Hi Jennifer,
Not just B12...
have you ever read about pyroluria... associated with B6 deficiency, zinc deficiency...AND bipolar and gluten/casein sensitivity (which frequently is the cause of IBS).
You might be interested in some of these links from The Gluten File...
Pyroluria
IBS, IBD, Crohn's
Depression, Anxiety, Panic
Also Nutritional Healing on Bipolar Disorder~
http://www.nutritional-healing.com.a...polar+Disorder
Cara