Your Immune System Is Vital!

Everyone benefits from a strong, balanced immune system. Exercise, sleep, healthy food, and stress management all help — but even then, your immune system doesn't always work at its best.

When your immune system has to work harder than it should, you often feel it as fatigue: less energy for everyday life and slow recovery.
Situation in which the immune system may benefit from additional support may include advancing age, recovery from illness or surgery, during periods of increased physical or mental demand or stress, inadequate sleep, or other circumstances that place increased demands on the body's natural defences.

Maintaining a well-balanced immune response is essential. An immune system that reacts too strongly can contribute to allergic conditions such as hay fever and eczema and, in some cases, may play a role in autoimmune diseases such as rheumatoid arthritis or Crohn's disease. Conversely, an immune system that does not respond effectively may leave the body more susceptible to infections, resulting in illnesses that occur more frequently, last longer, or are more severe.

Supporting your immune system is therefore not simply about making it "stronger", but about helping it function in a balanced, coordinated, and effective way. A well-functioning immune system is better equipped to recognize potential threats, respond appropriately, remember them, and return to a healthy state once the challenge has passed.

The Discovery of “Immune Trainers”

The story of “Immune Trainer molecules” began in 1949, when American immunologist Dr. Sherwood Lawrence discovered that certain immune messenger molecules could transfer specific immune responsiveness from one individual to another. He named these molecules Transfer Factors, marking the beginning of an entirely new field of immune system research.

Later Transfer Factors were discovered in an abundant natural source: colostrum.
Every person is born with an immature, inexperienced immune system.
The first milk a newborn receives—colostrum—contains natural Transfer Factor peptides, along with many other immune-supporting components. These Transfer Factor peptides help to transfer immune information from the mother to the newborn, assisting the newborn's developing immune system in recognizing and responding to potential threats.
Transfer factors have been identified in both human and bovine (cow) colostrum, and research has shown they are not species-specific.

Two videos explain how Transfer Factors work:

Transfer Factors Health Supplements

Since 1998, the American company 4Life Research has developed patented methods to extract and concentrate Transfer Factors from bovine colostrum into its nutritional supplements.
Building on decades of scientific innovation, 4Life Research added Transfer Factors extracted from egg yolk to their product offering. Recently, after years of research into plant bioactives, 4Life added PhytoFactor—a proprietary plant-derived molecule extracted from Brassica napus. PhytoFactor complements the company's Transfer Factor technology with an additional, plant-based approach to supporting healthy immune system function.
4Life Research’s supplements are designed to support the immune system's ability to recognize, respond to, and remember potential threats as part of a healthy lifestyle. They are intended for adults of all ages.

Note: Transfer Factors are not medicines. These products are not intended to diagnose, treat, cure, or prevent any disease. If you have a health condition, please consult your doctor or healthcare provider.

A Healthy Immune System To Live Life to the Fullest

Your immune system is your body's natural defence network. It is an essential part of your overall wellness. Like your muscles, it benefits from daily nutrition and healthy habits. Caring for it every day helps keep it ready for everyday health challenges, so you can stay active and feel your best.

Your immune system doesn't stay static — it changes with stress, sleep, habits like smoking, pollution, nutrition, activity level, and age itself.

As we age, everyone experiences a natural process called immunosenescence—the gradual aging of the immune system. This is a normal part of growing older, but it can make it harder for the body to recognize and fight infections, slow recovery, and reduce vaccine effectiveness. While this is a normal part of aging, healthy habits can help support immune function and healthy aging.

Your Immune System May Reveal Your Biological Age

Research on aging increasingly looks at "biological age" — how old your body's systems function, versus how many birthdays you've had.

Stanford Medicine's iAge study that included 1000 persons over 7 years (Sayed et al., Nature Medicine, 2021) showed that
immune health may be a better indicator of healthy aging than chronological age, emphasizing the importance of a well-functioning immune system (it is not a study of any specific supplement or of 4Life products).

Not Vitamins. Not Minerals. A Different Role.

Vitamins and minerals provide the nutrients your immune system needs. Transfer Factors don't replace those nutrients—they work differently.
Transfer Factors help support your immune system's natural ability to recognize, respond to, and remember potential threats, thus promoting a balanced and coordinated immune response.

Think of an orchestra. Vitamins and minerals are the musicians—each plays an essential role. Transfer Factors are like the conductor: they don't play an instrument themselves, but they help coordinate the orchestra by setting the tempo, guiding the timing, balancing the loudness of each section, cueing the right instruments at the right moment, and keeping everyone working in harmony for the best performance.

Research Behind 4Life Immune Trainers

4Life Research has published and sponsored a number of peer-reviewed studies on its Transfer Factor products, including:

• A 2025 study in the International Journal of Molecular Sciences (Boichuk, Galembikova & Vollmer, Kazan State Medical University) showing that 4Life Transfer Factor AgePro® increased natural killer (NK) cell activity in a 30-day human trial across a wide age range.

• A 2024 placebo-controlled, cross-over study in Current Issues in Molecular Biology, conducted independently by NIS Labs, measuring changes in immune biomarkers (e.g., NK cell activation, cytokines) within hours of taking 4Life Transfer Factor Tri-Factor® Formula.
  

Additional studies are listed on 4Life's own research page: https://www.4life.com/corp/page/47/studies-and-publications, and many peer-reviewed Transfer Factor studies are searchable on PubMed: https://pubmed.ncbi.nlm.nih.gov/

In Their Own Words

For over 25 years many people around the world enjoyed Transfer Factor products and felt their benefit. Some testimonials (in English and Dutch):

Tip

If you'd like to understand which “Immune Trainers” fit your situation, reach out to the person who introduced you to Transfer Factors.
This person can help you get discounted access to your own supply.
Prevention is better than cure!