Four weeks of theanine may ease low mood and anxiety and help sleep
In one trial, 30 healthy adults took 200mg of theanine a day for four weeks. Self-rated depression and anxiety fell, parts of a sleep questionnaire improved, and word fluency gained.
What the study found
Four weeks of 200mg of theanine moved mood, sleep and fluency
In one trial, 30 healthy adults took 200mg of L-theanine a day for four weeks against placebo. Self-rated depression and anxiety fell, several parts of a sleep questionnaire improved, and word fluency and planning gained ground. It tests daily dosing, not one capsule before a task.
The caveat · Many outcomes tested, some by chance
The participants skewed middle-aged and older, and most were women. A long list of outcomes was tested at once, which on its own makes some of the positive ones likely to be chance.
What we don't know
The participants skewed middle-aged and older, and most were women. A long list of outcomes was tested at once, which on its own makes some of the positive ones likely to be chance.