Sunfiber (partially hydrolysed guar gum)

Tier 2 — promising · Gut · IBS · Prebiotic

A gentle prebiotic fiber that helps with both constipation and diarrhea. A 2024 review of 12 trials found it significantly improves IBS symptoms of both types, increases beneficial gut bacteria, and normalizes stool form. Unlike many fibers, it is safe for low-FODMAP diets and dissolves completely in water without altering taste or texture.

Dose: 5–7 g/day dissolved in water or food; well-tolerated even in FODMAP-sensitive patients