How fast does
your brain
react?
Take the quick 60-second reflex test, reveal your Reaction Type + Mental Speed Score, and see what keeps your mind quick and clear under pressure — not just first thing in the morning.
★★★★★ 61,000+ players · 100% freeTap the moment it turns green
The pad below will glow red — wait for it. The instant it flips to green, tap as fast as you can. We measure your reaction in milliseconds across a few rounds. This tests the split-second alertness that fades first when your brain is depleted.
Building your Reaction Profile…
The Afternoon Lagger
Here's the part most people miss: by mid-afternoon your brain isn't just tired — researchers describe it as depleted from the thousands of decisions you've already made. The good news is that this is one of the more addressable patterns.
It's called decision fatigue
You make tens of thousands of small choices a day. Each one fires glutamate in the prefrontal cortex. When it builds up faster than your brain clears it, reactions slow, choices get harder, and the 3pm wall hits. These are the 5 signs:
Your responses feel a half-second behind where they used to be.
Picking the easiest option instead of the best one.
Putting decisions off until the pressure builds.
Reacting impulsively instead of responding thoughtfully.
Quick in the morning, foggy and slow after lunch.
The conventional fix is more caffeine — but coffee wakes you up, it doesn't help your brain clear the buildup. That's the gap the next step targets →
Numin — clinically studied focus
A once-a-day drink built around the buildup behind decision fatigue. No caffeine kick — you simply notice the lag doesn't arrive. Tastes like lemon iced tea.
Formulated around glutamate clearance in the prefrontal cortex — the brand's described mechanism for decision fatigue.
Rhodiola rosea, L-Tyrosine, Curcumin (Curcugen™), MSM and Crominex 3+ — chosen for cognitive support under load.
Steady clarity without the coffee spike-and-drop. You notice what doesn't happen.
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"I edit for a living — by afternoon I'd miss obvious typos. That lag is gone. I catch things again."
"Stimulants spike my anxiety. This doesn't. An actual solution that doesn't leave me wired."
"I'd been burned by energy supplements before. This isn't about energy — it's about staying sharp. Six hours in, no jitters, no crash."
[*] Manufacturer-cited clinical trial, reported as published in Frontiers in Nutrition (2025). Figures are the brand's claims and have not been independently verified on this page.
[1] Baumeister & Vohs — research on decision fatigue & self-regulation. Overview
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