reality
Pure powder, from konjac root.
The panel lists glucomannan from konjac root and, under other ingredients, none.
Healthy weight management.
Fair as a satiety aid inside a diet; the pooled trials did not find significant weight loss from glucomannan alone (Onakpoya 2014).
Supports regularity.
Glucomannan is a soluble, bulk-forming fiber; the label states the claim with the standard FDA disclaimer.
What Our Test Actually Found
The cheapest gram, with a handling cost
Per gram this jar costs less than half of what most of the capsules do. You pay in convenience: the powder has to be measured, stirred into a full glass and drunk immediately, because it sets into a gel.
Never take it dry
The choking caution on the jar applies with extra force to loose powder. Mixed into at least 8 oz. of water it is the same fiber the trials used; taken dry it is the form most likely to swell where it should not.
Full analysis: all pros & cons (7), buy if / skip if
- No other ingredients
- Lowest cost per gram on the list
- Right directions and caution printed
- About 114 servings a jar
- Must be measured and drunk before it gels
- Approximate half-teaspoon dose
- Not portable
- You want the lowest cost per gram
- You want no capsule and no excipients
- You are comfortable measuring and drinking it quickly
- You want a precise, portable dose
- You dislike thick, gel-like drinks
- You have any swallowing difficulty
For about fourteen cents a serving you get 2 g of pure glucomannan, vegetarian, with nothing added and the right directions on the jar. The trials used capsules, and a level half teaspoon is an approximate measure, so it scores a little under the capsule on dose precision and handling. If you will actually stir it into a full glass of water every time, it is the best value here.
NOW's powder is the same fiber as its capsules without the capsule. The panel lists 2 g of glucomannan per half level teaspoon, about 114 servings in the 8 oz (227 g) jar, and under other ingredients it says: none. Directions mirror the capsule: half a level teaspoon one to two times daily with at least 8 oz. of water, 30 to 45 minutes before a meal, with the same caution about swelling in the throat. The catch is practical. Glucomannan thickens within a minute or two, so you stir and drink at once.
The value pick, for people who will mix it properly
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. If that sounds like a chore you will skip, buy the capsule; the dose you take is the one that counts.
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.
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.
04Best Naturals 2-Pack
If you already know glucomannan agrees with you and want months of it cheaply, this two-pack is the sensible purchase.
Quick Answers
How do you take glucomannan powder?
Stir half a level teaspoon, about 2 g, into at least 8 oz. of water and drink it at once, 30 to 45 minutes before a meal, one to two times daily. It thickens within a minute or two, so do not let it stand, and never swallow it dry.
Is glucomannan powder better than capsules?
It is the same fiber for less money and with no excipients. The trials used capsules, which give an exact dose and are easier to take correctly. Choose powder for price, capsules for precision.
Sources & Further Reading
2 peer-reviewed sources, each linked to PubMed
- [1] Walsh DE, et al. Int J Obes. 1984;8(4):289-93. PMID 6096282 — Effect of glucomannan on obese patients: a clinical study. In an eight-week double-blind trial in 20 obese subjects, 1 g of glucomannan with 8 oz of water one hour before each of three meals produced a mean weight loss of 5.5 lb and lowered total and LDL cholesterol; no adverse reactions were reported.
- [2] 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.
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