[u]Low-Carb Grow!:[/u] Tastes great and is high quality. A great food supplement that comes in handy on a regular basis. I've been using Grow! since it was first introduced back in the day. This is a staple in my diet.
[u]Surge:[/u] Awesome! Love the taste, and I can tell the difference from using it. I've also used this since it was first introduced. I hate going without it. This is a staple in my diet.
[u]HOT-ROX:[/u] The best fat burner I've ever used. But you must have your training and nutrition dialed in perfectly if you really want to see the potential. Otherwise, it works well to keep fat to a minimum when gaining. I use it off and on throughout the year depending on my goals.
[u]ZMA:[/u] Just like a multi-vitamin, I use this for "insurance" and for the wonderful and restful sleep as well as vivid dreams. This should be a staple for everyone. I've also used this since it was first introduced.
These are the only things I use on a regular basis and highly recommend to others, especially since two are food supplements, one is a vitamin/mineral, and the other is a great training-specific supplement.
I've also tried/used a lot of other Biotest products (M, Power Drive, Grow! bars) some of which are no longer around such as Androsol, Nandrosol, MD6, TRIBEX, MAG-10, etc.
I have no interest in many other Biostest supplements because I would rather spend my money on stuff that helps with one of the most important aspects besides my training: Nutrition.