(Sponsored Ads) Dr. Cassel says many of the issues people take to boost their immune system, such as nutritional vitamins or supplements, don't have any effect in your immune response. Vitamin B6 is significant to supporting biochemical reactions within the immune system. Vitamin B6-wealthy foods embrace chicken and chilly-water fish such as salmon and tuna. Vitamin B6 is also found in green greens and in chickpeas, which is the main ingredient in hummus.