Good legal over the counter stimulant?

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I want to be able to read for multiple hours a day.
I take both Ritaline (30mg) and L-theanine (400 mg).
In case you're wandering why I don't up the dosage ritaline is highly regulated in my shitty country and my psychiatrist has made me understood that it was a bad idea to up it (had to struggle to find one who would prescribe me it).

Anyway any legal over the counter drug/supplement I could take that helps with concentration?