Andrew Huberman· PhD
But what I just described with combining all of those compounds, Alpha-GPC, L-tyrosine, phenylethylamine and caffeine, that's a fairly rare occurrence that I'll combine all four and really only under conditions in which I have to do an intensely challenging about of mental or physical work. I would say the frequency at which I combine all four of those things is probably about once every two weeks, and typically more like once a month, again being careful to do that in the early part of the day, certainly before the noon hour, so that I am in no way going to disrupt my sleep.