I tried Wenxin Keli for about 5-6 weeks back in August-Sept.
It worked - pretty much eliminated my PVC's.
Then after stopping WK, the PVC's remained low for a month or so, but they eventually came back.
I am going to try it again, and see if I can find the lowest "dose" possible (and frequency) that works for me.
There are no studies that have evaluated long term use. I might be the test dummy.
Appreciate any one else's experiences.
FYI I am a 63 y/o male - have had PVC's for ~6 years. Frequency bounces around. have good days and bad days. Interestingly, The highest frequency occurs when I sleep (laying down on my side).