i'm using yohimbine hcl right now... can't speak to much for its effects to be totally honest, as i haven't been scientific about its use and results. it was cheap and i threw it in my cutting cycle (started with ecy now on albuterol) just because i heard it worked ok.
i don't take green tea extract as a supplement, but have switched my daily coffee intake with brewed green tea. that for sure has helped with the water retention i got with coffee.