Thanks for your speedy reply.
It is probably just me being paranoid. I will declare that i have taken these pills before the sample is taken and that will cover me even further i'd imagine.
I was just worried as previous versions of this brand had apparently contained ephedrine which is apparently banned and classed as an amphetamine (correct me if i'm wrong). I thought that this revised recipe may have something very similar and show up as a positive. You have taken a load off my mind and i really appreciate that. thank you