Subtotal $0.00
Shop Now
Wheat bran is the outer layer of the wheat kernel that is separated out when white flour is milled. It is one of the most concentrated fiber foods in the USDA database: one ounce of crude wheat bran has about 61 calories and 12 grams of fiber, which is 43% of the Daily Value, plus a large share of magnesium and manganese. This guide covers wheat bran nutrition, what kind of fiber it supplies and what trials show, wheat bran vs oat bran, the phytate question, gluten, and practical ways to add it to food without upsetting your stomach.
Peptide Labs does not sell wheat bran. This article is general food information, not medical advice; if you have celiac disease, a wheat allergy, a bowel condition or new changes in bowel habits, talk with your clinician before changing your fiber intake.
Key Takeaways
- Wheat bran is the outer layer of the wheat kernel; white flour has most of it removed.
- USDA lists about 12 grams of fiber in one ounce of crude wheat bran, far more than oat bran by weight.
- MedlinePlus groups wheat bran with insoluble fiber, the kind that adds bulk to stool.
- A Kellogg-funded review of 65 trials found wheat fiber, mostly wheat bran, improved measures of bowel function.
- Phytate in bran binds some zinc and iron, but in a varied diet the effect is usually modest.
- Wheat bran contains gluten; add it gradually with plenty of fluids.
What wheat bran is
A wheat kernel is made of the bran, the starchy endosperm and the germ. White flour is made by grinding and sifting the grain, which removes most of the bran and germ, while federal standards for whole wheat flour keep all three parts in their natural proportions. Wheat bran sold on its own is the milled outer layers, usually in a flaky, light brown form, and it is also the base of many bran cereals. The inner embryo is covered in our companion guide to wheat germ, and the flour itself in our whole wheat flour guide.
Wheat bran nutrition
The table compares USDA FoodData Central SR Legacy values per 100 grams so foods of different density can be lined up fairly. Wheat bran stands out for fiber, magnesium, iron and zinc, while white flour has the least fiber; its iron comes largely from enrichment.
| Per 100 g (USDA SR Legacy) | Calories | Fiber | Protein | Magnesium | Iron | Zinc |
|---|---|---|---|---|---|---|
| Wheat bran, crude (FDC 169722) | 216 | 42.8 g | 15.6 g | 611 mg | 10.6 mg | 7.3 mg |
| Oat bran, raw (FDC 168872) | 246 | 15.4 g | 17.3 g | 235 mg | 5.4 mg | 3.1 mg |
| Whole-grain wheat flour (FDC 168893) | 340 | 10.7 g | 13.2 g | 137 mg | 3.6 mg | 2.6 mg |
| White flour, enriched (FDC 168894) | 364 | 2.7 g | 10.3 g | 22 mg | 4.6 mg | 0.7 mg |
Per 1-ounce portion, USDA data give crude wheat bran about 12.1 grams of fiber (43% DV), 173 milligrams of magnesium (41% DV), 3.3 milligrams of manganese (142% DV), 22 micrograms of selenium (40% DV), 3.9 milligrams of niacin (24% DV) and 3.0 milligrams of iron (17% DV), with only 1.2 grams of fat. Because bran is light and fluffy, a cup weighs only about 58 grams in USDA data. For other fiber-dense foods, see our high fiber foods list.
Insoluble fiber and what the research shows
MedlinePlus explains that soluble fiber attracts water and turns to gel, while insoluble fiber does not dissolve and adds bulk, and it names wheat bran as a source of insoluble fiber. USDA SR Legacy does not report a soluble and insoluble split for wheat bran, so no exact percentage is given here. The difference between the two types is explained in our soluble fiber guide.
The largest summary of trials is a 2015 systematic review by de Vries and colleagues covering 65 intervention studies in generally healthy people. Each extra gram of wheat fiber per day was linked with roughly 3.7 grams more daily stool weight and a small rise in stool frequency, and transit time shortened in people whose starting transit time was longer than 48 hours. The authors concluded that wheat fiber, predominately wheat bran fiber, improves measures of bowel function. The review was funded by Kellogg Company, and the authors received fees from or hold a chair funded by that company. Our fiber for constipation guide covers how bran compares with other fibers, and the Dietary Guidelines for Americans list dietary fiber as a dietary component of public health concern because most people fall short; see how much fiber per day for the reference values.
