oat bran

Oat bran is the outer fibrous layer of the oat grain (Avena sativa), separated during the milling and processing of whole oats. It is removed as a byproduct during steel-cut oat and rolled oat production, consisting primarily of the bran and germ layers that contain the majority of the grain's fiber, minerals, and lipids.

Oat bran is characterized by its tan to golden-brown color, fine powdery or flaked texture, and mild, slightly nutty flavor. The ingredient contains beta-glucans, a soluble fiber known for its cholesterol-lowering properties, along with significant concentrations of B vitamins, minerals (particularly manganese and phosphorus), and plant compounds. It differs from whole oat groats in its concentrated nutrient profile and higher fiber density relative to its weight.

Oat bran is employed primarily as a nutritional fortification ingredient rather than a standalone grain. It is commonly incorporated into breakfast cereals, granolas, and baked goods including muffins, bread, and cookies to increase dietary fiber content and nutritional value. In contemporary health-conscious cooking, oat bran is often mixed into smoothies, yogurt, and oatmeal to boost fiber intake, or used as a partial flour substitute in baked goods at ratios of 10-25% by weight. The ingredient's thickening capacity due to its high water-absorption rate makes it useful in porridges and as a binder in gluten-free baking and plant-based meat alternatives.