Kirkland Signature Psyllium Fiber 400ghis product is rich in natural mucilage (hemicelluloses), which increases fecal bulk. Hemicelluloses are indigestible by human digestive enzymes. Due to their high water absorbing capacity, they hydrate and form an emollient gel that exerts a mechanical action on the intestinal walls. This causes a distension stimulus, triggering a reflex that promotes peristalsis, normalizing intestinal transit, and thus facilitating the evacuation of soft, hydrated