| Effect | None |
| Values | Figure 1 |
| Trial Design | Randomized trial |
| Trial Length | 1-7 Days |
| Number of Subjects | 20 |
| Sex | Both Genders |
In a randomized, placebo-controlled trial, 20 healthy participants undergoing high but normal stress took 200 mg of theanine twice daily or a placebo after breakfast and lunch for 17 days.
There wasn't an apparent effect of theanine of salivary alpha-amylase. Subjective stress was lower in the theanine group
