Colostrum and Autoimmune Conditions (Hashimoto's, Celiac): What to Know Before Trying It

Updated October 16, 2026

No published human trial has tested bovine colostrum specifically in Hashimoto's thyroiditis or celiac disease. The closest evidence comes from gut-permeability studies that used about 20 g a day. If you have either condition, colostrum is best treated as a cautious, doctor-informed experiment rather than a therapy. The main practical issues are milk-protein and lactose tolerance, gluten cross-contamination, the timing of thyroid medication, and realistic expectations.

Key takeaways

• Bovine colostrum is a dairy food supplement. It has not been shown to treat, cure, or prevent Hashimoto's, celiac disease, or any other autoimmune condition.
• The research people usually cite is about gut barrier function in athletes and NSAID users, not about autoimmune patients.
• Colostrum contains no gluten. Finished products can still pick it up from shared equipment or added ingredients, so people with celiac disease should look for products certified to under 20 ppm gluten.
• Colostrum powders typically contain lactose, often somewhere around 5–15% by weight. That matters because lactose intolerance is common in both untreated celiac disease and Hashimoto's.
• If you take levothyroxine, take colostrum at a different time of day. Milk proteins and calcium may reduce how much of the drug you absorb.

Why people with autoimmune conditions look at colostrum

Most interest comes from the "leaky gut" idea, which researchers call increased intestinal permeability. Some research suggests that a looser intestinal barrier may let more dietary and microbial fragments reach the immune system. Celiac disease is the clearest example. In celiac disease, gliadin (a gluten protein) triggers release of zonulin, a protein that loosens the tight junctions between gut cells. Alessio Fasano's group has proposed that similar barrier changes may play a part in other autoimmune conditions, including autoimmune thyroid disease. This is an active hypothesis, not settled science.

Bovine colostrum contains immunoglobulins (mainly IgG), lactoferrin, and growth factors such as IGF-1, TGF-β, and EGF. In lab and small human studies, these compounds appear to support the gut lining. For background on these components, see our overview of what colostrum is.

What the human studies actually show

• NSAID-induced gut permeability: In a small trial, Playford and colleagues (1999) found that colostrum blunted the rise in gut permeability caused by indomethacin in healthy volunteers.
• Exercise-induced permeability: In athletes doing heavy exercise, about 20 g a day for 14 days reduced the expected 2.5-fold rise in a gut permeability marker by roughly 80% compared with placebo (Marchbank et al., 2011).
• Distal colitis: A pilot study of colostrum enemas used alongside standard treatment reported symptom improvements (Khan et al., 2002). It was small, and colitis is a different condition from celiac disease.

None of these studies enrolled people with Hashimoto's or celiac disease. None measured thyroid antibodies (TPO-Ab, Tg-Ab), tissue transglutaminase antibodies (tTG-IgA), or the condition of the small-intestinal lining. Whether these results apply to autoimmune patients is still speculation.

Shopping for colostrum? Our own brand is BIOMIXA grass-fed colostrum powder, direct from the maker.

Hashimoto's vs. celiac: what matters for each

Specific concerns for Hashimoto's

Levothyroxine timing

Levothyroxine is sensitive to anything taken with it. Coffee, calcium, iron, soy, and dairy proteins have all been reported to reduce absorption. Colostrum is a concentrated milk product, typically 50–80% protein. It is reasonable to assume it could interfere in the same way. The usual approach is to take thyroid medication on an empty stomach and take colostrum later in the day. If you start a daily supplement, ask your doctor whether to recheck TSH after 6–8 weeks.

The "immune-boosting" question

Some people worry that an "immune-boosting" product could make an autoimmune condition worse. Colostrum's components are better described as immune-modulating, and they act mostly in the gut. Oral IgG is largely digested or stays inside the intestine. There is no good evidence that colostrum raises thyroid antibodies, and no good evidence that it lowers them either. The honest answer is that this hasn't been studied.

Lactose and symptoms

Asik and colleagues found that among Hashimoto's patients with lactose intolerance, restricting lactose was associated with lower TSH levels. If you are lactose intolerant, the lactose in colostrum could cause bloating or loose stools. Those symptoms might be mistaken for a reaction to the colostrum itself.

