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alertness-level × 8concentration × 3
cognitive-science × 2
brain-exercises × 2
nutrition × 1
side-effects × 1
brain × 1
allergy × 1
caffeine × 1
time-of-day × 1
medical-myths × 1
meal × 1
triggers × 1
memory × 1
dehydration × 1
bleeding × 1
seizure × 1
stimulants × 1
diuretics × 1
unconsciousness × 1
histamine × 1
penetrate-trauma-wound × 1
nootropic-smart-drugs × 1
blood-brain-barrier × 1
exsanguination × 1