Methylcellulose (Citrucel) It differs from psyllium because it is non-fermentable, meaning that it’s less likely to contribute to bloating and gas.Click to see full answer. Consequently, does benefiber cause gas?Benefiber and Metamucil can cause similar side effects, such as stomach cramping and gas. In rare cases, these supplements can cause serious side effects. These can include gastrointestinal (GI) obstructions.Subsequently, question is, what are the side effects of taking fiber supplements? Too much fiber can cause: bloating. abdominal pain. flatulence. loose stools or diarrhea. constipation. temporary weight gain. intestinal blockage in people with Crohn’s disease. reduced blood sugar levels, which is important to know if you have diabetes. Regarding this, which fiber supplement is best? Best Overall: NOW Psyllium Husk Powder. Best Budget: Equate Daily Fiber Powder. Best for Diarrhea: Heather’s Tummy Fiber. Best for Constipation: Garden of Life RAW Fiber for Constipation Relief. Best for High Cholesterol: Benefiber Fiber Supplement. Best Gummies: VitaFusion Fiber Well Fit. Can Metamucil cause gas?Bloating is a common side-effect of Metamucil. For new users, start by taking a small amount of Metamucil and then gradually increase to the recommended dosage to allow your system to adjust and to minimize gas and bloating. If you have tried this and you still experience bloating, talk to your doctor.