Scimitar bean (Canavalia gladiata), also known as sword bean, has a history of use in traditional Chinese medicine (TCM), where it is called Dao Dou. In TCM, it is classified as an herb that "tonifies the spleen and dispels dampness," which in traditional theory is closely associated with the function of the digestive system, including the small intestine. Practitioners use it to address symptoms such as poor digestion, diarrhea, and abdominal distension, suggesting its role in supporting the gastrointestinal tract.

There is, however, limited scientific research specifically evaluating the effects of Scimitar bean on the human small intestine. Most available studies focus on its general nutritional content (high in protein and fiber) and potential antioxidant or antimicrobial properties, but do not provide direct evidence for its efficacy in supporting small intestine health or function. No clinical trials or robust animal studies specifically link Scimitar bean to measurable improvements in small intestinal physiology or related disorders.

In summary, the use of Scimitar bean for supporting the small intestine is based on traditional usage and theoretical frameworks rather than modern scientific validation. Its evidence rating is modest due to the lack of targeted research, but its longstanding role in herbal medicine warrants recognition of its traditional relevance.