Acarbose blocks the enzymes that break down complex carbs into glucose, slowing absorption from the gut. Used for diabetes; in longevity-curious circles, used for blunting post-meal glucose excursions and reducing insulin demand.
Dose: 25-100mg with high-carb meals.
Caveats: Significant flatulence (fermentation in the colon). Liver enzymes need periodic checking. Not for IBD.