Natural Caffeine, 50 mg
Caffeine acts in part by binding to the adenosine receptor, which prevents adenosine itself from binding. Adenosine is one of the molecules responsible for producing the feeling of fatigue, so when caffeine inhibits its binding to the adenosine receptor, we feel more alert and focused.
L-Theanine, 150 mg
Theanine is an amino acid with relaxing, but not sedating, properties. It neither interacts with sedative neurotransmitters nor causes feelings of fatigue. It can reduce the overexcitability often caused by caffeine without impairing caffeine’s stimulatory effect. In fact, the improvements in concentration (focus and attention span) induced by caffeine and theanine respectively have been shown to be synergistic.
L-Tyrosine, 300 mg
L-Tyrosine is an amino acid that is used to produce noradrenaline and dopamine; it appears to reduce stress during exposure to acute stressors (which tend to deplete noradrenaline) and may help to prevent stress-induced memory and attention deficits.