The science of tea’s mood-altering magic

Green Tea, Coffee, and Caffeine Consumption Are Inversely Associated with Self-Report Lifetime Depression in the Korean Population

(2018) Jiwon Kim et al.   Nutrients

Anti-Stress, Behavioural and Magnetoencephalography Effects of an l-Theanine-Based Nutrient Drink: A Randomised, Double-Blind, Placebo-Controlled, Crossover Trial

(2016) David White et al.   Nutrients

Acute effects of tea constituents L-theanine, caffeine, and epigallocatechin gallate on cognitive function and mood: a systematic review and meta-analysis

(2014) David A Camfield et al.   NUTRITION REVIEWS

Acute neurocognitive effects of epigallocatechin gallate (EGCG)

(2011) Andrew Scholey et al.   APPETITE

Cognitive function and tea consumption in community dwelling older Chinese in Singapore

(2010) Lei Feng et al.   Journal of Nutrition Health & Aging

The effects of l-theanine, caffeine and their combination on cognition and mood

(2007) Crystal F. Haskell et al.   BIOLOGICAL PSYCHOLOGY