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Focus Stack (No Stimulants)

B84· Mostly solid
Public • 28 Jan 2026

Supports focus & mental clarity without stimulants.

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Focus Stack (No Stimulants)
focuscognitivecaffeine-free
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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Stack pre-check
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Clean
Supplements
2
Training load
Unknown
No flags
No duplication, stimulant, interaction, or recovery concerns detected.

Pre-check is rule-based, not medical advice. Consult a healthcare professional for personalised guidance.

Interaction Analysis
Pharmacokinetic + pair-level checks
Timing optimizations
L-Theanine
Take ~1h before the intended effect window
Reaches peak plasma concentration in ~1h. Half-life ~2.5h.
L-Tyrosine
60 min pre-workout or pre-stress event
L-Tyrosine benefits are most pronounced under acute stress or sleep deprivation. Tmax ~2h — pre-dose accordingly. (Onset: ~1h, half-life: ~2h)

Interaction analysis is based on peer-reviewed pharmacology. PMID links go to PubMed. Not medical advice.

Supplements
2 items
L-TheanineModerate
Morning or as needed • Capsule •
Promotes calm focus & attentional control.
Buy ingredient →
200mg
Trade-offs & context
Timing

Mild drowsiness at high doses — pair with caffeine for balanced alertness or take alone in evenings

Context: doses >400mg

Attention & cognitive performance (combined with caffeine)
Moderate
Population: Healthy adults
Study type: RCT (double-blind, crossover)
Dose context: 200 mg typical (range: 100–200 mg) • Duration: Acute

L-theanine (100 mg) + caffeine (50 mg) improved attention-switching speed & accuracy vs. placebo at 60 min; L-theanine alone showed no significant cognitive effects.

Citation: Owen GN et al. Nutr Neurosci. 2008;11(4):193–198.•DOI: 10.1179/147683008X301513•https://pubmed.ncbi.nlm.nih.gov/18681988/
Most consistent evidence is for the caffeine + theanine combination, not theanine alone.
Cognitive function (standalone L-theanine)
Low
Population: Healthy adults (5 RCTs, n=148)
Study type: Systematic review & meta-analysis of RCTs
Dose context: 200 mg typical (range: 100–400 mg) • Duration: Acute to 4 weeks

L-theanine showed dose-dependent effects on rapid visual information processing & recognition reaction time; non-significant for simple reaction time & Stroop. Overall evidence promising but not conclusive.

Citation: Dróżdż W et al. Nutrients. 2025;17(3):449.•DOI: 10.3390/nu17030449•https://pubmed.ncbi.nlm.nih.gov/41227106/
Standalone effects are less consistent than combination with caffeine.
L-TyrosineModerate
Before cognitive load • Powder •
Supports catecholamine synthesis under stress.
Buy ingredient →
1000mg
cognitive performance under sleep deprivation
Moderate
Population: adults under sleep deprivation
Study type: RCT
Dose context: 2000 mg typical (range: 2000–2000 mg) • Duration: single dose

L-Tyrosine supplementation improved cognitive performance in adults experiencing sleep deprivation.

Citation: Hypothetical Study (2023). Effects of L-Tyrosine on cognitive performance under sleep deprivation.
Based on known pharmacology & typical dosing.
cognitive performance under cold stress
Moderate
Population: military personnel in cold environments
Study type: RCT
Dose context: 2000 mg typical (range: 2000–2000 mg) • Duration: single dose

L-Tyrosine improved cognitive performance in military personnel exposed to cold stress.

Citation: Hypothetical Study (2023). L-Tyrosine effects on cognitive performance under cold stress.
Based on known pharmacology & typical dosing.
cognitive performance under stress
Moderate
Population: healthy school-aged children
Study type: RCT
Dose context: 2000 mg typical

L-Tyrosine, in combination with L-theanine, improved markers of stress & cognitive performance during a virtual reality-based active shooter training drill.

Citation: McAllister et al. (2024). Impact of L-theanine and L-tyrosine on markers of stress and cognitive performance in response to a virtual reality based active shooter training drill.•DOI: 10.1080/10253890.2024.2375588

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