Peptide Comparison
Lactoferricin BvsThymalin
A 25-amino-acid antimicrobial peptide fragment derived from bovine lactoferrin by pepsin cleavage, featuring a twisted antiparallel beta-sheet structure with broad-spectrum bactericidal activity, anti-biofilm properties, and emerging anticancer potential through selective membrane disruption mediated by the critical RRWQWR motif
Russian thymic peptide complex that rejuvenates immune function and supports healthy aging
At a Glance
Quick
comparison
Dose Range
Lactoferricin B
1–10 mg
Thymalin
5–10 mg
Frequency
Lactoferricin B
Multiple times daily
Thymalin
Once daily
Administration
Lactoferricin B
Oral (research — resistant to gastric digestion)
Thymalin
Intramuscular injection
Cycle Length
Lactoferricin B
4-6 weeks
Thymalin
4-6 weeks
Onset Speed
Lactoferricin B
Rapid (hours to days)
Thymalin
Moderate (1-2 weeks)
Evidence Level
Lactoferricin B
Moderate human trials (Phase 1-2)
Thymalin
Limited human trials
Efficacy
Benefit
ratings
Fighting Germs
Cancer Cell Targeting
Immune Support
Immune Restoration
Longevity Support
Disease Prevention
Technical Data
Compound
specifications
Lactoferricin B
Molecular Formula
Approximately C142H224N46O34S2 (varies slightly by reported sequence)
Molecular Weight
~3,126 Da (25-amino-acid bovine lactoferricin B)
Half-Life
Plasma half-life: minutes (proteolytic degradation); gastrointestinal persistence: hours (relative resistance to trypsin and chymotrypsin compared to unstructured peptides); beta-sheet structure and disulfide bond provide moderate protease resistance
Bioavailability
Generated endogenously during gastric digestion of dietary lactoferrin; partially resistant to further proteolytic degradation due to beta-sheet structure and disulfide bond; systemic bioavailability limited by intestinal proteases and hepatic metabolism
CAS Number
146897-68-9
Thymalin
Molecular Formula
Complex mixture; active dipeptide EW: C16H19N3O5
Molecular Weight
Polypeptide complex; components 250-1000 Da; active dipeptide EW ~321 Da
Half-Life
Not precisely characterized for complex; immune effects persist weeks post-administration
Bioavailability
High via intramuscular or subcutaneous injection
CAS Number
63958-90-7
Protocols
Dosing
tiers
Lactoferricin B
Thymalin
Applications
Best
suited for
Lactoferricin B
Research into dairy-derived antimicrobial peptides and natural innate defense mechanisms
Lactoferricin B is particularly well-suited for individuals focused on research into dairy-derived antimicrobial peptides and natural innate defense mechanisms. Research and clinical experience suggest meaningful benefits in this area when used as part of a comprehensive treatment approach.
Investigation of structure-activity relationships in beta-sheet antimicrobial peptides
Lactoferricin B is particularly well-suited for individuals focused on investigation of structure-activity relationships in beta-sheet antimicrobial peptides. Research and clinical experience suggest meaningful benefits in this area when used as part of a comprehensive treatment approach.
Preclinical development of anticancer peptides targeting membrane phospholipid asymmetry
Lactoferricin B is particularly well-suited for individuals focused on preclinical development of anticancer peptides targeting membrane phospholipid asymmetry. Research and clinical experience suggest meaningful benefits in this area when used as part of a comprehensive treatment approach.
Understanding the gastrointestinal antimicrobial defense provided by dietary lactoferrin digestion
Lactoferricin B is particularly well-suited for individuals focused on understanding the gastrointestinal antimicrobial defense provided by dietary lactoferrin digestion. Research and clinical experience suggest meaningful benefits in this area when used as part of a comprehensive treatment approach.
Thymalin
Aging Adults Seeking Immune Support
Thymalin is especially valuable for people over 55 whose thymus gland has naturally shrunk with age. By stimulating thymic function, it helps restore the immune training center that your body relies on to fight infections and stay healthy.
Longevity and Anti-Aging Protocols
Clinical studies tracking patients for 6-8 years showed Thymalin reduced mortality by 2.0-2.1-fold. Combined with Epitalon, the mortality reduction reached an impressive 4.1-fold, making this combination one of the most studied longevity peptide protocols.
Seasonal Illness Prevention
Research shows Thymalin cuts respiratory infection rates by 2.0-2.4-fold. A short 10-day course before cold and flu season can significantly boost your immune defenses for months afterward.
Safety Profile
Side
effects
Lactoferricin B
Common
- Mild GI discomfort
- Bitter taste
- Local irritation (topical use)
- Mild flatulence
Uncommon
- Allergic reaction in milk-sensitive individuals
Serious
- Hemolytic activity at high concentrations
Thymalin
Common
- No side effects in most patients
- Mild injection site reaction
Uncommon
- Transient low-grade fever
- Mild flu-like symptoms
- Temporary headache
Serious
- Severe allergic reaction
Research Status
Safety
& evidence
Lactoferricin B
Evidence Level
Moderate human trials (Phase 1-2)
FDA Status
Research compound
Safety Overview
Lactoferricin B is a 25-amino acid peptide fragment of human lactoferrin with a well-documented natural history—derived from a dietary protein that humans consume in breast milk and dairy products. Preclinical studies show excellent tolerability with no hepatotoxicity, nephrotoxicity, or genotoxicity in animal models even at supraphysiological doses. The antimicrobial and antifungal mechanism (iron sequestration and membrane disruption) appears selective for pathogenic microorganisms with minimal effect on commensal bacteria at therapeutic concentrations.
Contraindications
- xKnown allergy to bovine milk proteins or lactoferrin — cross-reactivity possible
- xPregnancy and breastfeeding — insufficient safety data for therapeutic-dose lactoferricin supplementation
- xActive hemolytic conditions — at higher concentrations lactoferricin shows some hemolytic activity that may worsen hemolysis
- xIron overload conditions (hemochromatosis) — lactoferricin retains some iron-binding capacity from the parent lactoferrin molecule
Thymalin
Evidence Level
Limited human trials
FDA Status
Research compound
Safety Overview
Thymalin has an excellent safety profile based on over 40 years of clinical use in Russia. Most patients experience zero side effects, and the peptide complex has been described as 'practically non-toxic' in research literature. It has been used safely in thousands of patients, including elderly populations over extended periods.
Contraindications
- xActive thymic tumors or malignancies
- xKnown hypersensitivity to animal-derived peptide products
- xPregnancy and breastfeeding (insufficient safety data)
- xSevere uncontrolled autoimmune disease without medical supervision
Decision Guide
Which is
right for you?
Choose Lactoferricin B if...
- Research into dairy-derived antimicrobial peptides and natural innate defense mechanisms
- Investigation of structure-activity relationships in beta-sheet antimicrobial peptides
- Preclinical development of anticancer peptides targeting membrane phospholipid asymmetry
- Understanding the gastrointestinal antimicrobial defense provided by dietary lactoferrin digestion
Choose Thymalin if...
- Immune system restoration in aging adults
- Longevity and healthy aging support
- Reducing infection frequency and severity
- Multi-system health optimization