What Is Lactoferrin? The Little-Known Immune Protein Explained

Lactoferrin in Five Sentences

Lactoferrin is an immune protein and iron transporter that is around 160 million years old and has remained almost unchanged across all mammals [1].

The protein is found in the breast milk of every mammal: at concentrations of 5 to 7 grams per liter in colostrum and 1 to 2 grams per liter in mature breast milk [2].

For dietary supplements, lactoferrin is obtained from cow’s milk. It binds to the same receptors on human cells as the body’s own lactoferrin and stimulates the body’s own production [3, 4].

It is the gentlest and at the same time most effective iron regulator there is, while also helping to defend against bacteria and viruses.

It acts at the body’s interfaces with the outside world: in tears, saliva, nasal mucus, the intestinal mucosa and white blood cells.

What Is Lactoferrin? A Special Protein Explained

The name already tells us the most important part: “Lacto” refers to milk, while “ferrin” refers to iron transport, just like the related protein transferrin in the blood.

Lactoferrin naturally occurs in breast milk, among other places, and is particularly concentrated in colostrum. Lactoferrin is a protein consisting of two halves. Each of these halves can bind iron very tightly in the form of an iron atom.

Two characteristics make it particularly special.

First, it binds iron around 300 times more tightly than its relative transferrin and retains it even in acidic environments, precisely where inflammation and infection occur [1]. Lactoferrin can also bind more than five times its original iron load in addition.

Second, the molecule has changed remarkably little across all mammals over millions of years. This is why lactoferrin from cow’s milk also works in humans: it is absorbed in the gut via the same receptor as the body’s own lactoferrin [3].

And there is something else that may come as a surprise. In a randomized, placebo-controlled study conducted over twelve months, taking bovine lactoferrin increased the body’s own lactoferrin production, with a significantly greater increase at 3 grams per day than at 1.5 grams [4]. Normally, the body’s own production decreases with age. Supplementation reverses this trend

A note on terminology: Although lactoferrin is chemically a protein, simply referring to it as such can be misleading. Its purpose is not to supply amino acids, but to perform specific functions within the immune system and iron metabolism. The terms immune protein and iron transporter therefore describe it more accurately.

Where Does Lactoferrin Naturally Occur?

As a protein naturally produced by the body, lactoferrin is found in various bodily fluids and secretions. Tear fluid contains between 1.5 and 2.2 milligrams per milliliter. Particularly high concentrations are found in breast milk: 5 to 7 milligrams per milliliter in colostrum and 1 to 3 milligrams per milliliter in mature breast milk.

Lactoferrin is also found in saliva, nasal secretions and the mucous membranes of the urogenital tract. Its concentration in blood plasma is normally low. During inflammation, however, neutrophils can release up to 200 times more lactoferrin [1, 5]. The body therefore uses lactoferrin specifically where defense is needed. This means it is present at exactly those interfaces where the immune system comes into contact with bacteria, viruses and other potential pathogens.

What Functions Does Lactoferrin Have in the Body?

Lactoferrin and Iron Metabolism: Getting Iron Where It Is Needed

Many people are familiar with the problem: they have an iron deficiency, take iron supplements, their stomach reacts badly, yet their iron levels barely improve.

The reason is often low-grade inflammation. As soon as the immune system becomes active, the body interprets this as a possible infection. Because bacteria need iron, the body starts locking it away.

The signal responsible for this is interleukin-6, which stimulates the liver to release hepcidin. Hepcidin then closes the pathways through which iron is absorbed in the gut and released from the body’s stores [6].

This is precisely where lactoferrin comes into play. It reduces interleukin-6, which lowers hepcidin levels, allowing these pathways to reopen so that existing iron can move to where it belongs.

Lactoferrin itself supplies very little iron. Instead, it helps the body use its own iron more effectively [7].

Lactoferrin and the Immune System: Defending Against Bacteria and Viruses

Lactoferrin attacks bacteria in several ways at the same time. It deprives them of the iron they need to grow. Its positively charged region can disrupt the membranes of intestinal pathogens such as E. coli and Salmonella. It also prevents bacteria from forming biofilms and attaching themselves to mucous membranes [8].

In the case of viruses, lactoferrin can block binding sites on the body’s cells that viruses would otherwise use to attach themselves, including those used by common cold, influenza, rotavirus and norovirus viruses [9].

At the same time, lactoferrin distinguishes between friend and foe: Bifidobacteria and lactic acid bacteria can even grow better in the presence of lactoferrin [10].

Lactoferrin and Inflammation: Slowing Down Inflammatory Processes

The third area in which lactoferrin acts involves the regulation of inflammatory processes, which are closely linked to immune system activity.

Lactoferrin reduces the inflammatory signaling molecules interleukin-6 and TNF-alpha and inhibits NF-κB, one of the central regulators of inflammation [11].

A meta-analysis found a significant reduction in interleukin-6 in adults, while no significant difference was observed for the inflammatory marker CRP [12].

The effect is therefore measurable, but not reflected in every inflammatory marker.

Lactoferrin from Cow’s Milk: How Is the Protein Obtained?

Cow’s milk naturally contains only a fraction of the lactoferrin found in human breast milk, and much of this small amount is lost during conventional heat treatment.

So lactoferrin is not something you simply obtain by drinking milk. Instead, the protein is specifically extracted from milk.

To do this, it is gently separated from skimmed milk or whey without the use of heat or acid, as both can damage the three-dimensional structure of the molecule and therefore affect its functionality.

There is a simple reason why cow’s milk is used as the source: It is available in large quantities, and bovine lactoferrin is so similar to human lactoferrin that it can bind to the same receptor [3].

Quality: How Can You Recognize High-Quality Lactoferrin?

