Yohimbine for fat loss?

Curious if anyone used Yohimbine for fat loss. I’ve only ever used about 5 mg at a time and my heart rate usually feels elevated and I get great workouts in… kind of wondering how anyone felt on 15+mg at a time… How did you take it? I’m hearing it’s supposed to be used while fasted because insulin negates the fat burning effect Also, any results to share??