StackTerminal.Health

BETA

Clean Stimulant Focus Stack

B84· Mostly solid
Public • 04 Feb 2026

Supports alertness with lower jitter risk than caffeine.

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Clean Stimulant Focus Stack
focusenergystimulant
Theacrine
Daily
MODERATE
100mg
L-Theanine
Daily
MODERATE
200mg
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
Theacrine
Take ~1.5h before the intended effect window
Reaches peak plasma concentration in ~1.5h. Half-life ~24h.
L-Theanine
Take ~1h before the intended effect window
Reaches peak plasma concentration in ~1h. Half-life ~2.5h.

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

Supplements
2 items
TheacrineLow
Daily •
Buy ingredient →
100mg
Subjective energy, alertness, & focus
Low
Population: Healthy young adults (n=20)
Study type: RCT (double-blind, crossover)
Dose context: 300 mg typical (range: 200–300 mg) • Duration: Acute (single dose)

Trends for higher self-reported attentiveness, alertness, focus, & energy with theacrine-containing supplement vs. caffeine & placebo; no significant differences on objective cognitive tests (trail making, digit symbol, reaction time).

Citation: Kuhman DJ et al. Nutrients. 2015;7(11):9618–9632.•DOI: 10.3390/nu7115484•https://pubmed.ncbi.nlm.nih.gov/26610558/
Small sample (n=20); self-reported outcomes more positive than objective measures. Tolerance-resistance claim lacks human RCT confirmation.
Cognitive performance & reaction time (combined with caffeine)
Low
Population: Male e-gamers (n=50)
Study type: RCT (randomized crossover)
Dose context: 50 mg typical (range: 50–150 mg) • Duration: Acute

Caffeine (125 mg) + TeaCrine (50 mg) + Dynamine (75 mg) combination improved Flanker inhibitory control & Psychomotor Vigilance Task reaction time vs. placebo; theacrine's isolated contribution is unclear.

Citation: Cintineo HP et al. Front Psychol. 2022;13:849804.•DOI: 10.3389/fpsyg.2022.849804•https://pubmed.ncbi.nlm.nih.gov/35103121/
Most human evidence uses combination formulas; isolated theacrine RCTs remain limited.
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.

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