How wheat bran compares with the bran of oats
The wheat bran vs oat bran question mostly comes down to fiber type and amount. By weight, USDA data show wheat bran with nearly three times the fiber of raw oat bran, along with more magnesium, iron and zinc. Oat bran has a little more protein and fat. MedlinePlus lists oat bran with soluble, gel-forming fiber and wheat bran with insoluble, bulking fiber, so the two behave differently in the gut. NIDDK says most people with celiac disease can safely eat moderate amounts of oats that are gluten-free; our oats guide explains the gluten and label details.
Phytate and mineral absorption
Wheat bran is rich in minerals, but not all of them are absorbed. The NIH Office of Dietary Supplements explains that phytates, the storage form of phosphorus in plants, bind some zinc in the intestine and inhibit its absorption, and that zinc absorption from food ranges from 5% to more than 50% depending on how much phytate a diet contains. ODS also notes that phytate in grains and beans reduces absorption of nonheme iron, while vitamin C, meat, poultry and seafood in the same meal improve it. For calcium, ODS says that when people eat many different types of foods, interactions with phytic acid probably have little or no nutritional consequence. Our guides to foods high in zinc and foods high in iron cover absorption in more detail.
Gluten and who should skip wheat bran
Wheat bran comes from wheat, so it contains gluten. NIDDK lists wheat as a gluten grain, FDA lists wheat as a major food allergen, and FDA’s gluten-free rule does not allow a gluten-free label on a food with a wheat ingredient that has not been processed to remove gluten. People with celiac disease or a wheat allergy should avoid it; see foods with gluten for other sources. If your clinician has advised a lower-fiber diet for any reason, ask before adding bran.
Adding wheat bran to food
- Go slowly: MedlinePlus notes that a large amount of fiber in a short time can cause gas, bloating and cramps, and that adding fiber gradually helps.
- Drink fluids: MedlinePlus advises plenty of fluids when eating more fiber.
- Mix it in: stir bran into hot cereal, yogurt, muffin batter, meatloaf or bread dough.
- Read cereal labels: bran cereals vary in fiber, sugar and sodium, so compare the Nutrition Facts panels.
- Gas or bloating: see our fiber side effects guide for common reactions and when to call a clinician.
Frequently Asked Questions
Is wheat bran soluble or insoluble fiber?
MedlinePlus lists wheat bran as a source of insoluble fiber, the kind that adds bulk rather than forming a gel.
How much fiber is in wheat bran?
USDA lists about 12.1 grams of fiber per ounce of crude wheat bran, or 42.8 grams per 100 grams.
Is wheat bran gluten-free?
No. It comes from wheat, which NIDDK lists as a gluten grain and FDA lists as a major food allergen.
Which has more fiber, wheat bran or oat bran?
Wheat bran. By weight, USDA data show nearly three times as much fiber in wheat bran as in raw oat bran, though oat bran’s fiber is more of the soluble, gel-forming type.
Does wheat bran block mineral absorption?
Phytate in bran binds some zinc and iron and lowers how much is absorbed. ODS notes that in a varied diet the effect on calcium probably has little or no nutritional consequence.
Is wheat bran the same as whole wheat?
No. Wheat bran is only the outer layers of the kernel; whole wheat foods include the bran, germ and endosperm together.
Peptide Labs is a supplement store and does not sell wheat bran. Questions about a label? Contact us or read our Buyer’s Guide. Food comes first; follow the label and ask a healthcare provider before starting a supplement, especially if you take medicines, are pregnant or have a food allergy. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Last reviewed October 2026.
Related guides: Wheat Germ Benefits and Nutrition: Storage and Gluten Facts, High Fiber Foods: USDA List of Fruits, Vegetables, Beans and Grains, Fiber for Constipation: What the Evidence Says, How Long It Takes and Natural Laxative Foods.