June 14, 2026, 6:51 am | Read time: 4 minutes
Anyone exploring supplements for the immune system, gut health, or iron deficiency will eventually come across lactoferrin. This protein is increasingly promoted as an alternative to traditional iron supplements and is said to have anti-inflammatory and immune-modulating properties. But what is behind these claims–and what does the science say?
What is Lactoferrin?
Lactoferrin is a naturally occurring protein from the transferrin family. It is found in breast milk, saliva, tears, and other bodily secretions. Its most important feature: It can bind and transport iron particularly effectively.1
Additionally, lactoferrin plays a role in the innate immune system. By binding free iron, it deprives potential pathogens of an important nutrient. The protein is also credited with antibacterial, antiviral, and anti-inflammatory properties.
For supplements, so-called bovine lactoferrin is usually used, which is derived from cow’s milk and is structurally very similar to human lactoferrin.2
Uses of Lactoferrin Supplements
Most people take lactoferrin for its presumed benefits on iron metabolism. The supplement is particularly interesting for those who poorly tolerate traditional iron supplements or do not achieve satisfactory improvements in their blood levels despite taking iron.3
It is also often promoted for the following purposes:
- Supporting the immune system
- Promoting gut health
- Reducing inflammation
- Support during pregnancy
- General health and longevity goals
However, the scientific evidence varies greatly depending on the application. While the data for iron deficiency is relatively strong, many other uses are significantly less researched.
At the same time, the various applications should not be evaluated equally. While the effect of lactoferrin on iron metabolism has been investigated in several clinical studies and meta-analyses, much of the claims around the immune system, gut health, acne, or anti-aging are still based on smaller human studies, lab tests, or animal models. Larger, high-quality human studies are still lacking for many of these applications.4
How Does Lactoferrin Work in the Body?
Unlike traditional iron supplements, lactoferrin itself provides only relatively small amounts of iron. Its effect seems to be based more on regulating iron metabolism.
Researchers suspect that lactoferrin influences inflammatory processes and thereby improves iron utilization in the body. Particularly relevant is the inflammatory marker interleukin-6 (IL-6), which is closely linked to the hormone hepcidin. Hepcidin regulates iron absorption and can lead to reduced iron availability in cases of chronic inflammation.
Studies also show that lactoferrin can influence various immune cells and reduce pro-inflammatory messengers.5 The protein could also be relevant for gut health. Research suggests that lactoferrin can promote the growth of certain beneficial gut bacteria while inhibiting potentially harmful germs.
Another interesting mechanism involves iron binding itself. Many bacteria need iron to grow and reproduce. Since lactoferrin binds free iron very effectively, it can deprive pathogens of this important nutrient. Researchers see this as a possible explanation for the antibacterial and antimicrobial properties of the protein observed in lab studies.6
Rudi Völler Relies on This Dietary Supplement to Stay Healthy
The 8 Best Probiotic Foods for a Gut-Friendly Diet
Lactoferrin vs. Iron Supplements: What’s the Difference?
For iron deficiency, supplements like ferrous sulfate are standard but often cause side effects such as nausea or constipation. Current meta-analyses reveal an interesting detail: Although the body absorbs slightly less iron from lactoferrin than from ferrous sulfate, hemoglobin and ferritin levels (iron stores) in the blood still increase effectively. This is likely because lactoferrin more efficiently “unlocks” iron utilization through its anti-inflammatory effects, rather than simply flooding the body with high doses of iron.7
It’s important to note: This does not mean that lactoferrin can generally replace iron supplements. Especially in cases of severe iron deficiency or anemia, the medically recommended iron therapy remains the necessary standard.
Also interesting: This is the supplement Rudi Völler relies on to stay healthy
Dosage, Intake, and Side Effects
In clinical studies, doses between 100 and 250 milligrams per day were typically used. Those looking for lactoferrin supplements on the market will find that most manufacturers opt for a dosage between 200 and 400 milligrams. An officially recommended daily dose does not yet exist. Higher amounts have also been used for specific applications. Overall, lactoferrin is considered well-tolerated. The European Food Safety Authority (EFSA) classifies bovine lactoferrin as safe at intended consumption levels.8
Possible side effects may include:
- mild gastrointestinal discomfort
- nausea
- abdominal pain
- rare allergic reactions
People with a cow’s milk protein allergy should be cautious, as most products are derived from cow’s milk.