By Dr. Liji Thomas, MD Reviewed by Lauren Hardaker Jun 14 2026 A low-viscosity oat β-glucan supplement showed early signs of improving digestive comfort and glucose regulation, pointing to a potentially better-tolerated way to close the fiber gap. Study: Short-chain oat fiber improves gastrointestinal tolerance and regulates glucose metabolism: a two-week open-label study in healthy adults . Image Credit: Food Impressions / Shuttersto ck A recently published pilot study in the journal