Protafloc tablets are a tabletted carrageenan product which is added to the wort in the kettle to enhance protein removal as the wort cools. The active ingredient in Protafloc tablets is a polysaccharide called carrageenan which is derived from seaweed. Carrageenan in solution is
negatively charged, owing to the sulphate groups along the polysaccharide backbone. It is these charged sites which interact with wort proteins.