Getting rid of leaky gut comes down to removing the things that damage your intestinal lining and giving your body the conditions it needs to repair itself. The gut lining replaces its cells every few days, so when you eliminate triggers and support the healing process, improvements can begin within weeks, though full recovery often takes several months.
“Leaky gut” isn’t a formal medical diagnosis, but the underlying problem, increased intestinal permeability, is well documented. Your intestinal lining is held together by protein structures called tight junctions that control what passes through into your bloodstream. When these junctions loosen, larger molecules slip through and trigger inflammation. The goal is to tighten those junctions back up.
What Causes the Damage in the First Place
Before you can heal, you need to understand what’s breaking down the barrier. Several triggers are known to loosen tight junctions or increase inflammation in the gut lining, and most people dealing with permeability issues have more than one at play.
Gluten is the most studied dietary trigger. In people with celiac disease, there is consistent evidence that gluten increases intestinal permeability. It does this by triggering the release of a protein called zonulin, the only known natural regulator of tight junctions in the gut. Zonulin essentially tells those junctions to open up. Whether gluten causes the same degree of permeability in people without celiac disease is less clear, but some individuals without celiac still show a zonulin response to gluten.
NSAIDs like ibuprofen and aspirin, when used long-term, increase intestinal permeability by ramping up inflammatory signals in the gut wall. Excessive alcohol also loosens the barrier by interfering with the proteins that hold cells together. Chronic stress contributes through a different route: stress hormones have been shown to weaken barrier function, reduce the production of protective mucus, slow the replacement of lining cells, and shift the composition of gut bacteria. Poor sleep disrupts the distribution of healthy gut bacteria, which can further compromise the barrier. Smoking increases inflammation throughout the digestive tract and is a risk factor for several bowel conditions.
Remove the Triggers
The single most impactful step is eliminating or reducing whatever is driving the permeability. For many people, this means a combination of changes rather than one fix.
- Cut back on or eliminate gluten for a trial period of at least four to six weeks, especially if you have any autoimmune condition or unexplained digestive symptoms. If you have celiac disease, strict lifelong avoidance is necessary.
- Limit alcohol to modest amounts or avoid it entirely during the healing phase.
- Talk to your doctor about NSAID use. If you take ibuprofen or aspirin regularly, there may be alternatives that are easier on the gut lining.
- Address chronic stress. This isn’t a soft recommendation. Stress hormones directly inhibit the growth of new lining cells and reduce mucus production, both of which you need for repair.
- Prioritize sleep. Disrupted sleep patterns alter gut bacteria composition in ways that compromise the barrier.
You don’t need to do everything at once. Start with the triggers you can identify most clearly in your own life. If you drink alcohol regularly and take ibuprofen several times a week, those two changes alone remove significant sources of ongoing damage.
Eat to Support Gut Repair
Once you’ve reduced the sources of damage, your diet becomes the primary tool for rebuilding the lining. The gut epithelium turns over rapidly, replacing itself roughly every three to five days, so providing the right raw materials matters.
Focus on whole, minimally processed foods. Vegetables, fruits, healthy fats, and quality protein give your body the building blocks for new cells and feed beneficial gut bacteria. Fermented foods like yogurt, kefir, sauerkraut, and kimchi introduce beneficial microbes that help maintain the barrier. Bone broth is commonly recommended because it provides amino acids like glycine and proline that support connective tissue, though clinical studies specifically on bone broth and permeability are limited.
Fiber-rich foods are particularly important. Your gut bacteria ferment fiber into short-chain fatty acids, which directly nourish the cells lining your colon and strengthen the barrier. Good sources include oats (if you tolerate them), legumes, sweet potatoes, flaxseeds, and a wide variety of vegetables. Aim for diversity. The more types of plant foods you eat, the more diverse your gut microbiome becomes, and diversity is closely linked to barrier integrity.
Reduce ultra-processed foods, added sugars, and seed oils that tend to promote inflammation. You don’t need to follow a rigid protocol. The core principle is simple: eat real food, emphasize plants and fermented foods, and avoid the things that caused the problem.
Supplements That May Help
A few supplements have evidence behind them, though none are magic bullets.
L-glutamine is the most researched. It’s the preferred fuel source for the cells lining your intestine. In a study of patients with intestinal wounds, those who took 10 grams per day of oral glutamine had significantly higher rates of mucosal healing (38% versus 16%) compared to those who didn’t take it. The glutamine group also healed faster overall. For general gut support, doses in the range of 5 to 10 grams per day are commonly used.
Probiotics can help restore barrier function. Research on Lactobacillus plantarum, a well-studied strain, shows it can increase production of key tight junction proteins (claudin-1, occludin, and ZO-1) while reducing inflammatory signals. Look for probiotic products that list specific strains and contain billions of colony-forming units. Multi-strain formulas that include various Lactobacillus and Bifidobacterium species are a reasonable starting point.
Zinc plays a direct role in maintaining tight junction integrity and supporting cell turnover in the gut lining. If you’re deficient, supplementation can make a noticeable difference. Omega-3 fatty acids from fish oil help reduce the inflammatory signals that contribute to permeability. Vitamin D supports both immune regulation and barrier function, and deficiency is common in people with gut issues.
How Long Recovery Takes
The gut lining itself regenerates quickly, with new cells appearing within days. But that doesn’t mean you’ll feel better in a week. The timeline depends on how much damage exists, how many triggers you’re able to remove, and whether an underlying condition like celiac disease or inflammatory bowel disease is involved.
For most people making dietary and lifestyle changes, noticeable improvement in digestive symptoms typically begins within two to eight weeks. Full mucosal healing takes longer. In clinical settings where intestinal healing is tracked with endoscopy, early assessments at 12 to 16 weeks show healing rates between 25% and 50%. Some conditions require three to four months or more to reach peak healing, even with targeted treatment.
A realistic expectation: you’ll likely feel meaningfully better within one to three months if you’ve successfully removed the major triggers and are eating to support repair. Complete restoration of barrier function can take six months or longer, particularly if you’ve been dealing with permeability issues for years.
The Connection to Autoimmune Disease
Increased intestinal permeability has been documented in inflammatory bowel disease, celiac disease, type 1 diabetes, multiple sclerosis, autoimmune hepatitis, and lupus. In most of these conditions, scientists currently view permeability as a feature or symptom of the disease rather than a proven independent cause. However, there is an active debate about whether a leaky gut can precede and contribute to the development of autoimmune conditions, rather than simply resulting from them.
If you have an autoimmune condition, addressing intestinal permeability is worth pursuing as part of your overall management, but it’s not a substitute for disease-specific treatment. If you have persistent digestive symptoms, unexplained food sensitivities, or a known autoimmune disease and suspect gut permeability is playing a role, working with a gastroenterologist can help identify whether conditions like celiac disease or inflammatory bowel disease are driving the problem.
A Note on Testing
You may see “zonulin testing” marketed as a way to measure leaky gut. Be cautious. A 2021 analysis published in the journal Gut found that commercially available zonulin tests don’t actually measure zonulin. They measure concentrations of unknown proteins, and their results correlate poorly with actual gut permeability. There is currently no standard, validated test to directly measure intestinal permeability in a clinical setting. For now, your symptoms and response to dietary changes are more reliable guides than any lab test you can order.