Compare Supplements

Side-by-side comparison of 2 supplements

Caf9.5

Caffeine

Moderate safety

SPM6.2

Spearmint

High safety

Evidence

Evidence Score9.5/10

Studies: 146

Meta-analyses: 23

Evidence Score6.2/10

Studies: 15

Meta-analyses: 2

Outcome Grades

Sharpen focusA

Improve memory & learningC

Sharpen focusC

Improve memory & learningC

A-F grade per outcome, combining overall evidence with goal-specific relevance. A = strong evidence; F = insufficient. Hover a badge for details.

Pooled effect-size head-to-headBeta

Direct side-by-side from the meta-analysis. Each row is an outcome where ≥2 of your selected supplements have pooled data. Best effect per row highlighted.

Outcome	Caffeine	Spearmint
Sharpen focus — Reaction Time − better · ms	−28.8 weak · CI ∋ 0	−0.0 weak · CI ∋ 0

Click an outcome to see the full ranked table on the goal page.

Dosage & timing

Dosage:

200mg

Best Time:

Morning · with food (preferred)

Can take on empty stomach

Form:

Pill/capsule for precise dosing

Dosage:

900mg/day standardized extract

Best Time:

With meals · with food

Take with food

Form:

Standardized aqueous extract (high-rosmarinic acid)

What you'll notice

👁️ Increased Alertness95%

15-45 minutes

🎯 Improved Focus85%

30-60 minutes

🏃 Better Exercise Performance80%

30-60 minutes

📉 Reduced Free Testosterone80%

2–4 weeks

🧠 Improved Working Memory65%

4–12 weeks

🎯 Enhanced Attention60%

4–8 weeks

Safety

Moderate safety

Contraindications:

Severe anxiety disorders
Uncontrolled high blood pressure
Heart arrhythmias

Drug Interactions:

Stimulant medications (Adderall, etc.)
MAO inhibitors
Certain antibiotics (Cipro)

Side Effects:

Jitteriness/anxietyInsomniaIncreased heart rate

High safety

Contraindications:

Known allergy or hypersensitivity to spearmint or other Lamiaceae family plants (mint, lavender, rosemary)
Severe gastroesophageal reflux disease (GERD) — spearmint may relax lower esophageal sphincter in some individuals
Hormone-sensitive conditions where androgen reduction is contraindicated (consult physician)

Drug Interactions: