Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Agar, a gelatinous substance derived from red algae, is traditionally used as a laxative due to its high fiber content. Scientifically, agar acts as a bulk-forming laxative. When ingested, it absorbs water in the gut, swells, and increases the volume of intestinal contents. This stimulates peristalsis and facilitates bowel movements. Several clinical studies, primarily in adults, support the efficacy of agar as a bulk laxative. For example, a review in the journal Alimentary Pharmacology & Therapeutics (2007) notes that agar, like other bulk-forming agents, can be effective in managing chronic constipation. Evidence specific to children is limited, but agar has been used in pediatric populations, particularly in Asian countries, for this purpose. The World Health Organization’s Model List of Essential Medicines for Children lists bulk-forming agents as a category for constipation treatment, though agar itself is not specifically named. Safety concerns are minimal when agar is administered with adequate fluids; however, insufficient hydration can lead to intestinal obstruction. In summary, while there is scientific rationale and some evidence for the use of agar in treating constipation, especially as a bulk-forming laxative, high-quality pediatric-specific clinical trials are lacking. Therefore, the evidence is moderate (3/5) and its use in children should be guided by clinical judgment and appropriate dosing.

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