Dude, too bad about your experience with Biotest, but mine have been great! Androsol and Nandrosol were good, but I gotta tell you, I'm on day 11 of a two week Mag-10 cycle, and I'm up 7 pounds of muscle as well as experiencing increased strength and endurance gains in all of the "big" lifts.
I'm also 45 years old, and I sure as hell can distinguish a placebo effect versus the real deal. I've been able to do four "two-a-days" so far, and recovery has been phenomenal despite the fact I'm using a single dose per day.
I'm sharing this with those of you who have an open mind, or are just plain curious about Biotest/mag-10. However, for anyone who wants to "flame" me or accuse me of being a shill for Biotest, be my guest - I'm simply telling you about my experience, and I really don't give a damn whether you believe me or not.