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Dietary supplement

Glucomannan from Konjack Root 1,995 mg Ingredients & Drug Interactions

by Nature's Way

Glucomannan from Konjack Root 1,995 mg label
See full label image
Capsule Category: Fiber And Other Nutrients
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 16, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Glucomannan from Konjack Root 1,995 mg against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.

Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy

The interaction bottom line Most serious interaction: Moderate

Glucomannan from Konjack Root 1,995 mg is a dietary supplement by Nature's Way with 1 active ingredient. Its ingredients are commonly taken for weight loss and appetite control, constipation, high cholesterol.Based on those ingredients, 2,022 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Glucomannan. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against Glucomannan from Konjack Root 1,995 mg by Nature's Way

Ask about any prescription or over-the-counter medication and we check it for interactions with Glucomannan from Konjack Root 1,995 mg by Nature's Way — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Glucomannan from Konjack Root 1,995 mg by Nature's Way

Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.

From our pharmacy team — supplement deep dive

Generated from HelloPharmacist’s pharmacist-curated databases and editorial rules · Last generated Jul 30, 2026

What’s inside

Full disclosure
Ingredient Transparency · database check
Full

Every active ingredient lists its own amount on the label.

Why this rating?
  • The label discloses an exact amount for 1 of its 1 active ingredient.
  • No proprietary blends here — you can verify the dose of every single component.

This product contains one active ingredient: glucomannan at 1,995 mg per capsule. Glucomannan is a soluble fiber derived from konjac root that absorbs water and forms a thick gel in your digestive tract — that's how it works to bulk up your stool and affect how your body handles cholesterol and blood sugar.

The capsule also contains two inactive ingredients: hypromellose (a capsule binder) and magnesium stearate (a flow agent). These are standard excipients that help the product hold together.

Does it work?

Moderate evidence
Evidence for Intended Use · database check
By FDA rules, dietary supplements can’t claim to treat, cure, or prevent disease — so labels speak in careful marketing language. We discern each product’s intended use from its name, label claims, and label statements, then grade the clinical evidence for that use. How these ratings are computed
Moderate

Some clinical evidence supports this product's ingredients for its stated purpose, but it isn't conclusive.

Why this rating?
  • The label markets this product for: promotes feelings of fullness.
  • We looked for evidence on: Obesity, Constipation, Diabetes, Hyperlipidemia, appetite suppression, weight management.
  • The strongest evidence on file: Glucomannan is rated "Possibly Effective" for Constipation (Natural Medicines).
  • Also on file: Glucomannan is rated "Possibly Effective" for Diabetes, Hyperlipidemia.
  • Also on file: Glucomannan is rated "Insufficient Reliable Evidence To Rate" for Obesity.

Glucomannan is possibly effective for constipation, diabetes, and high cholesterol (hyperlipidemia) — meaning the evidence suggests it may help, but more reliable studies are still needed. For high blood pressure (hypertension), there isn't enough reliable evidence to know whether it works.

The evidence, ingredient by ingredient Glucomannan

How safe is it?

Well-documented data
Safety Information · database check
Well characterized

Adverse-effect, pregnancy, and general safety data are on file for most of these ingredients.

Why this rating?
  • We hold adverse-effect (side-effect) data for 1 of the 1 matched ingredient.
  • Pregnancy & breastfeeding safety ratings cover 1 of 1.
  • General safety write-ups exist for 1 of 1.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Glucomannan is generally well tolerated when you take it with plenty of water. However, it can cause stomach upset — abdominal pain, bloating, gas, nausea, diarrhea, or constipation, especially at doses above 3 grams daily.

In rare cases, if taken as a dry powder or without enough liquid, it can cause choking or a blockage in your esophagus or intestines; always swallow capsules with a full glass of water. There isn't enough reliable data on its safety during pregnancy, and little is known about its safety while breastfeeding — talk with your doctor or pharmacist for personalized advice if you're pregnant, planning to become pregnant, or nursing.

Side effects, ingredient by ingredient Glucomannan

Meds to double-check

Moderate interaction found
Known Interaction Concern · database check
Moderate identified

The most serious documented interaction for these ingredients is Moderate. Check your medications for a personalized result.

Why this rating?
  • 1 of the 1 matched ingredient can interact with medications — Glucomannan.
  • The most serious interaction on file is rated Moderate.
  • For scale: 2,023 individual medications appear in the full list. A big number alone doesn't make a product dangerous — what matters is whether YOUR medication is on it, so run yours through the interaction checker on this page.

