The Latest Lactoferrin Research: What Have Scientists Discovered Recently?

If you've been following the science behind lactoferrin, you'll know it's a protein with a rather impressive CV. Found naturally in breast milk, saliva, tears and other bodily fluids, lactoferrin plays a role in our immune system's first line of defence. And although scientists have been studying it for decades, there's still plenty we're learning about what it can do. And while lactoferrin is best known for its immune-supporting properties, researchers are discovering that there's much more to its story.

 

Over the past years, new studies have explored how lactoferrin interacts with immune cells, influences our gut bacteria and even how its antibacterial abilities developed millions of years ago. Some of these findings are particularly exciting because they're beginning to move beyond laboratory experiments and into human clinical trials.

 

So, what have scientists been discovering about lactoferrin?

 

1. Could lactoferrin support our immune system as we age?

 

As we get older, our immune system naturally changes. Certain immune responses become less efficient, while low-grade inflammation can become more common. This is one reason researchers are interested in ingredients that might help support healthy immune function later in life.

 

A 2026 study published in the British Journal of Nutrition investigated whether taking lactoferrin supplements could influence immune responses in healthy adults aged 50 and over.

 

In this randomised controlled trial, 103 participants were assigned to receive either 200 mg or 600 mg of lactoferrin daily, or a placebo, for four weeks. Researchers measured inflammatory markers, immune cell populations and how participants' immune cells responded to respiratory viruses in laboratory tests.

 

Interestingly, those receiving the higher dose showed increases in certain T-cell populations, which play an important role in adaptive immunity. Their immune cells also produced less of the inflammatory signalling molecule IL-6 when exposed to rhinovirus in the laboratory.

 

The researchers observed other changes in inflammatory markers and immune cell populations, although not every measurement improved and some differences were between the two lactoferrin doses rather than against placebo.

 

Why does this matter? It suggests lactoferrin may influence how our immune system responds to challenges, rather than simply increasing immune activity across the board.

 

However, the study didn't measure whether participants caught fewer colds or recovered faster from infections. Larger and longer clinical trials will be needed to establish whether these changes translate into everyday health benefits.

 

2. Scientists have uncovered how lactoferrin's antibacterial powers evolved

 

Here's something you probably didn't expect: in 2026, researchers travelled millions of years back in evolutionary history to understand how lactoferrin developed its antibacterial abilities. Well, not literally. But they did something almost as impressive.

 

In a study published in PLOS Biology, scientists reconstructed ancient versions of lactoferrin using evolutionary sequence analysis. This allowed them to investigate how a small region of the protein, known as lactoferricin, changed throughout mammalian evolution.

 

Lactoferricin is particularly interesting because it can interact with bacterial membranes and, under certain conditions, damage them. By recreating ancestral versions of this peptide and testing them against bacteria, the researchers discovered that changes in its amino acid composition gradually strengthened its antibacterial activity.

 

Certain changes made the peptide more positively charged, helping it interact with negatively charged bacterial surfaces. Other changes improved its ability to disrupt bacterial membranes. The team also identified a rapidly evolving position in lactoferricin that could substantially influence its antibacterial potency.

 

It's a fascinating discovery because it shows that lactoferrin's role in immune defence has been shaped by millions of years of evolution. Although this was laboratory research rather than a human clinical trial, it offers valuable insight into how our bodies have developed natural ways to defend themselves against microorganisms.

 

3. Lactoferrin and gut health: What's the latest evidence?

 

Our gut is home to trillions of microorganisms, many of which play important roles in digestion, metabolism and immune function. Scientists are increasingly interested in whether lactoferrin can influence this microbial community.

 

In 2026, researchers published a randomised, double-blind trial investigating the effects of human and bovine lactoferrin on the gut microbiome of 66 healthy adults.

 

Participants received different lactoferrin formulations for 28 days, and researchers analysed their gut bacteria and short-chain fatty acids, compounds produced when gut microorganisms ferment certain nutrients.

 

The findings were interesting. Although overall microbial diversity remained relatively stable, the researchers observed changes in the abundance of bacterial groups.

 

Human lactoferrin was associated with increases in some bacteria considered potentially beneficial, including Faecalibacterium and Lachnospira at the higher dose. Bovine lactoferrin was associated with changes in other bacterial groups and increased concentrations of certain short-chain fatty acids. These compounds are particularly interesting because some, including butyrate, play important roles in maintaining the intestinal environment.

 

However, changes in bacterial abundance don't necessarily mean that someone's gut health has improved. The researchers described these findings as exploratory, meaning further studies are needed to understand their clinical significance. Still, the results add to growing interest in lactoferrin's relationship with the gut microbiome.

