Jujube (Ziziphus jujuba) has a long history of use in traditional Chinese medicine and other herbal systems. Traditionally, jujube is believed to have calming and adaptogenic properties, and it has often been used to alleviate stress, anxiety, and to support restful sleep. In these contexts, it is thought to help balance the body's stress response, which is mediated largely by the sympathetic nervous system. However, the idea that jujube specifically "supports the sympathetic nervous system" is rooted more in the broad traditional concept of balancing body systems (“Shen” or spirit calming) rather than direct scientific evidence of action on sympathetic nervous function. Scientific studies on jujube have focused on its sedative and anxiolytic effects, with some animal and in vitro research suggesting it may modulate neurotransmitters such as GABA and serotonin. These findings may indirectly relate to stress modulation, but direct, robust human studies linking jujube to sympathetic nervous system support are lacking. The evidence for its use in this context is therefore mostly traditional, with some low-level scientific support for its general calming and adaptogenic effects. Overall, while jujube is traditionally used for stress and relaxation, its direct role in sympathetic nervous system support remains insufficiently validated by modern research.