Before you take this product, double-check all your oral medications — anything you swallow by mouth may be affected. The biggest concern is diabetes drugs like glyburide, but blood pressure and cholesterol medications are also at risk.

Space your doses at least a few hours apart, and talk with your doctor or pharmacist to plan the safest schedule.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFully disclosed formula with some supporting evidence for its stated purpose. Moderate medication interactions have been identified, and safety information is well characterized.

Glucomannan may help with constipation, blood sugar, or cholesterol if the evidence holds up for you — but because it can reduce how your body absorbs oral medications, you'll need to space out your doses carefully. Check your exact medications with the tool on this page and discuss timing with your doctor or pharmacist before you start.

Always take it with plenty of water and never as a dry powder.

Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI

Assessment coverage: 1 of 1 active ingredient matched to our full ingredient reviews (monographs). Based on the product label dated Jan 22, 2022.

This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed

At a glance

General information

Key facts about Glucomannan from Konjack Root 1,995 mg, straight from the product label.

Brand Nature's Way
Barcode (UPC) 033674136751
Net contents 100 Vegan Capsule(s)
Market status On market
Date entered into DSLD Jan 22, 2022
DSLD ID 259395
Product type Fiber And Other Nutrients
Supplement form Capsule
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Vegan, Vegetarian, Adult (18 - 50 Years), Gluten Free, Dairy Free, Sugar Free
From the label
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.

Supplement Facts

The label details for Glucomannan from Konjack Root 1,995 mg by Nature's Way, sourced from the NIH Dietary Supplement Label Database.

Supplement Facts

Daily Value (DV) Target Group(s):
Adults and children 4 or more years of age
Minimum serving Sizes:
3 Capsule(s)
Maximum serving Sizes:
3 Capsule(s)
Servings per container
33
UPC/BARCODE
033674136751
IngredientAmount% DV
Total Carbohydrates2 Gram(s)1%
Glucomannan1.995 Gram(s)--

Other ingredients: Hypromellose, Magnesium Stearate

Tap any ingredient to jump to its full detail below.

Label statements
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
Formulation

Promotes feelings of fullness

Non GMO Project Verified - nongmoproject.org

Gluten free. No sugar, salt, yeast, wheat, corn, soy, dairy products, or artificial colors, flavors, or preservatives.

Vegan

General Statements

At Nature's Way, we believe nature knows best. So, we start by sourcing botanicals from the places they grow best. Then we use three distinct levels of scientific testing methods to ensure ingredients meet our uncompromising standards. Look for the Tru-ID logo to find products certified for authenticity by independent, third-party testing.

Bottles made from 97% post-consumer recycled plastic

FDA Disclaimer Statement

These statements have not been evaluated by the Food & Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Brand IP Statement(s)

Nature's Way Since 1969

Copyright 2019 Nature's Way Brands, LLC

Seals/Symbols

Certified Authentic - Tru-ID Non GMO Project Verified - nongmoproject.org

Quality Global Sourcing - Bottled & Tested in the USA

Formula

1,995 mg per serving

FDA Statement of Identity

Dietary Supplement

Suggested/Recommended/Usage/Directions

Recommendation: Take 3 capsules with at least 8 oz. of water (full glass) approximately 20 minutes before mealtime.

Precautions

Warning: Take this product with at least a full glass of water. Taking this product without adequate fluid may cause it to swell and block your throat or esophagus and may cause choking. Do not take this product if you have difficulty swallowing. If you experience chest pain, vomiting or difficulty swallowing or breathing after taking this product, seek immediate medical attention.

If pregnant, nursing, or taking any medications, consult a healthcare professional before use.

Contains sulfites.

Keep out of reach of children.

Safety sealed with printed inner seal. Do not use if seal is broken or missing.

Is this label outdated? Report a formula or label change and our pharmacy team will review it.

See for yourself

Glucomannan from Konjack Root 1,995 mg by Nature's Way label

The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.

Glucomannan from Konjack Root 1,995 mg label

Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.

View the full label (PDF)
What’s inside

The Ingredients in Glucomannan from Konjack Root 1,995 mg by Nature's Way

This is the 1 active ingredient this product is made of. Select it to open its full monograph.

Serving size3 Capsule(s) Dosage formCapsule Servings per container33 Amounts shown are per serving.

Glucomannan

Interacts with
2,022 drugs
1.995 Gram(s) per serving Form: Amorphophallus konjac

Glucomannan is a soluble fiber from the konjac root that swells into a gel in your stomach, which may help with mild weight loss, constipation, and mo...

