Concentrated oat β-glucan, a fermentable fiber, lowers serum cholesterol in hypercholesterolemic adults in a randomized controlled trial

This six-week randomized controlled trial assigned 75 adults with elevated cholesterol to receive either 6 grams per day of concentrated oat beta-glucan or a dextrose control. Blood lipids and other cardiovascular-risk markers were measured at baseline and during follow-up, and the oat preparation was also assessed in a separate laboratory fermentation model. The trial reported reductions in total and LDL cholesterol with concentrated oat beta-glucan. The intervention was cereal-derived oat fiber, not Aureobasidium beta-glucan, and the study does not support claims about AP-glucan, bile-acid excretion, or changes in beneficial gut bacteria that were not directly demonstrated in the clinical comparison.