Two Invited Papers. One Direction: Rebuilding Medicine Around Root Causes.
21st-Century Medicine (IOM) | Orthomolecular & Systems Medicine
I’m pleased to share that I have just submitted two invited review articles to the International Journal of Molecular Sciences (IJMS):
Vitamin D as a Master Regulator of Biological Barrier Integrity
Vitamin C as a Redox-Active Regulator of Barrier Integrity and Immune Signaling
Both are part of invited Special Issues and are currently under peer review.
But this is not just about two vitamins.
It is about something much larger.
The Bigger Problem: Fragmented Medicine
Modern medicine has become extraordinarily sophisticated at:
Targeting mechanisms
Blocking pathways
Suppressing symptoms
Classifying diseases by organ
Yet it often struggles to answer a more fundamental question:
What upstream systemic conditions allow chronic disease to emerge in the first place?
Cardiovascular disease, cancer, autoimmune disorders, neurodegeneration — we treat them as separate silos.
But biologically, they share recurring upstream patterns — in addition to what I call the 10 Root Drivers of chronic disease, first articulated in my 2025 root-cause framework:
Redox imbalance
Barrier dysfunction
Immune dysregulation
Metabolic stress
Hormonal stress signaling
These are not separate diseases.
They are expressions of a destabilized biological system.
Systems Medicine: A 21st-Century Necessity
In these two invited papers, I present an integrated framework that I call:
21st-Century Systems Medicine — Integrative Orthomolecular Medicine (IOM)
Rather than viewing nutrients as simple supplements, this work positions:
Vitamin D as a master regulator of biological barrier integrity
Vitamin C as a redox-active regulator of immune signaling and endothelial stability
Both converge on a unifying systems framework:
Systemic Leaky Barrier Syndrome (SLBS)
A systems-level vulnerability state characterized by multi-barrier dysfunction (epithelial, endothelial, immune interfaces)
👉 Read the full framework here:
Systemic Leaky Barrier Syndrome (SLBS) – Preprint (2026)
And in the vitamin C paper:
The Insulin–Cortisol–Vitamin C (ICV) Axis
A regulatory triad integrating metabolic stress, psychological stress, and redox biology.
👉 Read the full framework here:
The Insulin–Cortisol–Vitamin C (ICV) Axis – Preprint (2025)
Why This Matters
Chronic disease does not begin with cholesterol.
It does not begin with tumors.
It does not begin with autoantibodies.
It begins with loss of systemic regulation.
Loss of barrier integrity.
Loss of redox balance.
Loss of metabolic resilience.
Modern medicine has largely focused on downstream mechanisms.
IOM seeks to restore upstream regulation.
This is not anti-modern medicine.
It is an expansion beyond reductionism.
Reclaiming Root-Cause Thinking
Over the last several decades, healthcare has become:
Focused on isolated molecular targets
Drug-centered
Organ-fragmented
We have accumulated enormous molecular detail — yet often lost the ability to integrate those details into a coherent systems framework.
What has been missing is not mechanism, but integration.
These two invited IJMS papers aim to contribute to restoring that view:
A return to biology that is integrative, regulatory, terrain-based — and mechanistically grounded at the systems level.
Why Vitamins?
Because at the molecular level, vitamins are not “add-ons.”
They are regulatory nodes.
Vitamin D regulates barrier gene expression and immune tone.
Vitamin C regulates redox signaling, endothelial stability, and stress adaptation.
They are systems regulators.
When deficient — biologically or functionally — systemic resilience declines.
The Direction Forward
These invited reviews are part of a broader effort to articulate what I believe medicine must become:
A coherent, redox-aware, barrier-aware, metabolism-aware framework for chronic disease prevention and reversal.
What I call:
Integrative Orthomolecular Medicine (IOM) — 21st-Century Systems Medicine
The future of medicine will not be less scientific.
It will be more integrative.
More systemic.
More upstream.
And ultimately, more effective.
The manuscripts are currently under peer review at IJMS.
I will share updates as the process unfolds.
The work continues.
— Richard Z. Cheng, MD, PhD
Integrative Orthomolecular Medicine