A tiny vial of peppermint clove oil. I struggle with sleepiness and lack of focus so after I’ve had an inadvisable amount of caffeine and am still not functional, I dab a bit right under my nostrils to help me wake up and focus a bit better
Also works as mosquito repellent on some species so if I forget bug spray I use some of this instead
It’s this stuff:
My former boss’s wife is Thai and empathized with my hatred of mosquito bites, so she gifted it to me. Apparently it’s not uncommon to carry it in your purse over there. I live in the US and have seen it at Asian pharmacies.
Likely any strong herbal extract oil applied under the nose would have the same (I’m assuming mostly psychological) mild stimulating effect. Just make sure whatever it is, it’s safe to apply topically.