Thiamine

Thiamine (or thiamin) is vitamin B1. It is a water-soluble vitamin of the B complex. Its phosphate derivatives take part in many cellular processes. Thiamine pyrophosphate (TPP) is a coenzyme in the catabolism of sugars and amino acids. 
also it can be found in Food and Manufactured Dietary supplements also in Medications Foods that provide Thiamine include whole grains, Legume 
Lack of thiamine causes beriberi.