Glucomannan monograph & interactions

Other (inactive) ingredients: Hypromellose, Magnesium Stearate. These complete the product’s ingredient list but are not active constituents.

Interaction report

Glucomannan from Konjack Root 1,995 mg by Nature's Way Drug Interactions

Want to check YOUR meds against Glucomannan from Konjack Root 1,995 mg?

Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.

 Go to the checker
2,022Drugs
2,022 Moderate

Ingredients driving the most interactions

Glucomannan 2,022

Individual Drug Interactions

The ingredients in Glucomannan from Konjack Root 1,995 mg interact with 2,022 drugs. Click any drug to see the details.

1 of the 1 ingredient in Glucomannan from Konjack Root 1,995 mg interact with drugs. Each result below shows which ingredient is responsible. Glucomannan

Each ingredient & the kinds of drugs it affects

For each ingredient in Glucomannan from Konjack Root 1,995 mg with known interactions, here are the types of medications it can affect. Open any type for the detail — or search your exact drug in the checker above.

Glucomannan1 drug type · 2,022 drugs

Oral Drugs

Theoretically, glucomannan may decrease absorption of drugs taken orally.
Due to its viscosity and bulking effects, there is concern that glucomannan can decrease the absorption of oral drugs. A small clinical study in healthy volunteers shows that taking glyburide 2.5 mg plus glucomannan 3.9 grams with breakfast reduces plasma levels of glyburide when compared with breakfast and glyburide alone. In addition, animal research demonstrates this effect on amoxicillin, but shows increased absorption of metronidazole. This mouse model also demonstrates that metronidazole elimination is prolonged, but amoxicillin elimination is enhanced by 38%; glucomannan may also affect the distribution of some drugs. To avoid changes in absorption, take glucomannan 30-60 minutes after taking oral drugs.

Likelihood Probable Evidence B
Glucomannan full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Glucomannan from Konjack Root 1,995 mg, from the product label.

Nature's Way

See all Nature's Way products
Name
Nature's Way Brands, LLC
City
Green Bay
State
WI
ZipCode
54311
Phone Number
1-800-962-8873
Web Address
naturesway.com
Pharmacist Counseling Corner

Glucomannan from Konjack Root 1,995 mg by Nature's Way: Common Questions

Does Glucomannan from Konjack Root 1,995 mg by Nature's Way interact with any medications?
Yes. Based on its ingredients, Glucomannan from Konjack Root 1,995 mg has a known interaction with 2,022 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Glucomannan from Konjack Root 1,995 mg contains a single active ingredient, and that one ingredient can interact with many different medications on its own. We check it against each medication and show the mechanism responsible.
Where does this information come from?
The product label data comes from the NIH Dietary Supplement Label Database (DSLD); the interaction data is built on the Natural Medicines database and reviewed by HelloPharmacist pharmacists.
Can I take Glucomannan with my diabetes or blood pressure medications?
Possibly, but you'll need to be strategic about timing. Glucomannan can lower how much of these drugs your body absorbs, which may reduce their effect. Talk with your doctor or pharmacist about spacing your doses several hours apart — for example, taking your medication in the morning and the supplement in the evening. Always take the capsule with a full glass of water.
What side effects might I notice?
Most people experience mild stomach issues: bloating, gas, nausea, or changes in bowel habits, especially if you take more than 3 grams daily. These usually settle as your body adjusts. Serious side effects like choking or intestinal blockage are rare but can happen if you swallow it dry or without enough water — never do that.
Will it help with my constipation?
Possibly. The evidence suggests glucomannan may help relieve constipation, but more research is still needed to be certain. If you try it, drink plenty of water — the fiber works by absorbing moisture, and without enough fluid it could actually make things worse.
Is it safe during pregnancy or breastfeeding?
There isn't enough reliable safety data either way. Talk with your doctor or pharmacist before using it while you're pregnant or nursing — they can help you decide what's right for your situation.
Can I take this as a powder instead of a capsule?
The safety data for this product is based on capsule form. Dry glucomannan powder can cause choking or blockage in your throat or intestines, so capsules with plenty of water are the safer choice.
What is glucomannan and where does it come from?
Glucomannan is a soluble fiber extracted from the root of the konjac plant. When you swallow it, it absorbs water and forms a thick gel in your digestive tract, which is how it helps bulk up stool and may affect cholesterol and blood sugar levels.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Not sure if Glucomannan from Konjack Root 1,995 mg is safe with your meds?

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Label information is sourced from the NIH Dietary Supplement Label Database and reflects the product version on file; always read your actual product label. This page is for education only and is not a substitute for professional medical advice. Confirm with your pharmacist or doctor before combining supplements and medications.

