You're in. What you've just read about is real, named, patented, and clinically proven. Below is a quick introduction to the 4Life Transfer Factor product line, the seventy-year journey of the science, the three hero immune systems behind it, and the offer reserved for early invitees.
Transfer Factor is a class of small immune peptides — molecular messengers that help your immune system recognize, respond to, and remember potential threats. First identified at NYU in 1949, Transfer Factor is now produced by 4Life Research from bovine colostrum, hyperimmune egg yolk, and (most recently) the seeds of the Brassica napus plant — the first vegan source of Transfer Factor in the molecule's seventy-five-year history. Borrowed Immunity is our way of explaining what these peptides do in plain English. (New here? Read our complete Transfer Factor guide first.)
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with PhytoFactor™ and IP-6 — clinical-strength immune support, launching July.
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Jacki Smith is a Certified Health Coach, network marketing professional, and entrepreneur with thirty years in health and wellness — twenty-five of them full-time. Mentored from a young age by two of the most respected networkers in the industry, she has built organizations of more than 25,000 people across West Africa, where she keeps a second home in Ghana. After her own fifty-pound weight-loss transformation, Jacki dedicated herself to helping others build lasting wellness through products and practices she actually uses. She created Borrowed Immunity to translate seventy years of Transfer Factor research into something everyday people can understand and act on — and to help anyone who's interested discover the kind of time freedom this business can build. Watch the video below for a quick introduction to the 4Life Transfer Factor product line.
Borrowed Immunity isn't just a product brand — it's also a business opportunity that has built organizations across more than sixty countries. If you're curious about how 4Life Pays its distributors, how the comp plan works, and what kind of income is realistic at each level, take ten minutes with the official walkthrough.
The story of Transfer Factor is the story of borrowed wisdom — a relay race carried first by physicians, then by the cow, then the chicken, and now, against every prediction, by the plant. Each new source has expanded the immune library. Each generation has strengthened the inheritance.
Dr. H. Sherwood Lawrence, working at New York University, demonstrates that a small molecular extract from one person's immune cells can transfer specific immunity to another person who had never encountered the threat. He named it Transfer Factor. The medical world took note — and then, distracted by antibiotics and vaccines, looked away.
First Identified · NYU School of MedicineResearchers patent a method for extracting Transfer Factor from bovine first-milk colostrum. The cow is a hero immune system in motion — pastures alive with bacteria, open water, a maternal immunity so robust her colostrum must protect a newborn calf against every pathogen in her environment. Borrowed immunity, finally scalable.
Source · Bovine First-Milk ColostrumDavid and Bianca Lisonbee found 4Life Research with a single mission — to bring Transfer Factor to households worldwide and build the science of immune education out from the laboratory. Within a year they launch the first commercial Transfer Factor product. The era of borrowed immunity finally meets the people it was always meant for.
4Life Research · Salt Lake City, Utah4Life patents the Tri-Factor Formula, combining bovine colostrum-derived Transfer Factor with avian Transfer Factor extracted from hyperimmune egg yolks. The hen lives in environments most mammals couldn't survive — every yolk must protect a developing chick through twenty-one days of every conceivable threat. Two heroes. Two threat libraries. One recipient. NK cell activity climbs to a recorded 437% over baseline.
Tri-Factor Formula · Bovine + AvianFor seventy years, Transfer Factor was assumed to be exclusively mammalian. Then 4Life's research team turned to the seeds of Brassica napus, a plant that has spent millions of years engineering chemical defenses no mammal could survive without. Plants cannot run from threats; they have evolved a sophistication of molecular signaling that animals can only borrow.
The result is PhytoFactor™ — 4Life's first vegan source of Transfer Factor in 28 years. In preclinical research, PhytoFactor has a direct effect on invading organisms AND activates the immune cells' response. In 4Life Transfer Factor® Max, 300 mg of PhytoFactor combines with 600 mg of animal-based Tri-Factor Formula — all four types of 4Life Transfer Factor in a single product, supported by three clinical studies.
PhytoFactor™ · From Brassica napus SeedsA new chapter in borrowed immunity. The first of its kind in seventy years.
4Life Transfer Factor® Max is the first formula to combine all three sources — peptides from Plant, Colostrum, and Egg — in a single capsule. Three immune libraries, three sets of lessons, one borrowed inheritance.
