Transfer Factors.
Immune memory molecules. Transfer immunity. A colostrum fraction filtered down to its smallest peptides, taken daily to support normal immune readiness through winter and travel.
Reviewed March 2026
- Category
- Compound
- Also filed under
- Immune educationImmune memory
What Transfer Factors is, and what it does.
- Does it work
- Suits parents, teachers and frequent travellers who want a daily immune habit. Anyone avoiding dairy or egg should check which source the product uses.
- How much to take
- Start with 200 to 600mg a day, the daily maintenance band. There is no single marker compound, so follow the label of the product you have.
- Time to feel it
- Judge it over a season, not a week. Any difference shows up in how often you get run down and how fast you are back to normal.
- The first dose
- Nothing obvious on day one. It is usually taken away from meals so the peptides meet fewer digestive enzymes on the way through.
- With regular use
- Most effects take 2-8 weeks. Be patient.
- How well tolerated
- Generally well tolerated. Check with your doctor if on medications.
- How it feels
- Subtle. May improve immune response to pathogens.
- The overlooked benefit
- Egg yolk versions supply IgY, a bird antibody built differently from the mammalian kind, so a colostrum product and an egg product are not the same material.
200 to 600mg a day is where Transfer Factors works.
Source: Same as transfer factor; Pizza et al. (2006) J Interferon Cytokine Res
The proof, claim by claim.
These words describe the research, not the molecule's worth. Research strength is how much work stands behind one claim, and it is never a product score.
Based on 10 human trials.
- immune cell signallingIn vitro study
- everyday immune resilienceRandomised trial
- mucosal immune supportNarrative review
- intestinal lining supportAnimal study
Questions people ask about Transfer Factors.
- When should I take it?
- Timing matters less than consistency. Pick a time that works for you and take it daily.
- Can I take it with other supplements?
- Usually fine. The main thing to watch is not doubling up on the same ingredient from different products. If you're on prescription meds, check with your pharmacist first.
- Any side effects to watch for?
- Most people tolerate it well at recommended doses. GI upset is the most common complaint with any supplement. Start with a lower dose and work up. If something feels off, stop and reassess.
- Who benefits most from this?
- Honestly, most people would benefit more from the basics. But if you've got a specific reason to try it, the risk is generally low.
Why these belong in the same formula. Each row says what the basis is, from settled biochemistry through to a trial that measured the pair.
The transfer factor fraction is separated out of bovine colostrum, so colostrum is the feedstock rather than an independent partner. Whole colostrum brings immunoglobulins, lactoferrin, growth factors and oligosaccharides that the ultrafiltration step deliberately removes. Choosing between the two is a decision about how much of the original matrix a formula wants.
Lactoferrin sits in the same colostral whey stream and is retained on the membrane while the peptide fraction passes through. Formulators frequently put the two back together in a finished product. Lactoferrin works by binding iron and by direct interaction with microbial membranes, which is a different route from a peptide fraction.
Monocytes and T cells carry the vitamin D receptor, and calcitriol signalling alters cytokine balance and antimicrobial peptide expression in those cells. That places vitamin D status upstream of the same cell populations. This is established receptor biology, not a combination study.
Retinoic acid derived from dietary vitamin A imprints gut-homing receptors on lymphocytes and supports secretory immunoglobulin A at the mucosa. An orally taken colostral fraction is presented at that same surface. Vitamin A is fat soluble and needs dietary fat present.
Yeast beta 1,3/1,6-glucan engages dectin-1 and complement receptor 3 on innate cells, a pattern-recognition route entirely separate from a colostral peptide fraction. Formulas combine an innate input with a colostral one for that reason. No trial has tested the combination.
A low-molecular-weight peptide fraction is a natural substrate for pepsin, trypsin and chymotrypsin. Taking a protease blend in the same serving works directly against delivering that fraction intact. Separate the doses, or use a delivery form that bypasses the stomach.
