Ceylon cinnamon (Cinnamomum verum) has a long history of use in traditional medicine systems, particularly in Ayurveda and traditional Chinese medicine. Within these traditions, cinnamon is often used to support digestive health, including the function of the small intestine. It is believed to stimulate digestive enzymes, reduce bloating, and help manage gastrointestinal discomfort. The traditional rationale is that cinnamon has warming and carminative properties, which can promote healthy digestion and alleviate symptoms such as gas and cramping that may be associated with small intestine imbalance.

However, while there is some scientific literature suggesting cinnamon can have antimicrobial, anti-inflammatory, and carminative effects, most modern research focuses on its impact on blood glucose and metabolic health rather than direct effects on the small intestine specifically. Studies do indicate that cinnamon extracts can inhibit certain pathogenic bacteria and may improve overall gut health, but evidence for targeted support of small intestine function is limited and indirect. Therefore, its use for small intestine support is primarily justified by tradition, and scientific validation remains modest.