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Does colostrum heal your gut and boost immunity?
A few small trials, mostly in athletes, hint at fewer colds and less gut leakiness; good evidence is lacking.
What you hear: “Bovine colostrum heals a leaky gut and supercharges your immune system.”
What the studies found
Most colostrum research involves small groups of athletes. In a crossover trial of 12 volunteers, two weeks of colostrum blunted the rise in gut leakiness after hard exercise, a lab marker rather than a health outcome. A pooled analysis of 5 trials (152 people in exercise training) found fewer days with cold-like symptoms over 8 to 12 weeks, but the authors said a larger, well-designed trial is needed. A 2025 pooled analysis of supplements for exercise-related gut damage, which included several colostrum trials, found no significant effect of colostrum on a blood marker of gut damage, and judged the changes seen with any supplement too small to matter clinically. A review of 8 studies in children could draw no conclusion on gut health.
Take care: Colostrum comes from cow's milk, so people with a milk allergy should avoid it.
What you could do
If you are a heavy trainer curious about colostrum, it is low risk to try, but sleep, diet and vaccines are surer ways to support immunity.
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Not medical advice. General information from published studies, not a diagnosis or a treatment plan. Talk with your doctor before starting a supplement or changing a medicine, especially if you are pregnant, take other medicines or have a health condition.
How we judged it
Not proven: Not enough good human evidence yet, either way. We judge the claim as it is usually said online, not the habit itself. Trials assign people at random, so they can show cause; observed studies follow people and show a link, not proof. Last checked: October 2026.
The studies, in their own words
- Marchbank et al. Am J Physiol Gastrointest Liver Physiol 2011
Twelve volunteers completed a double-blind, placebo-controlled, crossover protocol (14 days colostrum/placebo) prior to standardized exercise.
- Jones et al. BMC Sports Sci Med Rehabil 2016
Five trials (152 participants) met the inclusion criteria, all of which involved individuals involved in regular exercise training. Over an 8-12 week follow-up period, bovine colostrum supplementation when compared to placebo significantly reduced the incidence rate of URS days (rate ratio 0.56, 95 % confidence intervals 0.43 to 0.72
- Aitkenhead et al. Nutrients 2025
However, when examining the effects of different supplement categories, although significance was observed for a select few supplements, the changes in i-FABP, gastrointestinal symptoms, and exercise performance were outside of clinical relevance.
- Aitkenhead et al. Nutrients 2025 (full text)
Bovine colostrum (Hedges’ g = 0.93, 95% CI −0.12; 1.98, p = 0.07)
- Oswal et al. J Pediatr Gastroenterol Nutr 2025
No conclusion can be drawn regarding the clinical benefits of BC in the gut health of children.
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