Psyillium (Metamucil, Konsil) and methylcellulose (Citrucel) are examples of this type.

Metamucil: Fruit-flavored powder that dissolves in water is what most people associate with this brand, but Metamucil also makes wafers and tablets full of fiber.

In such cases, these people may increase their fiber intake using a fiber supplement such as Metamucil or Citrucel.

Metamucil Products - This long-standing company makes fiber supplements, powders, and wafers for those needing a fiber boost.