I have a couple PWO's (though I dont enjoy that stim-feel). However, I train 4-5 days at 5:30 AM.
(Im also 60 fucking yrs old and still train heavy Powerlifting).
BUT, I do not use what they tell you to use. The scoops can be like 10 grams. (I have "CHEMIX" right now).
I use a 3 gram scoop and it gives me a light boost, nothing crazy. Learn how to use stuff, do it yourself, and there are no issues.
(Their dose for Chemix is 9 grams) so I'm only using a 3rd and its a nice little boost...
Nothing is really bad for you if you know what you are doing and use it wisely...
("Do I drink 2 nips of vodka with some OJ, or do I guzzle a gallon)... You get it...