Bulk-forming laxatives aren’t digested; instead, the fiber they contain allows you to retain more fluid—that’s why you need to be sure that if you use them, you increase your consumption of fluids. The water absorption produces a softer, bulkier stool. The bulky size stimulates the intestinal muscles to contract, causing everything to move along, leading to an easier bowel movement. It can take from twelve to thirty-six hours for bulk-forming laxatives to produce results, so they do not provide immediate relief from constipation—they are best used for ongoing digestive health. Examples include
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