Fiber
Konjac Root Extract (Amorphophallus konjac)
Also known as: glucomannan, konjac glucomannan, konjac flour, elephant foot yam
Konjac root extract is a soluble dietary fiber derived from the konjac plant, primarily composed of glucomannan, which absorbs water and forms a viscous gel in the digestive tract. Evidence supports its use for promoting digestive health, blood sugar management, and modest weight loss support.
Last reviewed June 2026 · Evidence graded from peer-reviewed research, not editorial opinion. Educational only — not medical advice.
Common questions
How much Konjac Root Extract (Amorphophallus konjac) should I take?
The typical range is 3-15 g daily (1.5-5 g per serving, 2-3 times daily). Safe for long-term daily use; effects on bowel regularity typically observed within 3-7 days
When should I take Konjac Root Extract (Amorphophallus konjac)?
Take with meals or separate doses throughout the day. Must be taken with at least 8 oz (240 ml) of water or liquid; can be mixed into beverages.
Which form of Konjac Root Extract (Amorphophallus konjac) is best?
Powder. Other forms in the catalog: Capsules, Tablets.
Is Konjac Root Extract (Amorphophallus konjac) safe?
Commonly reported: Bloating and gas (dose-dependent, often transient), Abdominal discomfort or cramping, Constipation if inadequate water intake.
Which Konjac Root Extract (Amorphophallus konjac) supplement scores highest?
Nutricost Glucomannan Capsules, at 71/100. Scored on dose accuracy, form, label transparency and third-party testing — no brand pays to be listed or ranked.
Primary uses
- Digestive health and regularity
- Blood sugar management
- Cholesterol support
- Weight management support
- Satiety and appetite control
How it works
- High-viscosity soluble fiber that absorbs water and slows gastric emptying
- Increases fecal bulk and promotes bowel regularity
- Reduces glycemic response by slowing carbohydrate absorption
- May lower cholesterol by binding bile acids
- Promotes satiety through gastric distension
Dosage
- Typical range
- 3-15 g daily (1.5-5 g per serving, 2-3 times daily)
- Timing
- Take with meals or separate doses throughout the day
- With food
- Must be taken with at least 8 oz (240 ml) of water or liquid; can be mixed into beverages
- Duration
- Safe for long-term daily use; effects on bowel regularity typically observed within 3-7 days
- Special populations
- Start with lower doses (3-5 g daily) and increase gradually to minimize gas and bloating; persons with difficulty swallowing should avoid or use with caution; inadequate fluid intake increases choking and obstruction risk
Forms
- Powder· 70/100
- Capsules· 70/100
- Tablets· 70/100
Safety
Common side effects
- Bloating and gas (dose-dependent, often transient)
- Abdominal discomfort or cramping
- Constipation if inadequate water intake
Contraindications
- Dysphagia (difficulty swallowing)
- Esophageal strictures or obstruction
- Bowel obstruction or ileus
- Acute abdominal conditions
- Severe dehydration or inadequate fluid intake
Products containing Konjac Root Extract (Amorphophallus konjac)
Top-scoring supplements in our catalog that list Konjac Root Extract (Amorphophallus konjac) on the label. Each product is graded on Formulate's ingredient-level rubric — dose accuracy, form, transparency, and third-party testing.
Evidence notes
Multiple RCTs and systematic reviews support efficacy for bowel regularity, modest glycemic control, and cholesterol reduction. Evidence for weight loss is moderate but present. Well-established safety profile with decades of use in food applications.
Grade B: Some human trials support key claims; further confirmation needed.
Related in Fiber
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Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider. Individual needs and risks vary — consult a professional before starting, stopping, or combining supplements, especially if you are pregnant or nursing, taking medication, or managing a health condition.