Pastures alive with bacteria. Open water. Walking in a microbial inheritance no human has matched in a century. Her first-milking colostrum is the densest concentrated immune education on the planet — and it is the foundation of every Transfer Factor product 4Life has ever made.
Hens live where most mammals couldn't survive — packed environments, airborne pathogens, fungi everywhere. The egg yolk must protect a developing chick for twenty-one days through every conceivable threat. The result is a second immune library, written in an entirely different alphabet — and it compounds, never replaces, what the cow already taught.
Plants cannot run from threats — they evolve. Brassica napus has spent millions of years engineering chemical defenses no mammal could survive without. PhytoFactor™ is 4Life's groundbreaking extract from Brassica napus seeds — proteins and peptides that have a direct effect on invading organisms and activate the immune cells' response. The first vegan source of Transfer Factor in 4Life's 28-year history. Hypoallergenic. Universal.
4Life Transfer Factor® Max isn't a marketing claim — it's a measurement. Independent clinical work has documented effects that the supplement industry simply doesn't see at this scale.
The increase in natural killer cell function — the gold-standard biomarker of innate immunity — documented in independent clinical trials of healthy subjects.
The breadth of immune cell types modulated: NK cells, B cells, T cells, neutrophils, macrophages, and immune stem cells — virtually every front line.
The measured response window from dose to systemic immune activation — fast enough to matter when seasons turn or stress hits.
600 mg of Tri-Factor Formula from animal sources plus 300 mg of plant-based PhytoFactor — clinically shown to mobilize millions of immune stem cells for repair.
Transfer Factor doesn't drug the immune system — it teaches it. Here's what people typically experience, verified in clinical settings and reported across two decades of 4Life consumer feedback.
Innate immunity primed to recognize and respond before symptoms can take hold — backed by the documented 437% NK cell increase.
When the immune system isn't running constant low-grade interference, the body releases the metabolic resources fatigue had been borrowing.
Modulation, not stimulation. Over-reactive systems quiet down. Under-reactive systems wake up. The body finds its center.
Quicker bounce-back from late nights, travel, stress, and seasonal exposure. Activation in two hours; effect over the long arc.
Documented increases in immune stem cell populations — the foundation upon which every other immune cell type is built.
Unlike drugs, Transfer Factor builds. Each dose extends the immune library. The longer you take it, the more your body knows.
"I've taken every immune supplement on the market for fifteen years. Within three weeks of Transfer Factor Max, my doctor asked what changed. Bloodwork doesn't lie."Dr. M. ReyesFunctional Medicine, Austin
"I'm a registered nurse. My family went through one cold season untouched while everyone around us was wiped out. I don't believe in luck. I believe in this."Sandra W.RN, Cleveland Clinic alum
"At 64 I thought my baseline was just what it was. Six months in and I'm sleeping deeper, recovering faster, and my chronic sinus issue — gone. I keep waiting for the catch."James K.Retired engineer, Phoenix
Three doorways into the same seventy-year science. Two ready today, one launching in July.
The flagship formula. A proprietary combination of UltraFactor® and NanoFactor® from cow colostrum and OvoFactor® from chicken egg yolks — patented in 2004 and clinically proven to activate the immune system within two hours.
Tri-Factor Formula layered with a proprietary Super Mushroom Blend — shiitake, maitake, agaricus, and cordyceps — plus zinc. The deepest immune fortification short of Max, and the formula most members swear by.
4Life's most powerful immune support — the only product with all four types of Transfer Factor. 900 mg of peptides from Plant, Colostrum, and Egg, plus IP-6 and a Super Mushroom Blend. Three clinical studies. Launching July 1, 2026.
Take your first bottle for thirty days. Sleep on it, train on it, weather a season on it. If you can't honestly say something is starting to shift — your energy, your recovery, your baseline — send the bottle back and we'll refund every cent. The risk lives entirely with us.
Four quick questions. We'll point you to the formula that actually matches your situation — no upsell, no fluff.
Based on your answers, this is the formula that best fits where you are right now.
Choose Tri-Factor or Plus today, or reserve your place at the front of the line for Max. Seventy years of science behind a single decision — or take it one step further and explore the income opportunity behind it.