Top 8 Best Glucomannan Supplements for Weight Loss (2026)

⇄Compare all 8 picks side by sidefull score breakdown · strength & weakness · price▾

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All 8 picks side by side — one column per scoring criterion. Every row links to its full card below.

Product	Score	Dose vs the Trials30%	Label Directions & Safety20%	Testing & Manufacturing20%	Formulation & Form15%	Value15%	Price & buy
#1 NOW Foods Glucomannan 575 mgBest Overall	8.8	9.21	9.23	8.62	8.2	8.4	$16-18~$0.28 per 3-capsule serving (1.725 g)On AmazonFull review →
＋1.725 g of declared glucomannan per serving−Three capsules per serving
#2 NOW Foods Glucomannan Pure Powder 8 ozBest Budget Pure Powder	8.7	8.63	8.4	8.62	8.62	9.81	$15-17~$0.14 per 2 g servingOn AmazonFull review →
＋No other ingredients−Must be measured and drunk before it gels
#3 Nature's Way Glucomannan 1,995 mgBest Premium Clean Label	8.6	8.82	9.42	7.8	8.81	7.8	$12-14~$0.38 per 3-capsule serving (1.995 g)On AmazonFull review →
＋1.995 g of declared glucomannan per serving−Contains sulfites
#4 Best Naturals Konjac Root Glucomannan 2,000 mg (2-Pack)Best Bulk Buy	8.5	7.8	8.6	8.62	8.43	9.62	$17-19~$0.15 per 3-capsule serving (two bottles, 120 servings)On AmazonFull review →
＋Cheapest capsule per gram−Sold as a two-bottle pack
#5 Carlyle Glucomannan 2,400 mgBest Label Directions	8.3	8.0	9.61	8.0	7.4	8.63	$18-20~$0.38 per 4-capsule serving (2,400 mg)On AmazonFull review →
＋Most complete directions and safety notice−Gelatin capsule
#6 Nutricost Glucomannan 1,800 mgBest Third-Party Tested	7.7	8.0	6.0	8.81	7.2	8.63	$16-18~$0.28 per 3-capsule serving (1,800 mg)On AmazonFull review →
＋Third-party testing printed on the label−No choking warning on the bottle
#7 BulkSupplements Glucomannan Capsules 2,000 mgBest Two-Ingredient Capsule	7.5	7.0	6.0	8.43	8.62	8.2	$19-21~$0.33 per 4-capsule serving (2,000 mg)On AmazonFull review →
＋Veg capsule with one filler−Panel declares extract, not glucomannan
#8 Lipozene Maximum Strength 1,500 mgBest-Known Brand	6.7	8.63	9.0	5.0	5.0	4.0	$32-34~$0.55 per 2-capsule serving (1,500 mg)On AmazonFull review →
＋Before-each-meal schedule printed−Highest price per gram on the list

1. #1

   Best Overall
   SAC Studio‹›FACTS →

   NOW Foods Glucomannan 575 mg

   NOW Foods

   8.8/10SAC Product Score™ⓘ

   SAC Product Score™ — how it breaks downⓘ

   • Dose vs the Trials30%9.2
   • Label Directions & Safety20%9.2
   • Testing & Manufacturing20%8.6
   • Formulation & Form15%8.2
   • Value15%8.4

   1.725 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.

   $16-18

   ~$0.28 per 3-capsule serving (1.725 g)

   Form

   Veg capsule (hypromellose)

   Serving

   3 capsules

   Count

   180 capsules (60 servings)

   Per serving

   1.725 g glucomannan (from konjac root)

   Directions

   3 capsules 1 to 2 times daily with at least 8 oz. of water, 30-45 minutes before a meal

   Other ingredients

   Hypromellose, hydroxypropyl cellulose, silicon dioxide, microcrystalline cellulose, stearic acid (vegetable source)

   Seals

   GMP Quality Assured, Non-GMO, vegetarian/vegan

   Cost per dose

   ~$0.28 per serving

   Pros

   • ＋1.725 g of declared glucomannan per serving
   • ＋Water, timing and choking caution printed
   • ＋Vegetarian capsule, GMP-certified brand
   • ＋Dose splits before two meals

   Cons

   • −Three capsules per serving
   • −No third-party testing statement on the label
   • −Four excipients

   Our take — If you want to try glucomannan the way it was studied, this is the bottle that tells you how. Take three capsules with a full glass of water half an hour before your biggest meal, never dry and never lying down, and treat it as a fullness aid inside a calorie deficit rather than a fat burner.

   Check NOW on Amazon →Read the full review →
2. #2

   Best Budget Pure Powder
   

   NOW Foods Glucomannan Pure Powder 8 oz

   NOW Foods

   8.7/10SAC Product Score™ⓘ

   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

   Nothing but glucomannan: 2 g per half teaspoon, about 114 servings a jar, at half the cost per gram of any capsule here. It has to be measured, stirred and drunk before it gels.

   $15-17

   ~$0.14 per 2 g serving

   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

   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

   Our take — 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.

