With immune health at the forefront of everyone's minds, nutrition plays a key role. Learn about the vitamins and minerals that play a key role in supporting immune health as well as the deficiencies that can lead to a weakened immune system and greater susceptibility to infection.  Ben Brown is a science writer and speaker. He teaches nutritional medicine, speaks internationally, and contributes regularly to magazines and scientific journals. Ben also works in the research and development of herbs and natural supplements. He is author of The Digestive Health Solution.