I think there is plenty of positive support for many of the *racetams, though if you ask people on longevity forums, it seems like everyone has a different experience with the effects - basically, it does something useful or does nothing. After that, some said that certain combos of *racetams worked better. Therefore, I'd imagine that despite whatever further awesome insight we might get from the Dr., it probably still won't matter until your GF tries them to ascertain the effects. Once you know that, you'll be able to determine the most cost-effective solution.
I think it'd be fascinating if the Dr. was able to provide narrowed nootropic recommendations for desired attributes, such as:
Alertness
Focus
Memorization
Recall
Reasoning/Intelligence
Anti-Anxiety
Consider any anti-aging, well-being, or anti-oxidant properties a double-bonus!