ModerateCaution
Iron
Lactoferrin binds iron and may influence iron absorption or handling; extra iron is inappropriate in iron overload.
Recommendation: Use ferritin, CBC, and transferrin saturation to guide iron supplementation.
Lactoferrin
Other ·Emerging evidence ·Reviewed May 2026
Lactoferrin is an iron-binding glycoprotein found in milk, colostrum, tears, saliva, and neutrophil granules. Oral bovine lactoferrin has emerging clinical evidence for reducing some respiratory and pediatric infection outcomes, but products and populations vary. It is usually well tolerated, but milk allergy, iron disorders, pregnancy, and immunocompromised states require individualized review.
What it's good for
The bottom line
Evidence rating emerging. Most-documented uses: may reduce respiratory infection risk in some trials, may support gut immune barrier function, may support antimicrobial defense at mucosal surfaces. 3 sources indexed (2014–2025), with 3 interaction records on file.
The science
How it works, mechanistically.
Core mechanism
Lactoferrin binds iron, limiting availability to some microbes, and can interact with microbial membranes, viral attachment processes, intestinal barrier signaling, and immune cell cytokine responses. It may support gut immune defenses and mucosal immunity while also influencing iron handling depending on iron saturation and host status. Effects are context-dependent and not a substitute for antimicrobial therapy or vaccination.3,1
Class
Iron-binding immune glycoprotein
Found in food
Human milk, Cow's milk, Colostrum
Low-status signs
No standard dietary lactoferrin deficiency syndrome is diagnosed clinically
Dosing
Dosing & protocol.
Common range
100-300 mg/day for general immune support; higher doses such as 600 mg/day have been used in some clinical studies
Recommended form
Bovine lactoferrin capsule or powder with clear dose and allergen labeling
Can be taken with or without food. Some users prefer between meals, but clinical necessity is not established.1,2
Forms
Forms & what to buy.
Ranked by evidence and value.
Bovine Lactoferrin Capsule Recommended
Most common supplement form with clinical study precedent. Take with or without food.
Apolactoferrin
Lower iron saturation form, often marketed for antimicrobial support. Take as labeled.
Colostrum with Lactoferrin
Contains multiple milk immune proteins; lactoferrin dose may be low or undisclosed. Avoid in milk allergy.
Cost
What it actually costs.
Real-world pricing across three quality tiers. Assumes Bovine lactoferrin capsule.
BudgetBest value
$11 /mo
$0.35 per dose
Mid
$26 /mo
$0.85 per dose
Premium
$54 /mo
$1.80 per dose
Apolactoferrin and high-dose products are usually premium priced. Updated 2026-06-04.
Goals
Goal-based dosing.
Respiratory Infection Support
Timing: Divided or once daily
Not a treatment for serious infection; seek care for severe symptoms.
Gut Immune Barrier Support
Dose: 100-300 mg/day3
Timing: With or without food
May pair with microbiome support; evidence varies.
Lab work
Markers to track.
What to test, the optimal window inside the conventional range, and how long a response takes.
Ferritin
May influence iron handling in selected settings, but is not a stand-alone iron treatment.3
Optimal
30–100 ng/mL
Conventional
15–150 ng/mL
Responds in
8-12 weeks if used for iron-related goals
15optimal150
Interpret ferritin with CBC, transferrin saturation, CRP, and symptoms.
CBCTransferrin saturationSerum ironCRP
Why people use it
Symptoms it's matched to.
Where this appears in the symptom-to-supplement map, ranked by relevance.
Frequent colds
52% relevance
May support mucosal immune defenses and reduce respiratory infection risk in pooled RCTs.3
ImmuneEmerging evidenceBovine lactoferrin capsule
Does not replace vaccination or medical care.
Gut immune sensitivity
38% relevance
May support intestinal barrier and microbial defense mechanisms.3
DigestiveEmerging evidenceApolactoferrin
Persistent GI symptoms need evaluation.
Low iron with poor tolerance of iron
32% relevance
May influence iron handling, but is not a direct replacement for iron when deficiency is present.3
EnergyInsufficient evidenceClinician-selected lactoferrin
Use labs to guide iron deficiency care.
Safety
Full safety detail.
Side effects
- Nausea
- Constipation
- Diarrhea
- Abdominal discomfort
- Rash or allergy in milk-sensitive users
Interactions
Interaction records.
InfoSynergy
Probiotics
Both may support gut and mucosal immune defenses.
Recommendation: Introduce gradually if GI symptoms occur.
InfoSynergy
Vitamin C
Vitamin C may support immune function and iron absorption while lactoferrin supports mucosal defense.
Recommendation: Use moderate vitamin C doses; monitor iron status if treating deficiency.
Sources
Sources, by evidence tier.
Numbered references. Citations throughout the page link here.
Meta-analyses & systematic reviews
2- 1Efficacy of lactoferrin supplementation in pediatric infections: a systematic review and meta-analysisNeeds reviewNo linkGao Y et al. · Frontiers in Pediatrics · 2025
Pediatric RCTs suggested possible infection-related benefits with heterogeneity.
- 2Lactoferrin reduces the risk of respiratory tract infections: A meta-analysis of randomized controlled trialsNeeds reviewNo linkAli AS et al. · Clinical Nutrition ESPEN · 2021
Pooled RCTs found reduced odds of respiratory infections with lactoferrin supplementation.
Reviews & position papers
1- 3Nutraceutical and Health-Promoting Potential of Lactoferrin, an Iron-Binding Protein in Human and AnimalNeeds reviewNo linkSiqueiros-Cendon T et al. · International Journal of Molecular Sciences · 2014
Review summarized antimicrobial, immune, and iron-binding mechanisms of lactoferrin.
Keep exploring
Deep dives & adjacent profiles.
This page is educational. Do not start, stop, or change a supplement or medication based on it without checking with a qualified healthcare professional.
Use this with your stack
Lactoferrin in NutriStack.
Add it to your stack, see how it interacts with everything else you take, and get a Stack Score that updates the moment it does.