 

4. Lactoferrin and iron: More complicated than we thought?

 

 

One of lactoferrin's defining characteristics is its ability to bind iron. In fact, that's where its name comes from: lacto, referring to milk, and ferrin, referring to iron.

 

Iron is essential for many processes in the body, including red blood cell production and immune function. It's also needed by many bacteria, which is why lactoferrin's iron-binding abilities are so interesting.

 

In July 2026, researchers published a pilot clinical trial investigating whether lactoferrin-enriched yoghurt could influence iron status in women with gestational diabetes. Fifty participants were assigned to receive either lactoferrin-enriched yoghurt or a control yoghurt for eight weeks, alongside their prescribed iron supplementation.

 

The researchers found that ferritin, a marker of the body's iron stores, remained relatively stable in the lactoferrin group but declined in the control group. Interestingly, the researchers also observed changes in certain gut bacteria, suggesting lactoferrin may influence more than one biological pathway.

 

However, this was a relatively small study, and all participants were receiving additional iron. We therefore can't conclude that lactoferrin alone improves iron status or prevents iron deficiency.

 

It's another example of how scientists are beginning to investigate lactoferrin's effects in specific clinical settings.

 

5. What have we learned about lactoferrin's wider health benefits?

 

With so many potential applications being investigated, it's easy to get carried away with the possibilities. But what does the broader evidence tell us?

 

A 2025 review published in Nutrients brought together research examining lactoferrin's roles in immune regulation, antimicrobial defence, inflammation and gastrointestinal health.

 

The authors highlighted just how varied lactoferrin's biological functions appear to be. Alongside binding iron, it can interact with microorganisms, influence immune signalling and potentially affect the composition of microbial communities.

 

However, the review also emphasised that clinical findings have been mixed, particularly when comparing different conditions, doses and populations.

 

This is an important reminder that understanding how a protein works in the body isn't quite the same as demonstrating that taking it as a supplement will improve a particular health outcome. And that's precisely why continued research matters.

So, what's next for lactoferrin?

 

If there's one thing the research from 2025 and 2026 has shown us, it's that lactoferrin is far more than just an iron-binding protein.

 

We're learning more about how it interacts with immune cells, influences microbial communities and contributes to the body's natural defence mechanisms. And with newer human clinical trials beginning to investigate these effects, scientists are gradually building a clearer picture of where lactoferrin might be useful.

 

There's still plenty to discover, particularly when it comes to optimal doses, long-term effects and whether promising biological changes translate into noticeable health benefits.

 

At Leapfrog Remedies, lactoferrin is an ingredient across all of our formulations - IMMUNE, FOCUS, SNOOZE and DAILY - and it's a protein we've been long championing. We look forward to new research emerging.

 

After all, for something our bodies have been producing for millions of years, lactoferrin still seems to have plenty left to teach us.

 

Reference list

 

Berthon, B.S., Williams, E.J., Williams, L.M., Budden, K.F., Hiles, S.A., Bartlett, N.W. and Wood, L.G. (2026). Oral lactoferrin reduces systemic inflammation, enhances anti-viral responses and modulates immune cell profiles: A randomised controlled trial in healthy, older adults. British Journal of Nutrition, [online] 135(9), pp.929–943. doi:10.1017/s000711452610631x.

 

Goitre, I., Ponzo, V., Ferrocino, I., Franciosa, I., Valla, A., Lucatello, B.G., Ragazzoni, F., Deandrea, M., Rovei, V., Stefanidou, E.M., Canuto, E., Marozio, L., Mengozzi, G., Crisà, E., Sapino, A. and Bo, S. (2026). Effects of lactoferrin-enriched dairy product on iron status in women with gestational diabetes mellitus. npj Science of Food. [online] doi:10.1038/s41538-026-00998-y.

 

Peterson, R. D, van der Made, J., Donovan, S.M., Wang, M., Dilger, R.N., Kaplan, N. and Clark, A.J. (2026). Effects of human lactoferrin (effera®) at two doses versus bovine lactoferrin on the adult gut microbiome and fecal short-chain fatty acids: A randomized, double-blind trial. Journal of dietary supplements, [online] 23(3), pp.415–439. doi:10.1080/19390211.2026.2673021.

 

Rizzi, M., Manzoni, P., Germano, C., Quevedo, M.F. and Sainaghi, P.P. (2025). Lactoferrin, a natural protein with multiple functions in health and disease. Nutrients, [online] 17(21), p.3403. doi:10.3390/nu17213403.

 

Sil, T., Kowalski, C.H., Scamfer, S., Copeland, N. and Barber, M.F. (2026). Retracing the origin and evolution of a cryptic antimicrobial peptide within mammalian lactoferrin. PLOS Biology, 24(8), p.e3003932. doi:10.1371/journal.pbio.3003932.