Colostrum

animal part or source

What is it

Colostrum is the first milk produced by mammals after giving birth, rich in immunoglobulins, growth factors, antimicrobial peptides, and immune cells. Bovine (cow) colostrum is the most common supplement form, marketed for immune support and gut health.

How it works

Bovine colostrum contains high concentrations of immunoglobulin G (IgG) along with smaller amounts of IgA and IgM. These antibodies provide passive immunity in newborn calves and may exert similar immune effects in the gut when consumed by humans, though most IgG is broken down during digestion before systemic absorption. Colostrum also contains growth factors (insulin-like growth factor 1 and 2, transforming growth factor-beta, epidermal growth factor) that may support intestinal cell growth and repair. Lactoferrin, an iron-binding antimicrobial protein, supports immune function. Proline-rich polypeptides may modulate immune cell activity. Research on colostrum has focused primarily on athletic performance, intestinal permeability ('leaky gut'), respiratory infections, and infectious diarrhea. Clinical evidence is mixed, with some positive findings particularly for athletic gut health and upper respiratory infections.

Evidence for 5 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Athletic performance and gut permeability

Grade B

Good evidence

Several trials suggest bovine colostrum (20 to 60 g daily) may reduce exercise-induced gut permeability and improve some markers of performance and recovery. Evidence is moderate; effect sizes vary.

Upper respiratory infections

Grade C

Moderate evidence

Some randomized trials report reduced incidence of upper respiratory tract infections in athletes and military personnel using colostrum daily for several weeks. Effect sizes are modest and trial quality varies.

Infectious diarrhea

Grade C

Moderate evidence

Hyperimmune colostrum (from cows immunized against specific pathogens) has shown effects in preventing or reducing severity of infectious diarrhea in some populations. Standard colostrum effects are less consistent.

Gut health (general)

Grade C

Moderate evidence

Growth factors and immunoglobulins in colostrum may support intestinal barrier function. Clinical evidence for specific gut health conditions like IBS or IBD is limited and mixed.

Wound healing and tissue repair

Grade D

Mixed evidence

Growth factors in colostrum (IGF-1, TGF-beta) support tissue repair in laboratory models. Direct clinical evidence for wound healing applications in humans is limited.

4 commercial forms

Colostrum powder

Spray-dried or freeze-dried; quality varies by collection timing.

Standard supplement form. Mixed into water, milk, or smoothies. First-milking colostrum (collected within hours of calving) contains the highest IgG content.

Colostrum capsules

Convenient but typically lower dose than powder.

Encapsulated colostrum powder. Easier to take but may require multiple capsules to reach research-level doses.

Liquid or chewable colostrum

Pre-dissolved or chewable forms.

Less common formats. May be useful for children or those who prefer not to swallow powder or capsules.

Hyperimmune colostrum

Specific antibody profile from immunized cows.

Cows immunized against specific pathogens produce colostrum with elevated antibodies against those pathogens. Used in some clinical research and specialized products.

Dosage

There is no RDA. Studies have used 10 to 60 g of colostrum daily, with most research using 20 to 40 g. Lower doses (1 to 3 g) are common in commercial capsule products. Quality varies by source, with first-milking colostrum (within 6 hours of birth) being highest in immunoglobulins.

When and how to take it

Colostrum can be taken any time of day. Some protocols recommend on an empty stomach to minimize digestion of antibody proteins, though clinical evidence for this approach is limited. The proteins are water-soluble. For exercise and gut health applications, daily consistent dosing matters more than precise timing.

Safety

Colostrum is generally well tolerated. Side effects are uncommon and include mild gastrointestinal upset. Allergic reactions are possible, particularly in people with cow's milk allergy. Some products may contain residual lactose, which can affect lactose-intolerant individuals. Long-term safety data are limited.

Who should be cautious

People with cow's milk allergy should avoid colostrum. Those with lactose intolerance should test small amounts before regular use. People with autoimmune disease or on immunosuppressive medications should consult a clinician. Pregnant women should consult a clinician before using colostrum supplements due to limited safety data. Vegans avoid all dairy-derived products.

Interactions

Colostrum may have immunostimulatory effects that could theoretically interfere with immunosuppressive medications used after organ transplant or for autoimmune diseases. The lactoferrin content may modestly affect iron metabolism. No major drug interactions have been clinically documented.

Frequently asked questions

Does colostrum from cows work in humans?⌄

Bovine colostrum contains many bioactive components, but humans cannot absorb most intact antibodies through the gut. Effects in humans are thought to come from local gut activity, growth factor signaling, and immunomodulatory peptides rather than direct antibody transfer.

How is colostrum collected?⌄

Colostrum is typically collected within the first hours to days after a cow gives birth. The calf is given priority access to colostrum first, with surplus collected for processing into supplements. Quality and IgG content are highest in first-milking colostrum.

Is colostrum the same as whey or milk?⌄

No. Colostrum is the first milk produced after birth, with much higher concentrations of immunoglobulins, growth factors, and immune cells than regular milk. Standard whey is derived from regular milk after most of the bioactive colostral components have decreased.

Is bovine colostrum vegetarian?⌄

Bovine colostrum is a dairy product and is technically vegetarian (no animal slaughter). However, some vegetarians and vegans avoid it on ethical grounds because of concerns about reducing what is available to the calf.

How much IgG should colostrum contain?⌄

Quality colostrum supplements typically contain 20 to 40 percent immunoglobulins (mostly IgG). First-milking colostrum can have higher concentrations. Check the product label for standardization.

References

  • Colostrum (Wikidata) — Wikidata link

Track Colostrum with Pilora

Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.

Coming to App Store

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you're pregnant, breastfeeding, on medications, or managing a chronic condition.