Many people have been interested in my blog on celiac disease and depression. I have found an article on Celiac.com which may be of interest to you. It is regarding a study showing that pyridoxine (vitamin B-6) may help symptoms of depression which are due to adult celiac disease:
The results indicate a causal relationship between adult coeliac disease and concomitant depressive symptoms which seems to implicate metabolic effects from pyridoxine deficiency influencing central mechanisms regulating mood.
Please view the entire article for details at the Celiac.com link above. The article was written by Scott Adams.