Our world today is filled with challenges that can weaken immune function and reduce the body’s ability to protect you. Poor nutrition. Lack of sleep. Stress.

Life is filled with health threats—many are invisible. Viruses such as influenza and hepatitis. Increasingly resistant bacteria. Environmental toxins. Pathogens from other lands, such as SARS and avian flu. You are exposed every day. But you’re not defenseless. Watch the video above to find out more.