Understanding IgG: What It Is & Why It Matters for Your Immune Health

What Is IgG?

Immunoglobulin G (IgG) is the most common antibody found in the bloodstream, making up about 75% of all antibodies in the body. Its job is simple but essential: it identifies viruses, bacteria, and toxins, and helps your immune system remove them.

In everyday terms, IgG acts as your body’s long-term protection system. It is the part of your immunity that “remembers” past threats and responds quickly when they return.

 

How IgG Supports Your Immune System

1. Neutralises Harmful Invaders

IgG attaches to germs and blocks them from affecting healthy cells. This is often the first step in stopping an infection before it becomes serious.

2. Signals the Immune Army

Once IgG recognises a threat, it alerts other immune cells to come in and do the cleanup work.

3. Creates Immune Memory

After your body fights off an infection, IgG stays behind as a “record” of that germ. This is why your immune system responds much faster the second time around.

4. Works in the Gut as Well

Many people think of immunity as something that happens only in the bloodstream, but a large portion of IgG activity happens in the digestive tract. Here, it binds to toxins and helps maintain a stronger gut barrier.

 

Why IgG Matters More Than You Think

Healthy IgG activity is often linked with:

• Better day-to-day immune strength
• Quicker recovery when you’re unwell
• Smoother digestion and reduced gut irritation
• More resilience during stressful or high-exposure periods

On the other hand, low or weakened IgG responses may contribute to frequent colds, slow recovery, discomfort in the gut, or feeling run-down more often than usual.

 

Where Our Colostrum Series Fits In

Colostrum is naturally rich in IgG, which is one of the reasons it has been widely used for immune and gut support. We formulate our colostrum products to preserve these natural bioactive components as much as possible.

Our colostrum range is designed to:

• Deliver naturally occurring IgG
• Support a healthier gut environment
• Reinforce your body’s daily immune defences
• Offer gentle, food-based support without relying on synthetic additives

This approach allows us to provide a product that works in harmony with the body’s own immune processes.

 

How You Can Support Your IgG Levels Naturally

1. Prioritise Restful Sleep

Good sleep helps your immune system build stronger antibody responses, including IgG.

2. Manage Daily Stress

Long-term stress can affect many parts of immunity, including the ability to produce antibodies effectively.

3. Look After Your Gut

A healthier digestive system supports better immune signalling, including IgG activity.

4. Consider Adding Colostrum

Because it’s a natural source of IgG, many people use colostrum when they want extra immune and gut support during busy, demanding periods.

 

References

1. Schroeder HW, Cavacini L. Structure and function of immunoglobulins. J Allergy Clin Immunol. 2010.
2. Vidarsson G, Dekkers G, Rispens T. IgG subclasses and allotypes: from structure to effector functions. Front Immunol. 2014.
3. Janeway CA Jr, Travers P, Walport M. Immunobiology. Garland Science.
4. Macpherson AJ, McCoy KD. The immune geography of IgA, IgG and IgE. Nat Rev Immunol. 2015.
5. Kelly CP et al. Survival of IgG antibodies in the human gut. Gastroenterology.
6. Garritsen A et al. Effects of stress on the immune system. Clin Exp Allergy.
7. Playford RJ et al. Bovine colostrum and gut barrier function. Nutrition. 2000.
8. Pakkanen R, Aalto J. Growth factors and antimicrobial factors of bovine colostrum. Int Dairy J. 1997.