   Check NOW on Amazon →Read the full review →
3. #3

   Best Premium Clean Label
   

   Nature's Way Glucomannan 1,995 mg

   Nature's Way

   8.6/10SAC Product Score™ⓘ

   SAC Product Score™ — how it breaks downⓘ

   • Dose vs the Trials30%8.8
   • Label Directions & Safety20%9.4
   • Testing & Manufacturing20%7.8
   • Formulation & Form15%8.8
   • Value15%7.8

   1.995 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.

   $12-14

   ~$0.38 per 3-capsule serving (1.995 g)

   Form

   Vegan capsule (hypromellose)

   Serving

   3 capsules

   Count

   100 capsules (33 servings)

   Per serving

   1.995 g glucomannan (from Amorphophallus konjac root)

   Directions

   3 capsules with at least 8 oz. (full glass) of water about 20 minutes before mealtime

   Other ingredients

   Plant-derived capsule (hypromellose), magnesium stearate; contains sulfites

   Seals

   Non-GMO Project Verified, vegan, gluten-free, dairy-free

   Cost per dose

   ~$0.38 per serving

   Pros

   • ＋1.995 g of declared glucomannan per serving
   • ＋Only one excipient, vegan capsule
   • ＋Non-GMO Project Verified
   • ＋Most complete choking warning

   Cons

   • −Contains sulfites
   • −No testing statement on the panel
   • −Only 33 servings a bottle

   Our take — Nature's Way gets the dose, the directions and the warning right and adds almost nothing to the fiber. You pay for that in bottle size. If the ingredient list is your first filter, buy it; if value is, NOW or Best Naturals gives you the same grams for less.

   Check Nature's on Amazon →Read the full review →
4. #4

   Best Bulk Buy
   

   Best Naturals Konjac Root Glucomannan 2,000 mg (2-Pack)

   Best Naturals

   8.5/10SAC Product Score™ⓘ

   SAC Product Score™ — how it breaks downⓘ

   • Dose vs the Trials30%7.8
   • Label Directions & Safety20%8.6
   • Testing & Manufacturing20%8.6
   • Formulation & Form15%8.4
   • Value15%9.6

   Two 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.

   $17-19

   ~$0.15 per 3-capsule serving (two bottles, 120 servings)

   Form

   Vegetarian capsule (vegetable cellulose)

   Serving

   3 capsules

   Count

   2 bottles x 180 capsules (60 servings each)

   Per serving

   2,000 mg konjac root (glucomannan)

   Directions

   3 capsules daily with at least 8 oz of water, 30-45 minutes before a meal

   Other ingredients

   Capsule (vegetable cellulose), silicon dioxide, magnesium stearate (vegetable source), microcrystalline cellulose

   Seals

   3rd Party Lab Tested, GMP, made in USA

   Cost per dose

   ~$0.15 per serving

   Pros

   • ＋Cheapest capsule per gram
   • ＋Timing, water and choking caution printed
   • ＋Vegetarian capsule
   • ＋Third-party lab testing claimed on the label

   Cons

   • −Sold as a two-bottle pack
   • −Listing graphic contradicts the panel
   • −Once-daily direction only

   Our take — If you already know glucomannan agrees with you and want months of it cheaply, this two-pack is the sensible purchase. Trust the Supplement Facts panel over the listing art, take it with a full glass of water before a meal, and split the three capsules across two meals if one large dose sits heavily.

   Check Best on Amazon →Read the full review →
5. #5

   Best Label Directions
   

   Carlyle Glucomannan 2,400 mg

   Carlyle

   8.3/10SAC Product Score™ⓘ

   SAC Product Score™ — how it breaks downⓘ

   • Dose vs the Trials30%8.0
   • Label Directions & Safety20%9.6
   • Testing & Manufacturing20%8.0
   • Formulation & Form15%7.4
   • Value15%8.6

   2,400 mg of glucomannan per four quick-release capsules with the most useful directions on the list: water, timing, a choking notice, not before sleep and a gap from medications. Gelatin capsule, one large daily serving.

   $18-20

   ~$0.38 per 4-capsule serving (2,400 mg)

   Form

   Quick-release capsule (gelatin)

   Serving

   4 capsules

   Count

   200 capsules (50 servings)

   Per serving

   2,400 mg glucomannan (from konjac root)

   Directions

   4 capsules daily with at least 8 ounces of water or other fluid, 30 to 60 minutes before or with a meal

   Other ingredients

   Gelatin capsule, rice powder, vegetable magnesium stearate

   Seals

   Non-GMO, GMP, packaged and lab tested in the USA

   Cost per dose

   ~$0.38 per serving

   Pros

   • ＋Most complete directions and safety notice
   • ＋Medication-spacing guidance printed
   • ＋2,400 mg of declared glucomannan per serving
   • ＋Low cost per gram for a capsule

   Cons

   • −Gelatin capsule
   • −Four capsules per serving
   • −Testing is the brand's own statement

   Our take — Carlyle earns its place on directions. If you are on medication, or simply want a bottle that tells you everything, it is the careful choice. Vegetarians and anyone wanting an independent testing claim should look two places up the list.

