tangential off topic swerve...
as far as natural ingredients go, it is quite easy to find entirely natural plants in their entirely natural habitat that could cause death even in relatively moderate dosages.
Natural bella donna tea? I seem to remember hearing that this is used for suicide in India.
This of course has nothing to do with the validity of your memory pills
which I know nothing about.
I would tend to agree with youngprer, though: Memory Optimizer, ImageStreaming, a bit of training and practice would seem like the most trustworthy source of a better memory!
Kosmik