Rehmannioside A is primarily used in traditional Chinese medicine for its therapeutic properties. It is often included in herbal formulations aimed at supporting kidney health and managing conditions related to kidney deficiency. Additionally, it is utilized for its potential anti-inflammatory and immune-modulating effects, making it a component in treatments for chronic inflammatory diseases. Research also explores its role in improving blood circulation and its application in managing symptoms of fatigue and weakness. Its use in modern pharmacology continues to be studied for broader therapeutic applications.