Real Trenabol Depot 100 looks like this:
http://www.britishdragon.com/images/...t100_small.jpg
Its hard to see on the pic, but the oil is almost red in color.
The fake will have light colored oil, will NOT have the top with Trenabol 100 written on it, also the rubber stopper on the fake is grey, and green on the original (it also has the BD logo on it).