I have known B1 (thiamine) to be such an important vitamin. It is so involved with your health.
But then I found an educational video by Dr. Eric Berg, D.C. about what a deficiency of B1 will do. It is very informative.
I think with so many people depleting B1 by using caffeine, sugar, medical drugs, processed foods etc. etc. that this is important to know. I can affect the conditions such as lack of tears, restless leg syndrome, sleep apnea, and even memory problems. But, etc. etc. etc.