What Is 4Life Transfer Factor®? The Complete Guide

The science, the sources, and how 4Life Transfer Factor® supports your immune system every day.

Quick definition

4Life Transfer Factor® is a proprietary blend of immune-educating peptides — small bioactive molecules that help your body recognize, respond to, and remember health threats.* These peptides are concentrated through a patented extraction process from three sources: cow colostrum (UltraFactor®), chicken egg yolk (OvoFactor®), and plant-based Brassica napus seeds (PhytoFactor™). Combined, they form the foundation of 4Life's complete immune-support product line.

What are transfer factors, scientifically?

Transfer factors are low-molecular-weight peptide fractions that act as immune messengers. They were first discovered in 1949 by Dr. H. Sherwood Lawrence, an immunologist at New York University, while researching tuberculosis immunity. Dr. Lawrence demonstrated that immune information could be transferred from one person to another through these small peptide molecules — what he called "transfer factors."

The science of transfer factors evolved over the decades, leading to the founding of 4Life Research in 1998 and the launch of the first commercially available Transfer Factor® supplement.

The three sources of 4Life Transfer Factor®

UltraFactor® — from cow colostrum

Colostrum is the first milk produced after birth and is naturally rich in immune-supporting compounds. 4Life's UltraFactor® concentrates the transfer factor peptides from bovine colostrum.*

OvoFactor® — from chicken egg yolk

Egg yolk contains a different set of immune peptides than colostrum, providing complementary immune education. OvoFactor® is 4Life's egg-derived transfer factor extract.*

PhytoFactor™ — plant-based, from Brassica napus seeds

The newest source. PhytoFactor™ is a plant-based source of immune peptides extracted from the seeds of Brassica napus (the canola plant family). It's exclusive to 4Life and ideal for customers who prefer vegetarian or plant-based supplementation.*

How does 4Life Transfer Factor® support the immune system?

Transfer factor peptides act as immune messengers. Daily supplementation supports:

• Immune Recognition — Helps your body identify health threats*
• Immune Response — Supports a healthy, balanced immune reaction*
• Immune Memory — Helps your immune system remember health challenges*
• Immune Repair — Supports healthy cellular communication and repair processes*

4Life calls this the 4R approach: Recognize, Respond, Remember, Repair.

How are 4Life Transfer Factor® products made?

Every 4Life product is manufactured in 4Life's cGMP-certified U.S. facility and undergoes 20+ quality tests for identity, purity, strength, and composition. The patented extraction process ensures the peptide fractions are concentrated, stable, and consistent across every batch.

Which 4Life Transfer Factor® product is right for you?

4Life makes several formulas using these peptides:

• 4Life Transfer Factor® Plus — The flagship. Tri-Factor® peptides + Cordyvant™ botanical blend. Most comprehensive daily formula.
• 4Life Transfer Factor® Tri-Factor® — Three peptide sources without the added botanicals.
• 4Life Transfer Factor® Classic — The original UltraFactor®-only formula since 1998.
• 4Life Transfer Factor® Chewable — Tri-Factor® formula in a citrus-cream chewable.
• 4Life Transfer Factor® Max — The newest, most advanced formula. Combines UltraFactor®, OvoFactor®, and PhytoFactor™.

For a deeper comparison, see our Transfer Factor® Compared guide.

Are 4Life Transfer Factor® products safe?

4Life Transfer Factor® products are dietary supplements designed for daily long-term use. They are generally well-tolerated. As with any supplement, consult your healthcare provider before use if you are pregnant, nursing, taking prescription medications, or managing a health condition.

Where can I buy authentic 4Life Transfer Factor® products?

You can order any 4Life Transfer Factor® product directly from 4lifetransferfactorproducts.com with free U.S. shipping, no sales tax, and same-day fulfillment. Every product ships sealed and untampered, identical to ordering from 4life.com — but with our store experience and pricing.

*These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease.