[pkinsky]

L-Theanine (amino acid found in green tea) supplements solve that problem.

[jbpetersen]

Got any good sources to read more about that?

[seanp2k2]

Not a great source but it's in these and works for me: https://nootrobox.com/go-cubes

No jitters but if I take all 4 at once I get a pretty unpleasant "coming up" feeling for about 15 minutes. I usually just have 2 a day, and I'd recommend people start with 1 just in the morning.