I remember hearing a rumor about a year ago that some early batches of TRAC had a little "something extra" in the container. Kind of like Hot Stuff did years ago.
I worked for a chain of retail nutrition stores at the time. I can't say what was supposed to be in it for sure, but some of the guys at our warehouse were hoarding it for themselves and their friends because of this.
Like I said, it was a rumor I heard. I can't verify it or give lot #'s. My guess would be that if it was true, those batches are long gone.