Betaine hydrochloride is taken to lower stomach pH, and a lower pH speeds both acid hydrolysis and pepsin activity against peptides. Neither favours an intact peptide fraction reaching the intestine. Dose separation is the straightforward answer.
Saccharomyces boulardii acts in the lumen on tight junction integrity and on secretory immunoglobulin A output, the same compartment an oral colostral fraction reaches first. The two work by different means in one place. Grounding is mechanistic.
Bifidobacteria carry the glycoside hydrolases needed to ferment milk oligosaccharides, which is why they dominate an infant gut fed colostrum and early milk. A colostrum-derived preparation retaining oligosaccharide feeds the same organisms. How much survives the filtration and washing steps varies by process.
Glutathione peroxidases and thioredoxin reductases are selenoproteins, and they handle the oxidative load a proliferating lymphocyte produces. Where selenium intake is low that capacity is constrained. This is a background nutrient requirement rather than a specific pairing.
Neutrophils actively concentrate ascorbate well above plasma levels and use it in oxidant handling and in the apoptotic clearance that resolves an immune response. It is a nutritional requirement for the cells in question. Nothing here is a demonstrated combination effect.
Peptide fractions from colostrum are digested to their constituent amino acids, glycine among them, before those residues re-enter the body's own synthesis pools. A supporting amino acid supply is background nutrition rather than an interaction. Read it as nutritional context.
Nothing specific on file for Transfer Factors. Match the label to the daily amount above, and tell your doctor what you take.
Not medical advice. Show the label to your pharmacist.What Transfer Factors actually does.
Transfer factors is a plural name for the same low-molecular-weight colostral or leucocyte-derived fraction, conventionally below about ten kilodaltons, defined by an ultrafiltration cut-off rather than by one identified molecule.
Ultrafiltration retains immunoglobulins, lactoferrin, casein and larger whey proteins on the membrane while the peptide fraction passes into the permeate, which is what determines the composition of the finished ingredient.
Colostrum, the first mammary secretion after calving, carries far higher immunoglobulin, lactoferrin, growth factor and oligosaccharide concentrations than mature milk, and those concentrations fall within the first days, which is why the collection window is short.
Orally administered peptides meet gastric acid, pepsin and pancreatic proteases before absorption, so delivery form determines what fraction arrives structurally intact.
Where Transfer Factors comes from.
The starting material is the very first milk after a cow calves. The fat and the large proteins come out, then what is left is pushed through a filter so fine that only the smallest fragments pass. Those fragments are dried into powder. Egg yolk is used the same way in some products. Because there is no single thing to measure, strength numbers only mean something within one brand.
Made from an animal material. Species and tissue are the things worth knowing, and both belong on a label.
Colostrum is collected in the first milkings after calving, after the calf's requirement is met, and chilled or frozen at once because composition changes within hours. The avian route uses yolk from hens previously exposed to defined antigens.
Cream is separated and casein removed by precipitation or microfiltration, leaving a clear whey stream. Egg yolk material goes through lipid removal instead.
Whey passes a membrane around ten kilodaltons. The peptide fraction goes into the permeate; immunoglobulins and lactoferrin stay in the retentate. This step is what defines the ingredient.
Salts, lactose and residual small solutes are washed out and the peptide fraction is concentrated.
With no single marker molecule available, batches are specified by process, cut-off and total protein, plus microbial limits and residue testing tied to the source herd. Potency units are manufacturer-defined and do not transfer between suppliers.
The concentrate is spray dried at low inlet temperature or freeze dried to limit heat exposure, then blended and encapsulated.
Getting Transfer Factors from food.
The whole-food sources on file. A supplement closes the gap, it does not replace dinner.
A gram-for-gram figure (how much of each you would eat to match a dose) will appear here once it is sourced and reviewed. This page will not print a number it cannot cite.
The forms it comes in.
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. This information is for educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease. Consult your healthcare provider before starting any supplement regimen.