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Chicken soup really does help with colds. It helps un-stuff your nasal passages and prevents congestion in the lungs according to two well-respected university studies.
Dandruff is cured by using apple cider vinegar, diluted with water in a ratio of 1/2 vinegar, 1/2 water, as a rinse after shampooing. For severe cases, soak your hair in apple cider vinegar for one hour before shampooing.
There's lots more information at the sources listed below.
Sources: health911.com, UAB Health System, tenlinks.com.