Do I need a fiber supplement?

Maybe, and it is worth understanding before buying. When appetite and food intake are low, fiber is easy to under-eat, and a supplement or a fiber-forward shake is one way to close the gap — soluble fibers like psyllium and prebiotics like inulin are the common ones. Two factual notes: take fiber with adequate water, and introduce it gradually, because ramping up fast (prebiotics especially) is a frequent cause of gas. We report grams and type from the label and keep it factual. Whether you need supplemental fiber, and how much, is a general-diet question for your clinician.