Blister4, search on "anxiety thiamine" and "IBS thiamine". Also see how it may benefit dementia. Thiamine needs magnesium to become bioactive. Research anti thiamine factors that diminish thiamine. Always consult with your health care professional before using any supplement.
Blister4, yes amitriptyline is an inhibitor of thiamine transport in addition to others in this first link. The other link is a comprehensive list from the stuttering blog of other thiamine diminishers.
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