Natural Factors PGX SATISFAST ORGANIC VEGAN PROTEIN BAR - Dark Chocolate Coconut - These bars reduce food cravings, prolong fullness, and are a perfect companion to your workout regime. PGX (PolyGlycopleX) is a patented super fiber complex made up of 100% natural, highly viscous polysaccharides. When taken with meals, PGX expands in the stomach over a 30-minute (or longer) timeframe. This process creates a feeling of fullness by absorbing water and filling the stomach while slowing digestion. This slows the absorption of carbohydrates, effectively lowering the glycemic index of the food.