The immune system is extremely complex. It is made up of special cells, proteins, tissues and organs. It defends people against germs and microorganisms every day. In most cases, the immune system does a great job of keeping people healthy and preventing infections. But sometimes problems with the immune system can lead to illness and infection.

The immune system is able to recognize foreign microorganisms and eliminate them. A variety of immune cells must work together to accomplish this task. Taking vitamin supplements and herbs can ensure normal function of the immune system.Numerous studies suggest that selenium taken along with other minerals can help build up white blood cells, enhancing the body's ability to fight illness and infection. Zinc supplementation enhances immune system activity and protects against colds.

A number of herbs are efficacious in supporting immune function. Echinacea promotes immune cell activity and can help people recover speedily from a common cold. Ginseng is useful for general enhancement of immune function in healthy individuals. Taking coenzyme Q-10 seems to improve immune function in people with HIV/AIDS.