Every intervention Outliyr has scored for reaction time, ranked by its BioHarmony score for this use case rather than its overall rating. The number beside each name is how well that one thing works for reaction time; the tier beside it is what it is worth once safety, cost and effort are counted across everything else.
29 of 85 evaluated interventions score 3.0+ out of 10 for reaction time · 4 comparisons
Reaction-time benefits likely track attention, processing speed, and vigilance. Westwood 2025 found processing speed was one of the few significant neuropsychological outcomes in ADHD trials. This supports cautious optimism for performance users,…
Whole-Body Vibration aims to improve reaction-time by brief high-frequency mechanical stimulation that primes neuromuscular pathways. Acute studies show faster knee-extensor torque after single bouts, suggesting enhanced motor unit recruitment that could translate…
The evidence points to a plausible use case without proving a universal response. Mann G et al. 2026 is the best anchor here because it reports five studies meta-analyzed, 997 participants and…
Giesbrecht 2010 and other caffeine-stack trials support faster attention-task performance. Mátyus 2025 found a narrow RVIP/RVRT reaction-time benefit but not broad cognitive confirmation. That makes L-Theanine more defensible when reaction time is…
The reported benefit is most likely to show up on short-latency cognitive or performance tasks. The strongest support comes from Yoo C. et al. 2021, but the practical rating stays bounded by…
Attention effects may translate indirectly to reaction time, but Track 1 cognition evidence cautions against broad performance claims. The score stays bounded because Vagus Nerve Stimulation evidence for reaction time can depend…
Semaglutide has no direct evidence for faster response speed in this report. Yao 2024 supports glycemic control and weight effects, which could indirectly help if glucose swings were impairing alertness. It could…
The reported benefit is most likely to show up on short-latency cognitive or performance tasks. The strongest support comes from Cintineo H. et al. 2022, but the practical rating stays bounded by…
The reported benefit is most likely to show up on short-latency cognitive or performance tasks. The strongest support comes from Malykh A. et al. 2010, but the practical rating stays bounded by…
Aerobic fitness may modestly support processing speed and reaction time through vascular and cognitive mechanisms. The effect is indirect and smaller than sport-specific drills, sleep optimization, or stimulant-like acute interventions.
No direct reaction-time evidence was verified. The use case remains unsupported.
No direct reaction-time evidence, apart from sleep-restriction performance data that may not generalize.
No direct reaction-time evidence exists. Acute performance enhancement is not a metformin use case.
No direct reaction-time evidence was identified. Any alertness improvement is subjective and likely mediated through stress, mood, or libido rather than validated psychomotor testing.
No direct reaction-time trial or sports-cognition endpoint. Score remains below neutral.
Reaction time could improve indirectly if TRT corrects fatigue, anemia, or depressive symptoms in a deficient user, but direct reaction-time evidence is limited and cognition findings are not strong.
Acute attention and information-processing reports from Russian human work suggest possible reaction-time relevance, but no verified reaction-time RCT establishes the effect.
Some cognitive processing-speed improvements in attention tasks.
Any reaction-time benefit is indirect through fitness and acute arousal. The protocol does not specifically train perceptual speed or decision speed.
Reaction-time support is modest and likely mediated by stress reduction. V0 evidence included reaction-time improvements, and Zhu 2026 supports broader processing-speed outcomes. This is not a stimulant-like acute performance lever.
Sprinting trains rapid force production, but any reaction-time or perceptual-speed benefit is indirect through arousal and fitness rather than specific cognitive training.
No direct reaction time or coordination evidence exists for tirzepatide. Glycemic stability might help some users with diabetes. Under eating, nausea, hypoglycemia risk with insulin or sulfonylureas, and dehydration could impair reaction…
Cognitive processing speed improved in older adults per Hadanny 2020. Reaction-time and coordination are not established primary endpoints. Score below neutral because the reaction-time use case is best supported indirectly through processing-speed…
Dehydration can impair attention and reaction-related tasks; correction restores baseline.
No direct reaction-time evidence supports BFR as a performance-timing intervention.
Small cognitive-speed findings exist in v0.x, but replication and clinical relevance remain limited.
Docherty 2023 reported acute Stroop performance-speed change, which weakly supports reaction-time-adjacent cognition. The evidence is too small for a strong score.
Reaction-time support is indirect through mood, sleep, and attention; no direct reaction-time saffron protocol is established.
Nothing matches those filters.
