Red Sage (Salvia miltiorrhiza), also known as Danshen, has a longstanding history of use in Traditional Chinese Medicine (TCM) for supporting cardiovascular health, particularly with respect to the microcirculation and capillaries. Modern scientific studies have investigated its effects, focusing on the active compounds such as tanshinones and salvianolic acids. Research indicates that extracts of Red Sage can improve microvascular circulation, protect endothelial cells, and reduce inflammation and oxidative stress within blood vessels.

Several animal studies and clinical trials suggest that Red Sage may enhance capillary health by preventing capillary leakage, reducing abnormal clot formation, and improving blood flow. For example, a 2017 review published in Frontiers in Pharmacology highlighted Red Sage’s ability to ameliorate microcirculatory disturbances in cardiovascular diseases. Additionally, the compound salvianolic acid B has demonstrated protective effects on endothelial cells, which form the lining of capillaries, thereby supporting their integrity and function.

While most clinical trials have focused on broader cardiovascular outcomes (such as angina or stroke), the improvements in endothelial function and microcirculation are relevant to capillary health. Thus, the use of Red Sage for supporting the capillaries is backed by both traditional usage and increasing scientific validation, with evidence rated at 4 due to promising but not yet definitive large-scale clinical trials.