Creatine. There will be a few who disagree.
A few test boosters that I can't remember.
Oly dumbell handles.
I was hoping someone would say Cybergenics. I never bought them but I remember them being around.
A heap of supplements of course....
In regards to equipment - cant think of anything off the top of my head - when we opened the gym we were pretty carefull with what we bought - GHR is a fantastic bit of equipment if you know how to use it!
The only two things I can think of is 18 months of using No Bull Milk Powder sold as Protein Powder
The other is Kettle Bells, that fad lasted about 10 minutes for me before they hit eBay
Don't normally fall into fads and gimmicks, just training and lifting weights for me.
Liver tablets ?