I actually learned that microdosing “stimulants” may actually lead to dopamine supersensitisation.
Bromantane has poor bioavailability. Nasal spray allows for much better absorption and provides a longer half-life. Reddit - Dive into anything
The inventor of the nasal spray^
This is a miracle Nootropic that provides long-lasting effects even after discontinuation. Use it in the morning right when you wake up, otherwise you might have trouble falling asleep. It’s potent, so spraying once through each nostril is more than enough. I weigh less than 150lbs, so one spray works fine for me.
coffee 
lol. Are you worried about bromantane causing downregulation?
How do you find that companies products?
Is this short boost only ?
Dihexa, so far. I shared my experience here My Dihexa Experiment / Experience
Also Monatomic Gold, Rhodium and Irridium mixture that I used to buy from a store called Tibetan gold was great. It was making me sleepy right after taking it for the first few weeks, but it is great product. Makes me more consciouss overall, more pure and divine.
I respond really well to many of the choline supplements. Choline bitartrate seems to always work. As well as DMAE.
For physical energy and endurance, nothing beats Yerba Mate and Phenylpiracetam!