Yes
“Vagus” is a Latin word meaning “wandering”, and the nerves with that name (one on the right, one on the left) meander around the body, connecting the brain to the heart, the lungs, the gut and beyond. They’re known to play a significant role in putting us in a state of rest and digest (as opposed to fight or flight), and studies have shown that vagus nerve stimulation (VNS) can calm and regulate some bodily functions. (The potential cardiac side effects of stimulating the right means that VNS concentrates almost exclusively on the left.)
I started to feel I had more energy just after the first week
Yōjō user Andrea
Most notably, VNS implants have long been used by doctors to treat epilepsy. But the vagus nerve can also be stimulated via the skin, usually in or around the left ear, using small electrical pulses that give a tingling sensation. A number of devices on the market claim to do this safely, and some have been shown to have positive effects for specific conditions. One, GammaCore, is available on the NHS to treat cluster headaches via neck-based VNS. Another, made by German firm tVNS Technologies, is being used in a £2mn study (Triceps) led nationally by Sheffield Teaching Hospitals NHS Foundation Trust and the University of Sheffield into treating arm weakness following a stroke, funded by the NIHR Efficacy and Mechanism Evaluation board, the Association of British Neurologists and the Stroke Association.
