Piper kadsura is a climbing vine native to East Asia. People in Japan and China have used it in traditional herbal practices for a long time. They usually take it as a dried stem extract, in capsules or as a decoction.
Modern science has not yet confirmed any specific health benefits. The evidence from clinical research is too thin to say what it does or does not do in the body. Some people still include it in traditional wellness routines, but no widely recognized effects are backed by current data.