You need to be REAL careful with bulk yohimbe. Even a small screw up in dose can be problematic, if not fatal. Unfortunately, I know this all too well. Took the phone call from the sister of a friend..
"Hi. It's Ang, John's sister. He's in the hospital and can't breathe on his own. Do you know what he took"? He eventually recovered, but it was close. Long story short, he screwed up his bulk Yohimbe dose and took too much.
Please exercise extreme caution. Trust me, you don't want to take that phone call..