[varispeed]

I've been trying various Mates and they do nothing for me, in fact often I get sluggish and sleepy.

I have a similar effect after coffee, but if I drink like 4 espressos at once I get a slight bump of focus. When I get past 8 espresso my hands get a bit shaky and again I feel like I need to go to sleep.

I guess caffeine is not for me, however I still drink it, as it helps with migraines and ADHD.