Focus Stack (No Stimulants)
L-Theanine
Morning or as needed
MODERATE
200mg
L-Tyrosine
Before cognitive load
MODERATE
1000mg
No interactions detected
Each dose includes evidence rationale · doses personalized to your weight
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2 items
Morning or as needed · Capsule
Attention & cognitive performance (combined with caffeine)Cognitive function (standalone L-theanine)
Promotes calm focus & attentional control.
200mg
Before cognitive load · Powder
cognitive performance under cold stresscognitive performance under sleep deprivationcognitive performance under stress
Supports catecholamine synthesis under stress.
1000mg
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