protein powder in my hand luggage attracted a bit of interest from security at OOL a few months back. Security bloke was a bit of a comedian and was “surprised” that my ETD swabs came back negative because “you look a bit like a terrorist” (so they can do jokes but we can’t?)

I think some powders have been viewed more suspiciously since the Etihad meat grinder plot of 2017 or so. I forget the exact rules though