Nei guan

Nei guan (P6, Chinese: 内关) is an acupoint, a point of the skin that is stimulated, with various techniques, in the practice of acupuncture. It is located on the wrist, along the pericardium meridian.

Therapeutic uses and scientific validation
The Cochrane Collaboration, a group of evidence-based medicine (EBM) reviewers, reviewed the use of Nei guan (Acupoint P6) for nausea and vomiting, and found it to be effective for reducing post-operative nausea, but not vomiting. The Cochrane review included various means of stimulating P6, including acupuncture, electro-acupuncture, transcutaneous nerve stimulation, laser stimulation, acustimulation device and acupressure; it did not comment on whether one or more forms of stimulation were more effective. EBM reviewer Bandolier said that P6 acupressure in two studies showed 52% of patients with control having a success, compared with 75% with P6 acupressure. One author of an article published in the Scientific Review of Alternative Medicine disagreed.