Yeah, pretty much. It amps your adrenaline a bit, wakes the system up for fight or flight....remember, people used to use them for waking up fainting or passed out people--"smelling salts". Problem is if you sniff too large an amount you can toast some of your olfactory receptors, and it can do more harm than good to your system as a whole if you get overload--that's why I'm interested in how much a capsule of ammonia has in it.
I've never bought them and I'd like to get a jolt out of it, but not enough to put me over the top. I figure that caps used competitively must have about the right amount from feedback from lifters or whatever.