I got the arctic mint flavor and it's pretty good but I don't feel even slightly energized after 15 inhales, I just get a headache after thirty minutes or so. Not sure if it's a problem with my body's response to caffeine or if there just isn't that much caffeine in the diffuser. Other than that I guess it's pretty nice :) I just use it for the flavor now.
HELO Air Caffeine Diffuser - Arctic Mint
Artic mint is my fav for sure!
Works like magic
Works like a charm!