Research suggests colostrum may help support the gut lining when it's under stress. In small human studies, colostrum reduced the exercise-related rise in gut permeability by 80% and blunted the rise caused by an anti-inflammatory drug. A 2024 meta-analysis of 10 trials also found improvements in permeability markers, though studies varied widely and used larger doses than one serve.
Key takeaways
- Gut permeability describes how easily substances pass through the gut lining; it can rise with heavy exercise and some medications.
- In 12 volunteers, 14 days of colostrum reduced the exercise-induced rise in gut permeability by 80% compared with placebo (Marchbank et al., 2011).
- A 2024 meta-analysis of 10 randomised trials found colostrum lowered two sugar-test ratios used to measure permeability (Hajihashemi et al., 2024).
- Results varied a lot between studies, and doses were often around 20 g a day.
What is gut permeability?
Your gut lining is a single layer of cells that does two jobs at once: it lets nutrients through and keeps most other things out. The cells are held together by structures called tight junctions. When the lining is under stress, it can become more permeable, meaning larger molecules pass through more easily than usual.
Researchers often measure this with a sugar test. Volunteers drink a mix of a large sugar (lactulose) and a small one (mannitol or rhamnose), then their urine is tested. A healthy lining lets through much more of the small sugar than the large one. If the ratio of large to small sugar goes up, the gut has become more permeable. You'll see these ratios mentioned in the studies below.
You may have heard the phrase "leaky gut". Increased permeability is a real, measurable thing in research, but the pop-culture term gets used loosely. We'll stick to what the studies actually measured.
Colostrum and gut permeability during heavy exercise
Hard exercise puts the gut under stress. Marchbank and colleagues (2011) tested whether colostrum could make a difference. In a double-blind crossover study, 12 volunteers took colostrum or a placebo for 14 days (around 20 g a day, according to Davison's 2021 review) before a bout of heavy exercise.
- With placebo, heavy exercise increased gut permeability 2.5-fold.
- With colostrum, that rise was reduced by 80%.
It's a small study, but a striking result, and it's one reason colostrum has become popular with endurance athletes. For more on that, see colostrum for athletes, training and recovery.
Colostrum and medication-related gut permeability
Some non-steroidal anti-inflammatory drugs (NSAIDs) can increase gut permeability. In an earlier study, Playford and colleagues (2001) gave seven healthy men the NSAID indomethacin, which raised gut permeability three-fold. When colostrum was taken alongside the drug, there was no significant rise.
This was a very small, short study designed to explore a mechanism. It's not a reason to change how you take any medication. If you take NSAIDs or other medicines regularly, talk to your doctor or pharmacist before adding a supplement.
What does the 2024 meta-analysis say?
Individual studies are useful, but pooling them gives a broader view. Hajihashemi and colleagues (2024) combined 10 randomised controlled trials on colostrum and intestinal permeability.
| Measure | What it indicates | Finding with colostrum |
|---|---|---|
| Lactulose/rhamnose ratio | Sugar test of gut permeability | Reduced (mean difference −0.24) |
| Lactulose/mannitol ratio | Sugar test of gut permeability | Reduced |
| I-FABP | Blood marker of gut cell damage | No significant effect |
| Heterogeneity (I²) | How much results varied between studies | Very high (99%) |
So colostrum improved the two main sugar-test measures, but not the blood marker of gut cell damage. The very high heterogeneity means the included studies differed a lot in their people, doses and methods, so the pooled result should be read with caution.
Which parts of colostrum might be involved?
Researchers have not pinned down exactly which components are responsible. Colostrum contains growth factors such as IGF-1 and TGF-β1 at much higher levels than regular milk, along with lactoferrin, immunoglobulins and oligosaccharides (McGrath et al., 2015). These are the components most often discussed as possible contributors. Our article on lactoferrin, growth factors and other bioactives explains each one.
What this means in practice
The research is encouraging, particularly for people under physical stress. MUUU's label claim reflects that in a measured way: "Gut health: encourages a healthy digestive system".
A few practical points:
- Dose. Studies often used around 20 g a day. One level teaspoon of MUUU Colostrum Powder is 2 g, so research amounts were much larger than one serve. Follow the label directions.
- Consistency. The exercise study ran for 14 days of daily intake before testing.
- Heat. Mix colostrum into cool or warm (not hot) foods and drinks to protect heat-sensitive proteins.
- Foundations first. Fibre, hydration, sleep and a varied diet remain the basics of a happy gut. Colostrum is an addition, not a replacement.
New to colostrum? Start with our Colostrum 101 guide.
FAQs
Does colostrum heal leaky gut?
No study shows that colostrum heals or cures "leaky gut" or any gut condition. Small studies suggest it may help limit rises in gut permeability during stress such as heavy exercise. If you have ongoing gut symptoms, see your doctor.
How long did people take colostrum in gut studies?
In the Marchbank exercise study, volunteers took colostrum daily for 14 days before testing. Other trials varied, which is part of why pooled results differed so much.
Can I take colostrum with ibuprofen or other NSAIDs?
Please ask your doctor or pharmacist. The 2001 indomethacin study was small and experimental, and it isn't guidance for combining supplements with medication.
Is powder or capsules better for gut health?
The colostrum is the same type; the difference is amount and format. Powder gives 2,000 mg per teaspoon, while two MUUU capsules give 1,000 mg. Pick the one you'll take consistently.
References
- Marchbank T, et al. The nutriceutical bovine colostrum truncates the increase in gut permeability caused by heavy exercise in athletes. Am J Physiol Gastrointest Liver Physiol. 2011;300:G477–G484. https://doi.org/10.1152/ajpgi.00281.2010
- Playford RJ, et al. Clinical Science. 2001;100(6):627–633. https://pubmed.ncbi.nlm.nih.gov/11352778/
- Hajihashemi P, et al. Dig Dis Sci. 2024. https://doi.org/10.1007/s10620-023-08219-2
- Davison G. The use of bovine colostrum in sport and exercise. Nutrients. 2021;13(6):1789. https://www.mdpi.com/2072-6643/13/6/1789
- McGrath BA, Fox PF, McSweeney PLH, Kelly AL. Composition and properties of bovine colostrum: a review. Dairy Sci Technol. 2016;96:133–158 (published online 2015). https://link.springer.com/article/10.1007/s13594-015-0258-x
This article is general information, not medical advice. Always read the label and follow the directions for use.
