Quick answer: Supporting a leaky gut, or increased intestinal permeability, usually follows four steps: remove what irritates the lining, replace what digestion is missing, rebalance the microbiome, and repair the lining with targeted nutrients such as glutamine, zinc carnosine and soothing herbs. Daily habits such as eating slowly, managing stress and eating a variety of fiber matter as much as supplements.
Key takeaways
Supporting a leaky gut usually follows four steps: remove what irritates the lining, replace what digestion is missing, rebalance the microbiome and repair the lining.
Common irritants include alcohol, certain foods and ongoing stress, and the first step is often figuring out which ones matter for you.
Daily habits such as eating slowly, getting enough sleep and managing stress support the gut alongside any targeted nutrients.
If you are new to this topic, start with what is leaky gut? symptoms, causes, and how it is assessed. This article focuses on how the gut lining is supported.
Step 1: Remove common triggers
Start by removing foods that bother you; gluten, dairy, alcohol and ultra-processed foods are common culprits. Cut back on frequent NSAID use (ibuprofen, naproxen), if your prescriber agrees, and address infections or overgrowth such as SIBO or hidden gut pathogens. Chronic stress and short sleep belong on this list too.
Step 2: Replace what digestion is missing
Low stomach acid, low digestive enzymes or poor bile flow can leave food poorly digested, which irritates the lining. Support here is individualized.
Step 3: Rebalance the microbiome
Fiber variety, fermented foods and targeted probiotics help restore the bacteria that produce butyrate, the main fuel for colon cells. See short-chain fatty acids and building a diverse microbiome.
Step 4: Repair the lining
L-glutamine is a preferred fuel for the cells lining the small intestine, and collagen and bone broth provide glycine, proline and glutamine. DGL, marshmallow root and slippery elm are soothing herbs that support the protective mucus layer, and zinc carnosine has been studied for supporting the stomach and intestinal lining.
Quercetin and vitamin C may help calm mast cells and histamine reactions. Butyrate directly fuels colon cells, and curcumin and boswellia support a healthy inflammatory response.
Amounts should be individualized, so discuss any supplement with your provider. If you work with me, products I commonly use are in my microbiome gut support plan on Fullscript.
Daily habits that support the gut lining
Eat slowly and in a relaxed state, which supports digestion through the vagus nerve, and build meals around vegetables and a wide variety of plants. Leave a comfortable overnight gap between dinner and breakfast, and prioritize sleep and stress management.
The gut lining and healthy aging
When the gut barrier is leaky, bacterial fragments reach the bloodstream and keep the immune system activated. That steady, low-grade inflammation, along with an unbalanced microbiome, is one of the core processes behind aging. Supporting the gut lining is foundational work that can support energy, skin, mood and immunity downstream. Learn more in inflammaging.
Is testing needed?
Many people start with the steps above. When symptoms are complex or persistent, markers such as zonulin, calprotectin, secretory IgA or LPS antibodies can add detail. Functional labs are optional. They can be helpful in more complex cases, and in my practice they are available only to patients working 1-on-1 with me.
When to see a naturopathic doctor
It may be time to see a naturopathic doctor if digestive symptoms keep returning despite diet changes or probiotics, or if you have a growing list of food sensitivities. The same is true if you have gut symptoms together with skin, joint, mood or energy problems, or if you want a personalized gut plan instead of trial and error.
See a medical provider promptly for blood in the stool, black stools, unintended weight loss, persistent vomiting, severe abdominal pain or fever.
Ready for a gut plan built around you?
A free 15-minute consultation with Dr. Kneessi. No cost, no obligation. In-office in Odenton, MD or by telehealth.
Questions to bring to your clinician
These questions can help you get the most out of your next visit.
Which of the four steps would be most useful for me to focus on first?
Which foods or daily habits would be most worth adjusting first for the health of my gut lining?
Could any of my current medications or supplements be relevant to the health of my gut lining?
How would we track my progress with the health of my gut lining over the next few months?
Practitioner-grade options in my Fullscript catalog: if you and your clinician decide a supplement makes sense, my supplement guide by health goal links to the practitioner-grade products I trust.
Frequently asked questions
How long does it take to support the gut lining?
It varies. Plans are usually reassessed over several weeks to a few months based on how symptoms respond.
Is glutamine safe?
Glutamine is generally well tolerated, but people with liver disease, kidney disease or certain other conditions should talk with their provider first.
Do I have to give up gluten?
Not necessarily forever. Some people benefit from a trial elimination followed by structured reintroduction. Celiac disease should be ruled out before removing gluten.
Can stress cause leaky gut?
Stress can affect gut permeability, motility and the microbiome, so stress management is part of most gut plans.
Sources
- Bjarnason I, et al. Mechanisms of Damage to the Gastrointestinal Tract From Nonsteroidal Anti-Inflammatory Drugs. Gastroenterology 2018. PMID: 29221664. https://pubmed.ncbi.nlm.nih.gov/29221664/
- Kim MH, Kim H. The Roles of Glutamine in the Intestine and Its Implication in Intestinal Diseases. Int J Mol Sci 2017. PMID: 28498331. https://pmc.ncbi.nlm.nih.gov/articles/PMC5454963/
- Mahmood A, et al. Zinc carnosine, a health food supplement that stabilises small bowel integrity and stimulates gut repair processes. Gut 2007. PMID: 16777920. https://pmc.ncbi.nlm.nih.gov/articles/PMC1856764/
- Donohoe DR, et al. The microbiome and butyrate regulate energy metabolism and autophagy in the mammalian colon. Cell Metab 2011. PMID: 21531334. https://pmc.ncbi.nlm.nih.gov/articles/PMC3099420/
- Vanuytsel T, et al. Psychological stress and corticotropin-releasing hormone increase intestinal permeability in humans by a mast cell-dependent mechanism. Gut 2014. PMID: 24153250. https://pubmed.ncbi.nlm.nih.gov/24153250/
- Camilleri M. Leaky gut: mechanisms, measurement and clinical implications in humans. Gut. 2019 (PubMed)
- NIDDK: Celiac Disease
This article is for educational purposes only and is not medical advice. It does not replace an individual evaluation. Talk with your healthcare provider before starting supplements or changing medications, especially if you are pregnant, nursing, or managing a health condition.
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