Shelf 01.5
Brain & Body pillar · HiPerformance Culture
Vagus Nerve & Nervous System Regulation
Between threat and calm sits a wiring problem: how quickly the nervous system can stand down.
This corner of the Brain & Body library covers the levers researchers study, from vagal tone and heart rate variability to cold water therapy and the gut-brain axis, with louder claims about ice baths and peptides graded against the research.
newest 24 Jul 2026
Most read here · Assessment
Vagal Tone Assessment: How Resilient Is Your Nervous System? →
Editor's Pick · Vagus Nerve & Nervous System Regulation
Probiotics and Mental Health: What the Gut-Brain Axis Science Actually Shows
What 34 peer-reviewed studies reveal about probiotics, the gut-brain axis, and depression. Evidence hierarchy, mechanisms, and protocols.
Deep dive · 18 Jun 2026
A route through this shelf
Reading order
Measure yourself
Vagal Tone Assessment: How Resilient Is Your Nervous System?Get a baseline before you change anything. 20 questions; scored on real dimensions.
Read the evidence
Probiotics and Mental Health: What the Gut-Brain Axis Science Actually ShowsThe full argument, chapter by chapter.
Apply it
90-Day Vagus Nerve Protocol: Build Unshakeable Stress ResilienceA written method to run: 12 weeks.
Check the hype
Peptide Therapy for Performance: Separating Signal from HypeGH peptides shift body composition, not performance. BPC-157 has no human trial data. The cancer risk signal is real.
The complete shelf, unpaginated
Holdings
Deep Dives
Long-form investigations with full bibliographies.
Cold Plunge & Cold Water Therapy: The Evidence Behind the Ice Bath ObsessionThe evidence behind cold plunge benefits: 25 peer-reviewed sources on what cold water immersion does to your nervous system, metabolism, and recovery.Deep dive · 18 Jun 2026
Probiotics and Mental Health: What the Gut-Brain Axis Science Actually ShowsWhat 34 peer-reviewed studies reveal about probiotics, the gut-brain axis, and depression. Evidence hierarchy, mechanisms, and protocols.Deep dive · 18 Jun 2026
The Gut-Brain Axis: How Your Microbiome Actually Controls Your Mood and FocusWhat 36 peer-reviewed sources reveal about how your gut microbiome shapes mood, focus, and stress. And what actually works to change it.Deep dive · 18 Jun 2026
Guides
Structured, chaptered field manuals.
Protocols
Multi-week programmes with a written method.
Assessments
Scored self-assessments with real question banks.Trend Breakdowns
Claims from the feed, checked against their sources.
Peptide Therapy for Performance: Separating Signal from HypeGH peptides shift body composition, not performance. BPC-157 has no human trial data. The cancer risk signal is real.6 sources scored · 18 Jun 2026
Does an ice bath actually speed recovery?Cuts soreness reliably; blunts muscle growth; cardiac risk is genuine.6 sources scored · 9 Jun 2026
Glossary
Defined terms, each with its own entry.
Heart Rate Variability (HRV): Definition, Measurement & MeaningHRV measures beat-to-beat fluctuations in heart rhythm, reflecting autonomic health, recovery status, and cardiovascular risk.Glossary term · 17 Jun 2026
Parasympathetic Nervous System: Definition and the Rest-and-Digest BranchThe parasympathetic nervous system is the rest-and-digest division of the autonomic nervous system, slowing heart rate and enabling recovery from stress.Glossary term · 17 Jun 2026
Polyvagal Theory: Porges Definition and the Three Vagal StatesPolyvagal Theory describes how the autonomic nervous system uses three hierarchical circuits to regulate social engagement, defence, and shutdown.Glossary term · 17 Jun 2026
Vagus Nerve: Definition, Function & the Body's Information SuperhighwayThe vagus nerve is the tenth cranial nerve, governing heart rate, digestion and the body's anti-inflammatory reflex through brain-organ signalling.Glossary term · 17 Jun 2026
Vagal Tone: Definition, Measurement & Why It Predicts Stress ResilienceVagal tone quantifies parasympathetic influence on the heart via HRV, predicting stress resilience, emotional regulation, and cardiovascular health.Glossary term · 17 Jun 2026
Sympathetic Nervous System: Definition, Function and Why Chronic Overdrive Harms HealthThe sympathetic nervous system mobilises the body under acute stress, releasing catecholamines that prime the heart, lungs, and muscle for rapid action.Glossary term · 17 Jun 2026
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Most read on this shelf
- Vagal Tone Assessment: How Resilient Is Your Nervous System?Assessment
- Probiotics and Mental Health: What the Gut-Brain Axis Science Actually ShowsDeep dive
- Vagal ToneGlossary term
- The Gut-Brain Axis: How Your Microbiome Actually Controls Your Mood and FocusDeep dive
- 90-Day Vagus Nerve Protocol: Build Unshakeable Stress ResilienceProtocol