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Psyllium husk is almost entirely soluble fiber, which may soften stool and help with bowel regularity. Chia seeds provide both soluble and insoluble fiber, plus protein, omega-3 fats, and minerals.

Both inulin and psyllium are forms of soluble fiber that have gut health benefits. Inulin is a fermentable fiber found in foods and supplements, and psyllium is a non-fermented fiber supplement.