Lactoferrin Drug Interactions, Uses, Effectiveness, Safety & More

Lactoferrin is a protein that binds to iron. It is found naturally in many body fluids, including breast milk (especially colostrum, the first milk after birth), tears, saliva, nasal and intestinal secretions, and more. It is also released by certain white blood cells called neutrophils as part of the body's natural defenses.

Most supplements are made from cow's (bovine) milk. Lactoferrin can also be produced using recombinant technology, including from rice. It comes mostly as capsules, tablets, or powders, and is sometimes added to infant formulas and other functional foods.

People take lactoferrin for a range of reasons, such as supporting the immune system, helping with iron levels, improving gut health, and fighting certain infections.

Lactoferrin's name comes from its ability to bind iron. By holding onto iron, it may make it harder for some bacteria to grow, since many bacteria need iron to multiply. This is one proposed reason it may have antimicrobial effects.

In laboratory studies, lactoferrin also appears to interact directly with bacteria, viruses, and fungi, and may help regulate parts of the immune system and reduce inflammation. It may also affect how the gut absorbs iron and supports the balance of helpful gut bacteria.

It is important to know that most of these mechanisms come from laboratory or animal research. How well they apply to people taking supplements is still being studied.

Lactoferrin appears to be generally well tolerated when taken by mouth for short periods. However, long-term safety data are limited, and the quality of supplements can vary between products.

Because most supplements are made from cow's milk, people with a milk or dairy allergy should be cautious or avoid it, as products may contain milk proteins.

For pregnancy, some studies have used lactoferrin, but overall safety is not fully established. Use it only if your doctor recommends it. For breastfeeding, lactoferrin is naturally present in breast milk, but whether taking supplements is safe and helpful is not well studied, so caution is advised.

Give lactoferrin to infants and children only under the guidance of a pediatrician. If you have a chronic medical condition or take medications, check with your pharmacist or doctor first.

Lactoferrin is usually well tolerated. When side effects occur, they are most often mild and may include digestive symptoms such as constipation, diarrhea, loss of appetite, stomach upset, or a feeling of fullness.

Less commonly, people have reported skin rash, chills, or tiredness. Allergic reactions are possible, especially in people sensitive to milk. Stop use and seek medical care if you have signs of a serious allergic reaction, such as trouble breathing, swelling of the face or throat, or hives.

There is no official standardized dose of lactoferrin, and the right amount can depend on the product, the form, and the reason for use. Doses used in research have varied widely.

The best approach is to follow the directions on the product label and not exceed the recommended amount. Because products differ in strength and quality, look for brands that use third-party testing when possible.

Always check with your pharmacist or doctor before starting lactoferrin, especially for children, during pregnancy or breastfeeding, or if you have a health condition.