Ive never found Piracetam to potentiate anything and ive combined it with quite a few things.
Potentiation is hard to qualify.
I have noticed Piracetam has seemed to change the nature of the following drugs:
amphetamines - prolonged peak
Cannabis - more lucid thought process
LSD - unusually edgy trip
MDMA - seemed potentiated
Ketamine - makes it super weak
Alcohol - I get drunk quicker
Currently my supplements are,
Piracetam 1500-2500mg day, taken before work
Choline Bitartrate 1500-2500mg day, same time
Vitamin D @ 5000iu/day
Valerian, Passionflower, Hops, Chamomile, Catnip tincture before bed
Melatonin 1mg before bed
I don't find this dose of Piracetam to be excessive although it might be for some people. If I felt any physical stimulation I would reduce the dose, but all I get is mental wakefulness and endurance through the work day. I can sleep on it.