Glucomannan is an appetite suppressant that swells in the stomach to create a feeling of fullness. In tablet form, Glucomannan is permanently banned due to the hazards associated with choking on the tablet while swallowing. Glucomannan is still widely available in capsule and powder forms, which do not pose a choking hazard to the user.
The permanent ban on Glucomannan in tablet form was declared on 22 December 1986. This page includes information on hazards and how to comply with the ban.