L-Theanine Against Psychological and Physiological Stress
It was suggested that the oral intake of L-Theanine could cause anti-stress effects via the inhibition of cortical neuron excitation.
https://pubmed.ncbi.nlm.nih.gov/16930802/
L-Theanine and Caffeine for Cognitive Performance and Mood
Study results suggest that L-Theanine and caffeine, in combination, are beneficial for improving performance on cognitively demanding tasks.
https://pubmed.ncbi.nlm.nih.gov/18681988/
L-Theanine for Mental Health
Study findings suggest that L-Theanine has the potential to promote mental health in the general population with stress-related ailments and cognitive impairments.
https://pubmed.ncbi.nlm.nih.gov/31623400/
Caffeine and cognitive functions in sports
The intake of a low/moderate dose of caffeine before and/or during exercise can improve self-reported energy, mood, and cognitive functions, such as aattention; it may also improve simple reaction time, choice reaction time, memory, or fatigue, however, this may depend on the research protocols.
https://pubmed.ncbi.nlm.nih.gov/33800853/
Caffeine for Energy
The intake of a low/moderate dose of caffeine before and/or during exercise can improve self-reported energy, mood, and cognitive functions, such as attention; it may also improve simple reaction time, choice reaction time, memory, or fatigue. However, this may depend on the research protocols.
https://pubmed.ncbi.nlm.nih.gov/33800853/
Caffeine For Depression
Coffee and caffeine consumption are significantly associated with decreased risk of depression.
https://pubmed.ncbi.nlm.nih.gov/26339067/