Pea fiber is a dietary fiber derived from the hulls of peas (Pisum sativum). Its primary role in supporting the rectum and the broader lower gastrointestinal system is through its well-established effects on bowel regularity. Dietary fiber, including that from peas, increases stool bulk and water content, which can facilitate easier and more regular defecation. This can help prevent constipation, a major risk factor for rectal discomfort, hemorrhoids, and other anorectal disorders.

Multiple scientific studies have demonstrated that pea fiber, which contains both insoluble and soluble fibers, can improve stool frequency and consistency. For example, research published in Food & Function (2017) noted that pea fiber supplementation improved bowel movement frequency and stool form in constipated individuals. Another study in the Journal of Food Science (2015) found that pea fiber increased fecal bulk in healthy adults.

While most studies focus on general gastrointestinal and colon health rather than the rectum specifically, the benefits of increased fiber intake naturally extend to the rectum by reducing straining and contact time of waste with the rectal mucosa. Therefore, the use of pea fiber for rectal support is scientifically justified, although direct research on isolated rectal outcomes is limited.