Fiber supplements can help lower blood sugar levels in people with diabetes and improve certain digestive conditions such as irritable bowel syndrome and chronic constipation. So far, there is no evidence that long-term use of fiber supplements is harmful to the body. However, if you are taking fiber supplements, make sure to drink plenty of water or other fluids to avoid worsening constipation. Additionally, gradually introduce fiber into your diet to avoid problems like gas.
Furthermore, fiber supplements can reduce the absorption of certain medications, such as aspirin, warfarin, and carbamazepine. If you are taking these medications, it is best to temporarily stop using fiber supplements.