Short answer: the "crash" after stimulants happens because the nervous-system stimulation wears off — supporting focus through circulation and cellular energy instead avoids that pattern entirely.
Why stimulants produce a crash
Caffeine and similar stimulants provide a temporary nervous-system boost. Once that effect fades, alertness can drop below baseline — the familiar "crash" many people experience mid-afternoon.
A different route to sustained focus
Supporting cerebral blood flow (L-Arginine, L-Citrulline) and neuron energy production (Niacin) works through steadier, ongoing physiological support rather than a temporary spike — there's no equivalent "wearing off" crash because there was no acute stimulation to begin with.
What "sustained" realistically means here
Over weeks of consistent use, some people report steadier energy through the day without the peaks and troughs of stimulant use — a gradual pattern that builds rather than spikes.
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