One of the key indicators of quality is whether the protein retains its native structure.

Lactoferrin works by binding to receptors on human cells. However, lipopolysaccharides, or LPS, can bind to the same site. LPS are components of bacterial cell walls that occur in raw milk and, if processing is inadequate, may end up in the finished powder [13].

The degree to which the raw material comes into contact with bacteria depends, among other things, on freshness, transportation times and processing.

When a lactoferrin molecule is occupied by LPS, it can no longer bind to the cell. LPS itself is also a potent trigger of inflammation.

An independent laboratory analysis of several commercially available products found considerable differences. Only two of the products tested had no detectable endotoxin levels, while most showed contamination, in some cases at considerably higher levels [14].

The origin of the milk and how quickly it is processed are therefore crucial. The fresher the milk and the shorter the journey, the fewer bacteria and, consequently, the lower the potential LPS load.

• Fresh raw material from the region: The longer milk is transported or stored, the more time bacteria have to multiply.
• Control over the entire production process: Only companies that control every step from the cow to the finished powder can optimize each stage for purity.
• Gentle extraction: As a sensitive protein, lactoferrin reacts to processing conditions. Gentle extraction without excessive heat, acid or alkali helps preserve its native structure.
• Two analytical methods instead of one: The combination of HPLC and heparin affinity chromatography is considered the gold standard for determining lactoferrin content and purity [15].

Taking Lactoferrin: How Much, When and for Whom?

The following information is based on the cited studies and many years of practical experience in clinical psychoneuroimmunology.

General well-being: 400 to 600 mg per day
Lower range for a noticeable effect.

Iron balance, recovery, skin and hair: 1,200 mg per day
The range used in most studies.

Acute infections, intestinal problems and elevated inflammatory markers: 3,000 mg per day
Until symptoms improve, then return to the maintenance dose.

When to take it: on an empty stomach or between meals
Do not take with a large meal.

Overdosing is considered difficult: Lactoferrin is a naturally occurring protein that the body can digest like other proteins. Even 3 grams per day for an entire year showed no adverse effects in studies [16].

It has also been studied in particularly sensitive populations, including pregnant women, premature infants weighing less than 1,500 grams and infants from the first day of life, without serious adverse effects being reported [17, 18].

Before starting supplementation, it can be useful to have blood tests for ferritin, hemoglobin, transferrin saturation and hs-CRP. This provides an indication of your baseline levels and whether inflammation may be involved.

What Role Does Lactoferrin Play at Different Stages of Life?

Infancy

Colostrum provides lactoferrin in gram quantities. The infant gut has specific binding sites for lactoferrin, allowing it to reach the gut undigested and even be absorbed into the bloodstream [3].

Lactoferrin inhibits pathogens while also supporting bifidobacteria, which are involved in establishing the early gut microbiota [10].

Formula-Fed Infants

Cow’s milk contains relatively little lactoferrin, and some of it is lost through heat during the production of infant formula.

In studies, infants receiving formula supplemented with lactoferrin experienced fewer respiratory and diarrheal illnesses [20].

After Weaning

Between six months and three years of age, iron deficiency is the most common nutrient deficiency worldwide. At the same time, this is an important stage of brain development.

Kindergarten and School Age

During kindergarten and school years, the immune system is repeatedly challenged through regular contact with different pathogens.

Infections are associated with inflammatory processes, which in turn can affect iron metabolism.

Women of Childbearing Age

The body regularly loses iron through menstruation. Adequate iron stores are particularly important when considering a potential pregnancy.

Adults and Older People

The body’s own lactoferrin production decreases with age [4].

At the same time, immune processes change as we grow older, while chronic low-grade inflammation becomes increasingly relevant [21].

Frequently Asked Questions

Is Lactoferrin the Same as Colostrum?

No. Colostrum is the first milk produced after birth and contains many different substances in addition to lactoferrin.

A colostrum powder therefore provides only a fraction of the amount of lactoferrin found in a pure lactoferrin supplement, and its lactoferrin content can vary considerably.

What Role Does Lactoferrin Play in the Immune System?

Lactoferrin is studied for its diverse functions within the immune system.

It occurs naturally in breast milk, tears, saliva and mucous membranes, among other places, meaning it is present at many of the body’s interfaces with the outside world.

Research examines, among other things, its interactions with iron, microorganisms and inflammatory processes [3, 5, 11, 12].

Can People with Lactose Intolerance Take Lactoferrin?

Generally, yes. Lactoferrin is a protein and contains virtually no lactose.

However, people with a milk protein allergy should avoid it.

How Much Lactoferrin Should You Take Per Day?

Lactoferrin has been studied at various dosages. Many studies use amounts in the range of 100 to 400 mg of lactoferrin per day.

The effectiveness of lactoferrin may vary depending on its intended use.

Our Hero Lactoferrin contains 400 mg of lactoferrin per capsule, placing it at the upper end of this commonly studied range.

Can Lactoferrin Be Taken Together with Iron?

It may be preferable to start with lactoferrin alone and check iron levels again after eight to twelve weeks.

In cases of severe anemia, a doctor should determine whether additional iron supplementation is required.

Lactoferrin should not be used as a substitute for medically recommended treatment for iron deficiency.

Does Lactoferrin Work Immediately?

For acute gastrointestinal complaints, effects may occur within a few days.

When it comes to iron balance, it may take weeks or months, as the body’s iron stores cannot be replenished overnight.

Is Lactoferrin Suitable During Pregnancy?

Lactoferrin has been studied in several trials involving pregnant women without serious adverse effects being reported [17].

Nevertheless, supplementation during pregnancy should always be discussed with the doctor or midwife providing care.