Red-Rooted Sage (Salvia miltiorrhiza), also known as Danshen, has a long history of use in traditional Chinese medicine (TCM). In TCM, Danshen is often prescribed for cardiovascular issues and to improve blood circulation, but it has also been used as part of herbal formulas aimed at alleviating digestive problems, including acid indigestion and dyspepsia. The rationale in traditional use is often tied to its purported ability to "move blood" and "dispel stasis," which practitioners believe can help harmonize stomach function and relieve symptoms like bloating and discomfort.

However, scientific validation for its direct efficacy in treating or supporting acid indigestion is limited. Most modern research on Red-Rooted Sage focuses on its cardiovascular and anti-inflammatory effects, and there are very few clinical studies specifically evaluating its impact on acid indigestion or related gastrointestinal disorders. Some preclinical studies suggest antioxidant and anti-inflammatory properties that could theoretically benefit gastric mucosa, but these findings are not directly linked to relief from acid indigestion in humans.

In summary, Red-Rooted Sage is used traditionally for digestive complaints within certain herbal frameworks, but there is only weak evidence (primarily historical and anecdotal) supporting its specific use for acid indigestion, with scientific studies largely lacking.