Focus Stack (No Stimulants)

Public • 1/28/2026

Supports focus and mental clarity without stimulants.

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Practical pre-check

Deterministic heuristics (stimulants, duplicates, hydration). Not medical advice.

Supplements

Items in this stack

Training load

Unknown load

Need more wearable data

Stimulant estimate

0 mg

Only counts explicit caffeine items

Looks clean

No obvious duplication/stimulant/hydration flags from the heuristic pass.

AI risk assessment

Context: No wearable data

No assessment yet.

Supplements

2 items

L-TheanineModerate

Morning or as needed • Capsule • Click to expand

Promotes calm focus and attentional control.

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200mg

Attention and 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 and 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 and recognition reaction time; non-significant for simple reaction time and 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-Tyrosine

Before cognitive load • Powder • Click to expand

Supports catecholamine synthesis under stress.

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1000mg

Evidence curation in progress.