Separating the Hype from the Truth about Colostrum

By Dr. Cameron Craw, ND, LAc

Colostrum is the first form of milk produced by a mother after she gives birth. It is distinct from regular milk in that it is much richer in growth factors, antibodies, and glycans, making it well suited to kick-start a newborn's digestive and immune systems. Bovine colostrum is the form most commonly used as a nutritional supplement. But colostrum is designed for newborns — so why are people of all ages using it, and which health claims are supported by evidence?

Intestinal Permeability

Increased intestinal permeability — sometimes called "leaky gut" — occurs when the gut lining becomes compromised, allowing toxins, antigens, and partially digested food particles to pass into the bloodstream unchecked. The health issues that can follow span the gastrointestinal, metabolic, and inflammatory domains and often include symptoms such as diarrhea, abdominal pain, bloating, rashes, brain fog, fatigue, new or worsening allergies, and many others. bovine colostrum contains growth factors that support processes involved in gut barrier restoration, including epithelial cell proliferation and repair. These epithelial cells regulate the critical function of determining what is to be absorbed and what is excluded to maintain overall health.

Immunity

A healthy gut keeps pathogens in check through complex immune signaling and pathogen-neutralizing processes. Immunoglobulins (antibodies) play an important role by binding and neutralizing specific microbial threats within the gastrointestinal tract. Bovine colostrum is rich in immunoglobulins (especially IgG) and is thought to support resistance to gastrointestinal infection when consumed regularly. As with many orally delivered compounds, bovine immunoglobulins are at least partially degraded during digestion, though a meaningful fraction of bovine IgG may survive digestion.

One human study found approximately 19% of ingested IgG reached the ileum in immunologically active form.

Another potent immune-enhancing agent in bovine colostrum is the glycoprotein lactoferrin. Lactoferrin has broad antimicrobial properties driven by numerous mechanisms:

• Iron binding — Lactoferrin deprives pathogens of a nutrient essential for growth.
• Microbial membrane disruption — The lactoferrin molecule interacts with anionic molecules on bacterial and fungal surfaces causing membrane destabilization.
• Inhibition of microbial adhesion — Lactoferrin hampers many pathogen virulence factors that would allow for adherence to intestinal epithelium.
• Biofilm disruption — Lactoferrin can reduce biofilms formed by some pathogenic organisms.

The Microbiome

The gut microbiome exerts wide-ranging effects on numerous systems including (but not limited to) the immune, nervous, and digestive systems — meaning anything that impacts the microbiome may have significant secondary effects on things such as inflammation, mentation, and metabolism. Bovine colostrum contains substances that may be able to promote microbiome balance from both directions, promoting the growth of beneficial bacteria while limiting the overgrowth of potentially harmful ones.

Oligosaccharides: Serve as a selective food source for beneficial Bifidobacteria species

Lactoferrin: Helps limit overgrowth of potentially harmful bacteria, supporting microbial balance

Enzyme Science takes its microbiome support further by combining bovine colostrum with beneficial probiotics in their Colostrum + Probiotics product.*

Conclusion

For those looking to support digestive and immune health, bovine colostrum represents a well-reasoned, evidence-informed option worth considering — not because colostrum was ever intended for adults, but because the biology it supports doesn't stop mattering after infancy.

About the Author 

Dr. Craw is a licensed Naturopathic Physician and licensed Acupuncturist on a mission to help others feel more comfortable in their own bodies. His clinical interests include both evidence based and traditional therapies and practices that foster greater internal and interpersonal harmony. He understands that the body, heart, and mind are deeply interconnected and can all be enlisted as valuable resources in one’s healing journey. He is committed to identifying and treating the root cause of each person’s symptoms, rather than simply pursuing symptom relief.

Dr. Craw believes that the most potent approach to medicine arises from the complementary interplay between Eastern and Western medical philosophies. He has spent many years striving to build competency in both Eastern and Western medical traditions to actualize this complementarity within himself. He is passionate about sharing what he has learned and strives to ensure that every patient leaves feeling heard, accepted, and empowered in their healing journey.

Before joining YNC, Dr. Craw spent 5 years in the United States Navy where he served as a Command Fitness Leader. He then traveled to Indonesia to pursue extensive training in Yoga. He completed a bachelor’s degree in Contemplative Psychology (mindfulness-based psychotherapy) with a special focus on embodiment practices. He extensively explored East Asian arts while concurrently worked his way through Naturopathic medical school. During and after his time in medical school he spent two years providing advanced care in functional gastroenterology under the guidance of Steven Sandberg-Lewis, ND.

In his free time, Dr. Craw enjoys playing and writing music, playing soccer, rock climbing, and hiking/backpacking with his wife and dog.