How fast is
your brain
right now?
Take the quick 60-second reaction test, reveal your Reaction Profile + Mental Speed Score, and see what keeps your brain quick under pressure — not just first thing in the morning.
★★★★★ 61,000+ players · 100% freeTap the instant it turns green
The pad will sit on amber — wait. The moment it flashes green, tap as fast as you can. This measures the exact split-second response that dulls when your brain is running on empty.
Building your Reaction Profile…
The Slow-Starter
Here's the part most people miss: a sluggish response isn't always about sleep — researchers describe it as a brain that's depleted from the thousands of micro-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, your reactions slow, choices get harder, and the 3pm wall hits. These are the 5 signs:
A half-beat slower to respond than you used to be.
Picking the easiest option instead of the best one.
Reacting impulsively instead of responding cleanly.
Putting decisions off until the pressure builds.
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 quickness without the coffee spike-and-drop. You notice what doesn't happen.
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Choose your plan
"I drive for a living — by mid-shift I felt a half-second behind. Two weeks in, that lag is just gone."
"Stimulants spike my anxiety. This doesn't. Quick when I need it, calm the rest of the time."
"I'd been burned by energy drinks. This isn't about a buzz — it's about staying sharp. Six hours in, 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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