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Non-Stimulant Focus Stack

B84· Mostly solid
Public • 04 Feb 2026

Supports attention & cognitive resilience without stimulants.

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Non-Stimulant Focus Stack
focuscaffeine-freestress
L-Theanine
Daily
MODERATE
200mg
L-Tyrosine
Daily
MODERATE
1000mg
No interactions detected
Each dose includes evidence rationale · doses personalized to your weight
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Stack pre-check
No personal data connected — connect wearables or upload bloodwork for a personalised check
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: ~45 min, half-life: ~3h)

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

Supplements
2 items
L-TheanineModerate
Daily •
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
Daily •
Buy ingredient →
1000mg
Working memory under cold exposure
Moderate
Population: Healthy adults undergoing cold stress
Study type: RCT
Dose context: 2000 mg typical (range: 500–2000 mg) • Duration: Acute

Tyrosine supplementation significantly mitigated cold-induced working memory deficits; proposed mechanism via maintenance of brain catecholamine levels during physiological stress.

Citation: Mahoney CR et al. Physiol Behav. 2007;92(4):575–582.•DOI: 10.1016/j.physbeh.2007.05.003•https://pubmed.ncbi.nlm.nih.gov/17585971/
Benefits appear specific to conditions of catecholamine depletion (stress, fatigue, cold).
Cognitive performance under stress / demanding conditions
Low
Population: Healthy adults under stress (cold, sleep loss, cognitive load)
Study type: Rapid evidence assessment / systematic review
Dose context: 2000 mg typical (range: 500–2000 mg) • Duration: Acute

Weak recommendation in favor of tyrosine for cognitive stress — all reviewed studies showed positive effects; benefits most evident under high environmental demands (cold, fatigue, workload), not at rest.

Citation: Attipoe S et al. Mil Med. 2015;180(7):754–765.•DOI: 10.7205/MILMED-D-14-00594•https://pubmed.ncbi.nlm.nih.gov/26126245/
Tyrosine appears ineffective when catecholamine systems are not stressed; benefits are situational.

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