Which substance is commonly used as a laxative and is derived from psyllium?

The substance commonly used as a laxative and derived from psyllium is mucilage. Psyllium, which comes from the seeds of the Plantago ovata plant, contains a significant amount of soluble fiber, primarily in the form of mucilage. This viscous gel-like substance can absorb water and expand in the digestive tract, which helps to increase stool bulk and promote regular bowel movements, making it an effective laxative.

Mucilage has beneficial properties for digestive health because it can help to soften stools and ease their passage. Its ability to hold moisture plays a critical role in alleviating constipation, which is why it is a favored ingredient in many fiber supplements and laxative products.

The other substances listed, including cellulose, lignin, and pectin, do not possess the same laxative effects attributed to mucilage from psyllium. Cellulose and lignin, while they are both forms of dietary fiber, largely contribute to the structure of plant cell walls and do not absorb water in the same way. Pectin, although it can gel and thicken, primarily is known for its role as a stabilizer in food rather than as a laxative. Thus, the properties of mucilage make it the correct choice for a substance used