   Check Carlyle on Amazon →Read the full review →
6. #6

   Best Third-Party Tested
   

   Nutricost Glucomannan 1,800 mg

   Nutricost

   7.7/10SAC Product Score™ⓘ

   SAC Product Score™ — how it breaks downⓘ

   • Dose vs the Trials30%8.0
   • Label Directions & Safety20%6.0
   • Testing & Manufacturing20%8.8
   • Formulation & Form15%7.2
   • Value15%8.6

   1,800 mg of glucomannan per three capsules with third-party testing and a GMP-compliant facility printed on the bottle; the directions give water but no meal timing and no choking warning, and the capsule is gelatin.

   $16-18

   ~$0.28 per 3-capsule serving (1,800 mg)

   Form

   Capsule (gelatin)

   Serving

   3 capsules

   Count

   180 capsules (60 servings)

   Per serving

   1,800 mg glucomannan (from konjac root extract)

   Directions

   3 capsules daily with 8-12 oz of water

   Other ingredients

   Gelatin capsule, rice extract blend (rice extract, rice hulls, gum arabic, sunflower oil), calcium laurate

   Seals

   Third Party Tested, GMP Compliant Facility, Non-GMO, gluten-free

   Cost per dose

   ~$0.28 per serving

   Pros

   • ＋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

   Cons

   • −No choking warning on the bottle
   • −No pre-meal timing in the directions
   • −Gelatin capsule, although the listing says vegan

   Our take — 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.

   Check Nutricost on Amazon →Read the full review →
7. #7

   Best Two-Ingredient Capsule
   

   BulkSupplements Glucomannan Capsules 2,000 mg

   BulkSupplements

   7.5/10SAC Product Score™ⓘ

   SAC Product Score™ — how it breaks downⓘ

   • Dose vs the Trials30%7.0
   • Label Directions & Safety20%6.0
   • Testing & Manufacturing20%8.4
   • Formulation & Form15%8.6
   • Value15%8.2

   A vegetarian capsule with only rice flour added, third-party tested per the listing; the panel declares 2,000 mg of konjac root extract rather than a glucomannan amount, and the listing shows no timing or choking warning.

   $19-21

   ~$0.33 per 4-capsule serving (2,000 mg)

   Form

   Veg capsule (hypromellose)

   Serving

   4 capsules

   Count

   240 capsules (60 servings)

   Per serving

   2,000 mg konjac root extract (Amorphophallus konjac root)

   Glucomannan content

   Not stated on the panel

   Directions

   4 capsules with 8-12 oz of water (listing gallery)

   Other ingredients

   Rice flour, hypromellose capsules

   Seals

   Gluten-free, soy-free, dairy-free; third-party tested and cGMP (listing)

   Cost per dose

   ~$0.33 per serving

   Pros

   • ＋Veg capsule with one filler
   • ＋Third-party tested and cGMP per the listing
   • ＋240 capsules, 60 servings
   • ＋Allergens: none

   Cons

   • −Panel declares extract, not glucomannan
   • −No timing or choking warning shown in the listing
   • −Four capsules per serving

   Our take — 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.

   Check BulkSupplements on Amazon →Read the full review →
8. #8

   Best-Known Brand
   

   Lipozene Maximum Strength 1,500 mg

   Lipozene

   6.7/10SAC Product Score™ⓘ

   SAC Product Score™ — how it breaks downⓘ

   • Dose vs the Trials30%8.6
   • Label Directions & Safety20%9.0
   • Testing & Manufacturing20%5.0
   • Formulation & Form15%5.0
   • Value15%4.0

   The famous blue diet pill is konjac glucomannan: 1,500 mg per two capsules, up to three times a day before meals, with the choking warning printed. It costs more than twice as much per gram as NOW, in a gelatin capsule with titanium dioxide and FD&C Blue #1, and prints no testing statement.

   $32-34

   ~$0.55 per 2-capsule serving (1,500 mg)

   Form

   Capsule (gelatin)

   Serving

   2 capsules

   Count

   120 capsules (60 servings)

   Per serving

   1,500 mg proprietary blend: Amorphophallus konjac (from konjac root)

   Directions

   2 capsules 30 minutes before meals, up to three times per day, with at least 8 oz. of water

   Other ingredients

   Gelatin, water, titanium dioxide, stearic acid, cellulose, magnesium silicate, artificial color (FD&C Blue #1)

   Seals

   None printed

   Cost per dose

   ~$0.55 per serving

   Pros

   • ＋Before-each-meal schedule printed
   • ＋Complete choking warning
   • ＋Two capsules per serving
   • ＋Widely available

   Cons

   • −Highest price per gram on the list
   • −Artificial color and titanium dioxide
   • −No testing statement
   • −'Clinically proven' claim not backed by the pooled trials

   Our take — Lipozene is not a scam ingredient; it is ordinary glucomannan with good directions. It is an expensive way to buy it, in a capsule with additives the others avoid, behind a claim the independent evidence does not support. Buy NOW and follow Lipozene's schedule.

   Check Lipozene on Amazon →Read the full review →

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