Verified
“Pure powder, from konjac root.”
The panel lists glucomannan from konjac root and, under other ingredients, none.
NOW Foods Glucomannan Pure Powder 8 oz Review
SAC StudioBest Budget Pure PowderBUY
8.7/10SAC Product Score™
How the score breaks downHide breakdown
SAC Product Score™ — how it breaks down
- Dose vs the Trials30%8.6
- Label Directions & Safety20%8.4
- Testing & Manufacturing20%8.6
- Formulation & Form15%8.6
- Value15%9.8
Buy it if price per gram matters most and you do not mind measuring
✓ Buy if…
- You want the lowest cost per gram
- You want no capsule and no excipients
✗ Skip if…
- You want a precise, portable dose
- You dislike thick, gel-like drinks
Read the full analysis
✓ Also buy if…
- You are comfortable measuring and drinking it quickly
✗ Also skip if…
- You have any swallowing difficulty
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.
How we built the SAC Product Score™ — 8.7/10
Dose vs the Trials30%8.6/10
2 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.
Label Directions & Safety20%8.4/10
Same printed water rule, timing and choking caution as the capsule; a loose gelling powder asks more care of the user than a capsule does.
Testing & Manufacturing20%8.6/10
GMP 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.
Formulation & Form15%8.6/10
Other ingredients: none. The cleanest line on the list, offset by a powder that must be stirred into water and drunk before it thickens.
Value15%9.8/10
About $0.14 per 2 g serving, the lowest cost per gram here.
The product at a glance
- Form
- Powder
- Serving
- 1/2 level teaspoon (approx. 2 g)
- Count
- 8 oz (227 g), about 114 servings
- Per serving
- 2 g glucomannan (from konjac root)
- Directions
- 1/2 level teaspoon 1 to 2 times daily with at least 8 oz. of water, 30-45 minutes before a meal
- Other ingredients
- None
- Seals
- GMP Quality Assured, Non-GMO, vegetarian/vegan, kosher, halal
- Cost per dose
- ~$0.14 per serving
Marketing claims vs. reality
Partial
“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).
Verified
“Supports regularity.”
Glucomannan is a soluble, bulk-forming fiber; the label states the claim with the standard FDA disclaimer.
What our test actually found
01The 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.
02Never 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.
Pros & cons, no sugar-coating
Pros
- No other ingredients
- Lowest cost per gram on the list
- Right directions and caution printed
- About 114 servings a jar
Cons
- Must be measured and drunk before it gels
- Approximate half-teaspoon dose
- Not portable
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.
Affiliate link — Super Achiever Club earns a small commission at no extra cost to you.
If this doesn’t fit — try these
NOW Glucomannan 575 mg
8.8/101.725 g of glucomannan per three vegetarian capsules, taken once or twice a day before a meal, with the water rule, the timing and the choking caution all printed on the bottle.
See it on the list →Nature's Way Glucomannan
8.6/101.995 g of glucomannan per three vegan capsules with only magnesium stearate added, Non-GMO Project Verified, and the fullest choking warning on the list; the smallest bottle and the highest price per gram among the plain capsules.
See it on the list →Best Naturals Konjac Root
8.5/10Two bottles of 180 vegetarian capsules, 2,000 mg of konjac root glucomannan per three, third-party lab tested per the label, with the water rule and choking caution printed; a once-a-day direction and a sloppy listing graphic hold it back.
See it on the list →Sources & further reading
- Walsh DE, et al. Int J Obes. 1984;8(4):289-93.Walsh DE, Yaghoubian V, Behforooz A · 1984 · International Journal of Obesity · 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.
- Vanderbeek PB, et al. Clin Toxicol (Phila). 2007;45(1):80-2.Vanderbeek PB, Fasano C, O'Malley G, Hornstein J · 2007 · Clinical Toxicology · 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.