30
Participants
Start Date
September 2, 2023
Primary Completion Date
May 17, 2025
Study Completion Date
May 17, 2025
Black tea flavoured, tea drink
Black tea powder containing 50.0 mg of caffeine and 11.5 mg of theanine, to be dissolved in 200 ml boiling water.
Black tea flavoured, caffeine-only drink
50.0 mg of caffeine in a black tea-like powder i.e., matched to the 'black tea' intervention for flavour and appearance, to be dissolved in 200 ml boiling water. Caffeine is the only biologically active ingredient in this intervention.
Black tea flavoured, placebo drink
A black tea-like powder i.e., matched to the 'black tea' intervention for flavour and appearance, containing no biologically active ingredients, to be dissolved in 200 ml boiling water.
Green tea flavoured, tea drink
Green tea powder containing 30.6 mg of caffeine and 11.1 mg of theanine, to be dissolved in 200 ml boiling water.
Green tea flavoured, caffeine-only drink
30.6 mg of caffeine in a green tea-like powder i.e., matched to the 'green tea' intervention for flavour and appearance, to be dissolved in 200 ml boiling water. Caffeine is the only biologically active ingredient in this intervention.
Green tea flavoured, placebo drink
A green tea-like powder i.e., matched to the 'green tea' intervention for flavour and appearance, containing no biologically active ingredients, to be dissolved in 200 ml boiling water.
The Rowett Institute, Aberdeen
Lipton Teas and Infusions
UNKNOWN
University of Aberdeen
OTHER