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3Medicinal

Glucomannan

Also sold as Konjac root fibre, konjac

A highly absorbent fibre used for fullness and cholesterol — small effects on weight, and a real choking risk in tablet form.

TrustedSupp Tier System™ · Tier 3Take as a defined course

Evidence strength

32/100Weak
WEAKLIMITEDMODERATESTRONGVERY STRONG

What the evidence supports: LDL cholesterol reduction and small, inconsistent effects on weight.

This scores how well-supported the claim above is — not how much benefit you personally would get. A high score on a narrow claim does not extend to everything the product is marketed for.

How long to take it

Course-based alongside diet changes.

Who it's actually for

People wanting a fibre that increases fullness, who can take it safely with water.

Safe upper limit

Unverified
No formal upper limit; 2–4 g daily, always with plenty of water
Glucomannan swells dramatically. Tablets taken with too little water have caused choking and oesophageal blockage — powders and capsules with a full glass of water are safer. It slows absorption of medications taken at the same time.
No source or citation attached yet.

Interactions to know about

Run your full list through the interaction check.

Practical notes

  • Always take with a full glass of water; avoid tablets if you have any swallowing difficulty.
  • Separate from all medications by at least 1–2 hours.
  • Weight effects in trials are small.