Lactoferrin
EVIDENCE: MODERATEAlso sold as: LF, bLF, bovine lactoferrin, lactotransferrin, milk iron-binding protein
Lactoferrin is an iron-binding protein commonly derived from milk. A 150-person trial of lactoferrin plus lactoperoxidase tablets found improved gum scores, but results were weaker in established periodontitis. Milk-derived preparations also raise allergy concerns.
Compiled by iSupplementReviews editorial team ·Updated 2026-10-10 · 5 sources
- Type
- Protein — immune/antimicrobial
- Studied dose
- 60 mg/day (positive trial, high-dose arm) down to 20 mg/day; periodontitis trial used 100mg ×3/day; liposomal pilot 180 mg/day
- Best form
- Bovine lactoferrin (bLF) with stated mg dose; liposomal forms claim better uptake — tablet trials used plain bLF
- Our rating
- MODERATE — Several human trials — limits in size, duration, or independence
What is lactoferrin?
Lactoferrin is an iron-binding protein found in milk, saliva, tears, and immune secretions. Supplements commonly use cow’s-milk lactoferrin. It can limit bacterial access to iron, and fragments have laboratory effects on bacterial membranes.
Other names and forms it’s sold as
- bLF / bovine lactoferrin: the standard supplement form, the one used in all the oral trials
- Liposomal lactoferrin: bLF wrapped in phospholipid fat; a pilot trial suggested better tissue delivery, mostly marketing beyond that
- Human/recombinant lactoferrin: exists in pharma research, not consumer supplements
- Lactoferricin: the antimicrobial peptide fragment, sold separately in some niche products
What is it claimed to do?
Suppress pathogenic bacteria, rebalance the oral microbiome, support gum health, and “boost” mucosal immunity. The gum-health claim has actual human data, both positive and null.
What does the research show?
| Claim | Evidence | Dose studied | Verdict |
|---|---|---|---|
| Improves gingival health | 150-subject trial (with LPO): gum scores significantly better vs placebo at 12 weeks; function scores improved | 60mg/day | Supported — modest, with LPO partner |
| Helps chronic periodontitis | 72-patient trial: LF reached gum fluid but clinical/bacterial markers didn’t separate from control | 100mg ×3/day | Weak — delivery confirmed, benefit not shown |
| Reduces probing depth | 12-subject liposomal pilot: probing depth significantly reduced, uncontrolled | 180mg/day | Preliminary |
| Direct antimicrobial vs gum pathogens | laboratory membrane disruption documented | — | Supported (lab mechanism) |
| Benefits as part of a rinse | LPO+lysozyme+LF rinse failed vs saline in plaque-regrowth model | — | One trial finding no benefit — mixed picture |
Why the studies differ
Lactoferrin studies have mixed gum-health findings: some showed improved inflammation measures, while others found no clinical improvement. They do not establish treatment of periodontitis.
Nakano 2019 found improved gum-inflammation scores versus placebo. Morinaga 2011 found a change in a biological marker but no clinical improvement in periodontitis patients. These findings suggest a possible maintenance benefit without establishing treatment of periodontitis. A separate 2004 trial found that a lactoperoxidase, lysozyme and lactoferrin rinse did not beat saline.
What dose was studied?
| Goal | Dose | Form/route | Duration |
|---|---|---|---|
| Gingival health (positive) | 60mg/day (+LPO 7.8mg) | Tablets | 12 weeks |
| Gingival health (low-dose arm) | 20mg/day (+LPO 2.6mg) | Tablets | 12 weeks |
| Periodontitis (no benefit found) | 100mg ×3/day (+LPO 1.8mg) | Tablets | 12 weeks |
| Probing depth (pilot) | 180mg/day liposomal | Tablets | 4 weeks |
Side effects
Very well tolerated; it’s a food protein. Rare digestive upset at high doses. Milk-allergic users: it is a bovine milk protein and US allergen law expects a “Contains: Milk” declaration on labels. Products that skip it are a labeling violation worth noting even though bLF allergenicity is low.
Drug interactions
None clinically meaningful. It binds iron rather than supplying it, so it doesn’t add to iron load; a theoretical additive effect with iron-chelating drugs is irrelevant at supplement doses.
Who should not take it?
People with strict milk-protein allergy (it’s derived from cow’s milk, the allergen flag labels should carry), and vegans by definition. Otherwise broadly safe, including in pregnancy trials (a lactoferrin gum trial in pregnant women is actively registered).
What the authorities say
GRAS for food use; unassessed for dental claims. Sold legally, claims unverified, but with more real human oral data than most supplement active ingredients.
What to know about lactoferrin
Lactoferrin combinations have some gum-maintenance evidence, but weaker findings in established periodontitis. The positive trial used about 60 mg daily. Compare both amount and combination, and check milk-allergy suitability rather than relying on a missing warning.
Frequently asked questions about Lactoferrin
Does lactoferrin help gum health?
The best trial says yes, modestly: a 150-subject trial found LF+LPO tablets (60mg+7.8mg/day) significantly improved gum inflammation scores and oral quality-of-life vs placebo at 12 weeks in healthy adults. In diagnosed periodontitis, a separate trial found gum-fluid lactoferrin rose but clinical markers didn't separate. Help for maintenance, not treatment.
How does lactoferrin work against bacteria?
Two mechanisms: it grabs iron that bacteria need to grow (starvation pressure), and its lactoferricin fragment directly disrupts bacterial membranes, including P. gingivalis and other gum-disease pathogens in lab work. Both are real; the question is always dose at the tissue.
Is lactoferrin a dairy allergen?
Yes. It's a cow's-milk protein, and supplement labels are required to flag milk allergens under US law (FALCPA). Several dental products containing lactoferrin have labels with no 'Contains' statement, a real labeling gap if you have a true milk allergy, though bLF is generally low-allergenicity.
Does swallowing lactoferrin reach the gums?
Partially. A trial measured bovine lactoferrin appearing in gum crevice fluid after oral dosing, so systemic uptake is real. But much of it is digested; the topical contact during chewing may matter as much as the swallowed fraction.
Is lactoferrin safe?
Clean safety record. It's GRAS-status in foods (infant formula fortification) and was well tolerated across trials at up to 300mg/day. Dairy allergy is the main flag; iron-overload conditions aren't a concern since it binds iron rather than supplying it.
References
- [1]LF+LPO tablets improved gingival index — 150-subject double-blind RCT (J Periodontal Res 2019)
- [2]LF+LPO tablets in chronic periodontitis — double-blind RCT, clinical parameters comparable to control (2011)
- [3]Liposomal bovine lactoferrin reduced probing depth in periodontal patients — pilot human trial (Biol Pharm Bull 2010)
- [4]Lactoferrin and oral diseases — status and perspective in periodontitis (Ann Stomatol 2012)
- [5]Antimicrobial host-protein rinse (LPO+lysozyme+LF) failed to inhibit plaque regrowth vs saline — J Periodontol 2004
Products we reviewed containing Lactoferrin
Based on recorded labels or seller-described formulas. Inclusion does not establish a match to the strains, preparations or amounts studied here; check each review's disclosure limits.