Theanine can be used during the daytime at dosages of 200-400mg to offset the jitteriness associated with caffeine.

“And theanine, 100 milligrams to 300 milligrams has a calming effect. Theanine is now showing up in a number of different energy drinks and even some coffees as a way to try and get people to ingest more of a given type of coffee 'cause the idea is it will take away the jitters and the anxiety, allowing people to drink more coffee.”

“Many people opt to take 100 milligrams of theanine, T-H-E-A-N-I-N-E, theanine, as a way to offset some of that jitteriness.”

“the dosages of theanine that are effective for offsetting the jitteriness of caffeine is 200 to 400 milligrams”

“Theanine will reduce the jitteriness of caffeine, which is why many energy drink manufacturers and even some coffee manufacturers are now putting theanine in energy drinks and in ground coffee because, no surprise, it allows people to consume more of that beverage and thereby purchase more of that beverage, which is what these vendors want without feeling overly anxious and jittery.”

“the dosages of theanine that are effective for offsetting the jitteriness of caffeine is 200 to 400 milligrams”

“eleanine certainly is being added to a lot of caffeine containing drinks because it seems to take the Jitters of and um the Assumption being that people can consume more of that um that drink as a consequence”