Stress, allergies, poor diet, excessive caffeine, sugar, alcohol, air pollution, toxic overload, emotional wear & tear, insomnia, digestive problems and colon dysfuntion all adversely affect our immune system.  The first step is to correct these things, by changing them where we can, and learning management or support techniques where we can't.   Nutrients that are commonly deficient are the B vitamins (especially B12) , C, D and E, zinc and selenium.  An excellent immune system specific multi vitamin that is Thymate.  Consider Whey Protein for its Glutathione enhancing qualities. 

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