Specific concerns for celiac disease

Gluten-free status

Colostrum comes from cows' first milk and contains no gluten. The risk lies in processing and formulation: shared equipment, maltodextrin of unclear source, or "proprietary blends". In the US and EU, a "gluten-free" claim means under 20 ppm gluten. Third-party certification (for example GFCO, which uses a 10 ppm threshold) gives more assurance. Our colostrum brands comparison notes which products state gluten-free status.

Colostrum does not replace a gluten-free diet

No supplement allows people with celiac disease to eat gluten safely. Even if colostrum supports the gut barrier in some way, the immune reaction to gluten still happens. The only established management for celiac disease is a strict, lifelong gluten-free diet.

Milk-protein tolerance

Some people with celiac disease also react to dairy, especially soon after diagnosis while the gut lining is healing. If dairy currently gives you symptoms, a concentrated milk product may too. People with a confirmed cow's-milk protein allergy should avoid colostrum entirely.

If you decide to try it: a cautious protocol

1. Talk to your clinician first, especially if you take levothyroxine, immunosuppressants, or biologics.
2. Choose a transparent product. Look for a stated IgG percentage (typically 15–40%; see our IgG percentage guide), a gluten-free certification, and no unnecessary additives.
3. Start low. Begin with 2–3 g a day (roughly ½–1 scoop, about 8–12 kcal) for a week. Many studies used 10–20 g a day, and some used up to 60 g.
4. Change one thing at a time. Don't start colostrum alongside a new diet or another new supplement, or you won't know what caused any change.
5. Track your symptoms and labs. Agree on a fixed trial length (for example 8–12 weeks) and recheck relevant markers.
6. Stop if you react. Persistent bloating, rash, or worsening symptoms are reasons to stop.

For general dosing ranges and side effects, see our dosage and safety page.

FAQ

Can colostrum lower thyroid antibodies?

No study has measured this. Claims that colostrum lowers TPO or thyroglobulin antibodies are extrapolated from gut-barrier research in healthy people and athletes. Selenium, vitamin D status, and other factors have their own research base, but colostrum does not. If you try it, track your antibodies with your doctor rather than relying on how you feel.

Is colostrum safe for people with celiac disease?

Colostrum itself contains no gluten, and many people with celiac disease likely tolerate it. Choose a product certified gluten-free (under 20 ppm) and check it for additives. If you are newly diagnosed and have trouble with lactose, wait until your gut has healed or start with very small amounts. It never replaces a strict gluten-free diet.

Should I take colostrum with my levothyroxine?

No. Take levothyroxine on an empty stomach as prescribed, and take colostrum later, ideally about four hours apart. Colostrum is protein-dense and contains calcium, both of which may reduce how much of the drug you absorb. If you start daily colostrum, ask your doctor whether a TSH recheck after 6–8 weeks makes sense.

Does colostrum help "leaky gut" in autoimmune disease?

Some studies suggest colostrum may limit increases in gut permeability caused by NSAIDs or intense exercise. Those studies did not include people with autoimmune conditions, and permeability is only one part of autoimmunity. It is a plausible area for future research, but current evidence does not support specific benefits for Hashimoto's or celiac disease.

Sources

• Fasano A. Zonulin and its regulation of intestinal barrier function: the biological door to inflammation, autoimmunity, and cancer. Physiological Reviews. 2011;91(1):151–175.
• Playford RJ, Weiser MJ. Bovine colostrum: its constituents and uses. Nutrients. 2021;13(1):265.
• Marchbank T, Davison G, Oakes JR, et al. The nutriceutical bovine colostrum truncates the increase in gut permeability caused by heavy exercise in athletes. American Journal of Physiology – Gastrointestinal and Liver Physiology. 2011;300(3):G477–G484.
• Playford RJ, Floyd DN, Macdonald CE, et al. Bovine colostrum is a health food supplement which prevents NSAID induced gut damage. Gut. 1999;44(5):653–658.
• Asik M, Gunes F, Binnetoglu E, et al. Decrease in TSH levels after lactose restriction in Hashimoto's thyroiditis patients with lactose intolerance. Endocrine. 2014;46(2):279–284.

← More colostrum articles