Zonulin
Zonulin is a protein that regulates the tight junctions between intestinal cells, so its level serves as a surrogate marker of gut barrier permeability, often called leaky gut. A preventive practice tracks it because increased permeability is linked to autoimmunity, metabolic dysfunction, and systemic inflammation.
What It Measures
Tight-junction regulator; surrogate for intestinal permeability.
Optimal vs. Lab Range
Target range for optimal health and longevity based on research.
Population-based reference range from standard labs.
Why It Matters
Elevated in leaky gut, autoimmunity, NAFLD.
When Low
—
When Optimal
Low → intact barrier.
When High
High → permeability, immune activation.
How to Optimize
Remove triggers (alcohol, NSAIDs, gluten if sensitive); glutamine 5–15 g/day, zinc carnosine, butyrate.
Key Interventions & Linked Compounds
Moderate (6/10)Key Interventions
Linked Compounds & Supplements
Curated from clinical literature. Individual results vary; consult a qualified clinician before changing a protocol.
Ordering Notes
Specimen
Serum or plasma (venous draw)
Patient prep
No fasting required. Maintain usual diet and medications unless advised.
Recommended cadence
Re-test every 3–6 months when actively optimizing; annually for monitoring.
Reporting unit
ng/mL
Pre-analytic notes
Standardize draw time of day, hydration, and recent exercise. Note any acute illness, supplements, or hormonal therapies on the requisition.
Recommended Follow-Up Actions
- 1
Confirm the result is reliable
Repeat abnormal values before acting — preferably from the same lab, same time of day, and under consistent prep. Rule out acute illness, recent intense exercise, or medication effects that can shift Zonulin.
- 2
Compare against optimal, not just lab range
Use the optimal window above as the target. Lab "normal" is built from the general population and often misses early dysfunction.
- 3
Pair with related markers
Order a complementary panel covering metabolic, inflammatory, and hormonal context to interpret this marker properly.
- 4
Discuss interventions with a clinician
Use the interpretation guidance above to frame the conversation. Bring trends, not just one datapoint, to your visit.
- 5
Re-test on a defined cadence
If a change is implemented, re-measure in 8–12 weeks for fast-moving markers, or 3–6 months for slower ones, to confirm response before escalating.
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