© Magnific
June 6, 2026
Marianne Waldenfels
Lactoferrin could influence iron absorption, immune function, and gut health. Here’s why the protein found in breast milk is attracting growing scientific attention
A substance that helps protect newborns during their first days of life may also help adults fight infections more effectively and support iron metabolism. Lactoferrin, a long-overlooked protein found in breast milk, has attracted growing attention from doctors, researchers, and supplement manufacturers in recent years.
Researchers believe the protein may do far more than support infants’ immune systems. Lactoferrin is now increasingly being studied in connection with iron deficiency, immune health, and gut function. Some studies even suggest it could complement traditional iron supplements or, in some cases, be better tolerated.
The research itself is not entirely new. Scientists have been investigating the effects of lactoferrin on bacteria, inflammation, and the immune system for decades. What has changed is the level of medical and public interest surrounding the protein.
Lactoferrin is a so-called iron-binding protein. It naturally occurs in the human body, for example in saliva, tears, or certain immune cells. However, breast milk contains particularly high amounts.
There, lactoferrin takes on a kind of protective function. It helps to fend off pathogens and at the same time supports the still immature immune system of newborns. It is precisely these properties that make the protein interesting for adults today.
The most important ability of lactoferrin initially sounds unspectacular: The protein binds free iron.
For many bacteria, however, iron is essential for life. Without sufficient access to it, they reproduce less effectively. By binding iron, lactoferrin effectively deprives some germs of the basis for their growth.
In addition, there is a second effect: Researchers suspect that lactoferrin can directly interact with certain viruses and bacteria. As a result, it might make it more difficult for them to penetrate human cells.
Also interesting is the impact on the immune system. Lactoferrin does not appear to simply act like a classic 'immune booster'. Instead, the protein seems to regulate defense reactions and influence inflammatory processes.
A meta-analysis from 2021 with about 1,700 participants found, for example, evidence that lactoferrin can reduce the risk of respiratory infections. However, the authors emphasized that the body of research is not equally strong everywhere.
Currently, lactoferrin is receiving a lot of attention regarding iron deficiency. This initially seems paradoxical because lactoferrin itself provides hardly any iron. Nevertheless, several studies suggest that the protein could improve the absorption and utilization of iron in the body.
A meta-analysis from 2017 on iron deficiency during pregnancy showed that bovine lactoferrin can be as effective as iron sulfate in pregnant women with iron deficiency anemia, with significantly fewer gastrointestinal side effects.
A recent meta-analysis from the year 2024 with several thousand participants concluded that bovine lactoferrin can improve hemoglobin levels in many cases as well or even better than traditional iron supplements, with a lower rate of gastrointestinal complaints.
That’s exactly what makes lactoferrin interesting. Many people stop taking traditional iron supplements due to side effects like nausea, constipation, or stomach pain.
Much suggests that a large part of the effect takes place directly in the gut. There, lactoferrin seems to stabilize the mucous membrane and simultaneously promote beneficial gut bacteria. Unwanted germs, on the other hand, could be inhibited.
This connection likely explains why lactoferrin is often associated not only with the immune system but also with gut health related.
The topic fits into a development that has been observed in medicine for years: The gut is no longer merely seen as a digestive organ, but increasingly as a control center for immune processes and inflammation.
The further the research goes, the broader the spectrum of possible applications becomes.
Currently being investigated, among other things:
Researchers are particularly curious about whether lactoferrin can cross the blood-brain barrier. Therefore, the protein now also appears in studies on diseases such as Alzheimer or Parkinson's disease.
However, this is still mostly early research. No concrete therapy recommendations can currently be derived from such results.
Lactoferrin is usually offered in doses between 100 and 300 milligrams daily - in areas that have also been studied in many studies.
The protein is particularly commonly used:
Lactoferrin is generally considered to be well tolerated. However, it does not replace medical treatment. Those with diagnosed iron deficiency or chronic illnesses should consult a doctor for guidance.
The appeal of lactoferrin also lies in the fact that many of its effects appear biologically plausible. Unlike some short-term health trends, there is indeed serious research here.
At the same time, a familiar pattern of modern health research emerges: The further you move away from well-researched areas, the more cautious statements must become.
In terms of iron metabolism and certain immunological effects, the data seems relatively solid. In other areas, however, research is still in its early stages.
Lactoferrin is therefore neither a miracle cure nor an overhyped trend. It is an interesting protein with surprisingly broad potential and still some open questions.
Lactoferrin is a naturally occurring protein, that binds iron and thereby can inhibit the growth of certain pathogens. Additionally, it influences the immune system and supports gut health.
Studies show that lactoferrin can improve the absorption and utilization of iron. In some cases, it works comparably or better than traditional iron supplements – with a lower rate of side effects.
Studies typically use 100 to 300 mg daily. Higher dosages should only be taken under medical supervision.
Lactoferrin is generally considered well-tolerated. Compared to traditional iron supplements, side effects like stomach issues are less common. However, long-term data is still limited.
The best evidence is for its use in iron deficiency and certain immunological effects. Many other applications, such as neuroprotection, are still being researched.
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