l-theanine

precursor to ethylamine and glutamic acid

peak plasma concentrations occur at 32 and 50 minutes after oral administration, with a half-life range of 58 to 74 minutes

crosses the blood-brain barrier, with effects on brain activity apparent within 30 minutes and measurable up to 5 hours after administration

ceremonial grade matcha about 50mg per 2g

nutricost, 200mg capsule

L-theanine and coffee, ratio of 1 caffine to 2 theanine