71XP
Clearly improves alertness, attention and reaction time, especially when tired.
Cognition
Focus & Alertness
Supplements and protocols ranked by XP
32XP
Chronic partial sleep restriction produces cumulative, well-replicated declines in sustained attention and vigilance that build across days of insufficient sleep.
Studies1
25XP
Improves focus and alertness mainly when combined with caffeine; weak effects alone.
16XP
Bright daytime light leaves people more alert and quicker on simple tasks, with weaker effects on complex tasks.
12XP
Steady background noise slightly improves task performance in people with ADHD, with little or negative effect in people without it.
11XP
Little reliable effect on focus in rested adults.
10XP
The main review found low or insufficient evidence that mindfulness programs improve attention.
Studies1
