Cold water immersion at 14°C produces a 530% norepinephrine surge — the largest acute catecholamine stimulus documented for any non-pharmacological intervention — persisting for 3–4 hours. The complete neuroscience of cold exposure and cognitive performance: the norepinephrine and dopamine mechanisms, the autonomic adaptation that builds stress resilience, the 5-week cold shower protocol, and how cold exposure integrates with exercise and supplementation in the morning performance stack.

Biohacking stripped of the theater: the evidence-based advanced protocols that actually produce measurable cognitive performance and brain health improvements. Cold exposure produces a 530% norepinephrine surge. Sauna use associates with a 65% reduction in Alzheimer’s risk. Intermittent fasting elevates BDNF and activates neuronal autophagy. The complete evidence-based framework — mechanisms, dose-response, implementation hierarchy, and the morning stacking sequence that compounds them all.