Yerba Prima Psyllium Whole Husks, 12-Ounce Doctors recommend Psyllium Husks fiber for people eating low carb diets. Psyllium husks are the strongest natural dietary fiber for promoting regularity and supporting heart health. For best results, use daily as long as desired. Yerba Prima Psyllium Husks are gluten free, with no added sweeteners, colors or additives.