The vagus nerve is the longest cranial nerve in the body and plays a crucial role in regulating many bodily functions, including heart rate, digestion, and mood. Vagus nerve stimulation (VNS) is a medical treatment that involves delivering electrical impulses to the vagus nerve to help alleviate symptoms of various health conditions. https://www.parasym.co/parasym-device-transcutaneous-vagus-nerve-stimulation.html