Monthly out-of-pocket cost at the most accessible legitimate channel, at the dose the score was given for. 11 of 29 are not priced yet; those cells are left blank rather than guessed.
| Intervention | Monthly cost | At dose | How you get it |
|---|---|---|---|
| Neurofeedback | Not priced yet | ||
| Whole-Body Vibration | $50–$100 | 30 Hz, roughly 0.3g, 10-20 min standing | Over the counter |
| Modafinil | $18–$35 | 200 mg oral tablet | Prescription |
| L-Theanine | $3–$8 | 200 mg L-theanine + 100 mg caffeine | Over the counter |
| Paraxanthine (Enfinity) | Not priced yet | ||
| Vagus Nerve Stimulation | $4–$8 | 10-20 min auricular tVNS at comfortable perceptible intensity | Over the counter |
| Semaglutide | $199–$349 | 0.25 mg weeks 1 to 4, 0.5 mg weeks 5 to 8, 1.0 mg weeks 9 to 12, 1.7 mg weeks 13 to 16, 2.4 mg week 17 onward | Prescription |
| Dynamine (Methylliberine) | Not priced yet | ||
| Phenylpiracetam (Phenotropil) | $21–$42 | 100-200 mg | Grey market |
| Zone 2 Cardio | Not priced yet | Over the counter | |
| Essential Amino Acids | Not priced yet | ||
| Glycine | $2–$3 | 3 g oral glycine | Over the counter |
| Metformin | $4–$30 | 500 mg with dinner for 1 week, then 500 mg twice daily for 1 week, then increase by 500 mg/week toward 1000 mg twice daily as tolerated | Prescription |
| Tongkat Ali | $20–$40 | 200 mg/day Physta standardized extract | Over the counter |
| Ca-AKG (Calcium Alpha-Ketoglutarate) | $15–$30 | 1 g/day generic Ca-AKG oral | Over the counter |
| TRT (Testosterone Replacement Therapy) | $50–$300 | Clinician-selected formulation at the lowest dose likely to restore physiologic testosterone | Prescription |
| Rapamycin | $15–$50 | 3 mg | Prescription |
| Semax | $12–$60 | 300-600 mcg/day of 0.1% spray | Grey market |
| HRV Biofeedback | $5 | 20 min/session at individual RF (4.5 to 6.5 bpm) | Over the counter |
| Norwegian 4×4 | Not priced yet | Over the counter | |
| Ashwagandha | $15–$30 | 300 mg KSM-66 with breakfast and 300 mg with dinner | Over the counter |
| Sprinting (Sprint Interval Training) | Not priced yet | ||
| Tirzepatide | $299–$449 | 2.5 to 5 to 7.5 to 10 to 12.5 to 15 mg | Prescription |
| Hyperbaric Oxygen Therapy | $3,000–$6,000 | 2.0 ATA for 90 minutes with air breaks | In clinic |
| Electrolytes | Not priced yet | ||
| Blood-Flow Restriction Training | Not priced yet | ||
| Astaxanthin | Not priced yet | ||
| Lion’s Mane | $20–$40 | 3 g/day fruiting body extract | Over the counter |
| Saffron | Not priced yet |
Head-to-head reports and category rankings that name a winner on this use case.
Ranked by the live Focus and cognition subrating, not the overall score. Methylene blue leads at 6.5–7.0/10 despite a lower overall, 6.0–6.5/10. Bromantane climbs from ninth to fourth.…
Both score anxiety 7.5–8.0/10, so the tie-breaker is time. L-theanine works in about an hour and you take it when you need it. Ashwagandha takes eight weeks and…
Epitalon, if sleep is the question. It scores sleep quality 6.5–7.0/10 against pinealon's 1.5–2.0/10, because it acts on the pineal gland and melatonin output while pinealon is a…
Pick by symptom. Semax scores 7.0–7.5/10 and wins focus. Selank scores 6.5–7.0/10 and wins anxiety, mood and stress resilience. The 0.2 gap decides nothing. The mechanisms overlap at…
Neurofeedback, at 6.5–7.0 out of 10 for reaction time. Reaction-time benefits likely track attention, processing speed, and vigilance.
Of the top-scoring options, Glycine is the least expensive at about $2 a month, scoring 4.5–5.0 out of 10 for reaction time.
29 of the 85 interventions evaluated for reaction time score 3.0 out of 10 or better, which is the cut-off for appearing on this page.