Glucomannan from Konjack Root 1,995 mg label
Go deeper

The Full Monographs Behind Glucomannan from Konjack Root 1,995 mg’s Ingredients

Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.

Herb & supplement monograph

Glucomannan

Interacts with 2,022 drugs

Glucomannan is a soluble fiber from the konjac root that swells into a gel in your stomach, which may help with mild weight loss, constipation, and modestly lowering cholesterol. It is gener...

Read the full Glucomannan monograph →
Sources

Sources & How We Checked

Glucomannan from Konjack Root 1,995 mg's label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

The 15 references behind this product’s interaction data

Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.

Glucomannan 15 references
  1. Henry DA, Mitchell AS, Aylward J, et al. Glucomannan and risk of oesophageal obstruction. Br Med J 1986;292:591-2. PubMed
  2. Shima K, Tanaka A, Ikegami H, et al. Effect of dietary fiber, glucomannan, on absorption of sulfonylurea in man. Horm Metab Res 1983;15:1-3. PubMed
  3. Villaverde, A. F., Benlloch, S., Berenguer, M., Miguel, Rayon J., Pina, R., and Berenguer, J. Acute hepatitis of cholestatic type possibly associated with the use of glucomannan (amorphophalus konjac). J Hepatol. 2004;41(6):1061-1062. PubMed
  4. Yoshida, M., Vanstone, C. A., Parsons, W. D., Zawistowski, J., and Jones, P. J. Effect of plant sterols and glucomannan on lipids in individuals with and without type II diabetes. Eur.J Clin Nutr. 2006;60(4):529-537. PubMed
  5. Wood, R. J., Fernandez, M. L., Sharman, M. J., Silvestre, R., Greene, C. M., Zern, T. L., Shrestha, S., Judelson, D. A., Gomez, A. L., Kraemer, W. J., and Volek, J. S. Effects of a carbohydrate-restricted diet with and without supplemental soluble fiber
  6. Vanderbeek, P. B., Fasano, C., O'Malley, G., and Hornstein, J. Esophageal obstruction from a hygroscopic pharmacobezoar containing glucomannan. Clin Toxicol.(Phila) 2007;45(1):80-82. PubMed
  7. Bernstein, J. A., Crandall, M. S., and Floyd, R. Respiratory sensitization of a food manufacturing worker to konjac glucomannan. J Asthma 2007;44(8):675-680. PubMed
  8. Shichijo, K., Kobayashi, Y., Fueki, R., Shimoyama, K., and Masaya, M. [2 cases of konjac bronchial asthma found outside the "konnyaku" producing district]. Arerugi 1969;18(2):97-100.
  9. Carabin IG, Lyon MR, Wood S, et al. Supplementation of the diet with the functional fiber PolyGlycoplex is well tolerated by healthy subjects in a clinical trial. Nutr J 2009;8:9. PubMed
  10. Lyon MR, Reichert RG. The effect of a novel viscous polysaccharide along with lifestyle changes on short-term weight loss and associated risk factors in overweight and obese adults: an observational retrospective clinical program analysis. Altern Med Rev
  11. Lyon M, Wood S, Pelletier X, et al. Effects of a 3-month supplementation with a novel soluble highly viscous polysaccharide on anthropometry and blood lipids in nondieting overweight or obese adults. J Hum Nutr Diet 2011;24(4):351-9. PubMed
  12. Han Y, Zhang L, Liu XQ, Zhao ZJ, Lv LX. Effect of glucomannan on functional constipation in children: a systematic review and meta-analysis of randomised controlled trials. Asia Pac J Clin Nutr 2017;26(3):471-7.
  13. Health Canada Safety Alert. Health Canada Advises Canadians that natural health products containing glucomannan may cause serious choking if used with insufficient fluid. January 29, 2010. Alert # RA-110003825. https://healthycanadians.gc.ca/recall-alert-
  14. Mortensen A, Aguilar F, Crebelli, et al. EFSA Panel on Food Additives and Nutrient Sources added to Food. Re-evaluation of konjac gum (E 425 i) and konjac glucomannan (E425 ii) as food additives. EFSA Journal 2017;15(6):4864.
  15. Zhang Y, Aldamarany WAS, Song G, et al. Influence of konjac glucomannan and its derivatives on the oral pharmacokinetics of antimicrobial agent in antibiotics cocktails: Keep vigilant on dietary fiber supplement. Int J Biol Macromol 2023;251:126306. PubMed

See these in context on the Glucomannan monograph →

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

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