← All goals

Supplements for focus & alertness

Staying sharp, attentive, and awake.

Start with the basics

  • Sleep is the single biggest lever for attention.
  • Short breaks, hydration, and regular physical activity.

Talk to a healthcare professional first

This information is for education only and is not medical advice, diagnosis, or treatment. Supplements can interact with medications and health conditions. Check with your doctor or pharmacist before starting anything, especially if you take medication, are pregnant or breastfeeding, or have a health condition. These statements have not been evaluated by the FDA; supplements are not intended to diagnose, treat, cure, or prevent any disease.

Ranked by strength of evidence

Caffeine

AStrong evidence

Meta-analyses show caffeine improves attention and reaction time, and partly restores cognitive performance after sleep loss.

Dose used in studies
40–200 mg (about ½–2 cups of coffee)
Time to effect
15–45 minutes
Studies (2)
Safety, side effects & interactions →Where to buy (affiliate)

L-theanine

BModerate evidence

A 2026 meta-analysis of 31 trials found a single 200 mg dose improved reaction time and attention in healthy adults. Combinations with caffeine have also shown benefits for attention.

Dose used in studies
200 mg, 30–60 minutes before the task (optionally with 50–100 mg caffeine)
Time to effect
30–60 minutes
Studies (2)
Safety, side effects & interactions →Where to buy (affiliate)

When to see a doctor

  • Attention problems are long-standing or affect work/school (e.g. possible ADHD).