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The amino acid l-theanine (the active ingredient in green tea) is considered to have a calming effect without causing sleepiness. This study evaluates whether l-theanine affects blood pressure, heart rate, alertness, and sense of well-being.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Placebo capsule | Placebo Comparator |
| |
| L-theanine capsule | Experimental |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| L-theanine capsule | Dietary Supplement | L-theanine 250mg capsule |
| |
| Measure | Description | Time Frame |
|---|---|---|
| Alertness | The average response time to identify a small rectangle shown on a computer screen. | 48 hrs |
| Alertness | Degree of subjective alertness, measured on a visual analog scale | 48 hrs |
| Well-Being | Sense of subjective well-being as measured on a visual analog scale | 48 hrs |
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Inclusion Criteria:
Exclusion Criteria:
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Physicians at Sugar Creek | Sugar Land | Texas | 77478 | United States |
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| ID | Term |
|---|---|
| C026166 | theanine |
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| Placebo capsule |
| Dietary Supplement |
|