But it doesn't stop there.

What if the skin doesn't stop the invader? Well, once inside the body there is a whole system designed to fight off the assault. This system consists of antibodies, bone marrow, complement system, hormones, lymph system, spleen, thymus, and white blood cells. It's the job of this whole system working together to either keep out the foreign invaders or go on a search and destroy mission once they get past the barrier and into our system.

The immune system is amazingly complex, able to recognize foreign cells, tag them for elimination while not tagging our own cells for the same destruction.

When the immune system targets the wrong cells--such as our own--it can cause a whole host of disorders. These self-induced autoimmune diseases, like allergic reactions, arthritis, even forms of diabetes can be devastating to our health.

Free radicals from external sources--the environment, viral infections, auto-immune disorders, or even trauma can also wreck havoc with us. Free radicals contribute to cell damage and maybe even play a role in things going haywire.

Some day the research being done now to understand the system of complex checks and balances may advance far enough to treat these auto-immune disorders better. In the future it may be possible to suppress parts of the immune system that are overactive. This would help treat all sorts of diseases from arthritis, to eczema to lupus.

So it's important to do all we can to keep our immune system healthy as possible.

Infections are the most common cause of diseases in our bodies. They can range from a common cold to life threatening diseases, such as AIDS.

Most bacteria are different from the diseases caused by viruses. Bacteria don't invade the cells themselves, and are more easily attacked and killed by the immune system.

Viruses are different. They must actually enter the cell to survive, so a different kind of immune defense. The whole cell gets tagged for destruction by our immune system for destruction. Some parasites (like malaria) by invade the cell as well, triggering the histochemical response needed to destroy the invader.

We know that the World Health Organization in 2009 declared the globe to be in Stage 6 of a world pandemic of the H1N1 flu virus. The spread of this virus will increase as the year progresses. This is a warning to keep ourselves on alert, and keep our immune system in the best condition we can.

One key to keeping our immune system healthy is to make sure we provide our body with all the necessary building blocks it needs for this task.

To help support the immune system through supplementation, Immunizen contains cutting-edge ingredients that provide a food source in the intestinal tract for "friendly" bacteria crucial to immune function and support the body's immune cells--especially macrophages--in digesting foreign material in the bloodstream. This supplement's patented form of Intact® colostrum and other ingredients supply key immunoglobulins, antibodies, inhibitors, protein compounds, growth factors, and enzymes.

Give the body an additional boost by combining it with Nature Force, a potent combination that is designed to provide you with even more antioxidants for cell protection.

Then add the natural homeopathic supplement Defend-Ol designed to guard against environmental pollutants that bombard our system every day.

If your this deep in the article you are interested in the immune system. Below are some suggestions for Immune Pack combinations that are designed to give your body maximum immune support.