Source: EFSA Panel Opinion — Glucomannan — EFSA accepts a weight-management claim at 3 g/day (1 g ×3) taken with water before meals.
EFSA accepts 3 g/day (1 g before meals ×3) with water for weight management — must be taken with plenty of fluid.
A soluble fiber from konjac root that expands with water to promote fullness.
Absorbs water in the stomach to form a gel that slows digestion and blunts hunger.
Take with a full glass of water — dry capsules can swell and pose a choking/blockage risk. May cause bloating or gas, and can slow absorption of medications taken at the same time.
| Per serving | |
|---|---|
| Typical branded single-ingredient product | $0.42 |
| Bulk powder at the clinical dose (500g, $44.97) | $0.27 |
Buying bulk powder instead of a branded bottle saves about 35% per serving.
Bulk price: $44.97/500g →Educational only — not medical advice. Grades and clinical doses are computed from public labels against sourced research (citations on the main site); prices last verified 2026-07-21. Expensive Powder has no sponsors; bulk links may earn an affiliate commission, which never affects a grade. Talk to a clinician before starting any supplement.