Vitamin B1, also known as thiamine, is a water-soluble vitamin and part of the vitamin B complex.
This vitamin is found in various sources including grain products and pork. In general, it can be said that most foods contain little vitamin B1.
Too much of this vitamin is (as far as is known) not harmful and there are therefore no known adverse consequences of a higher intake. A shortage, on the other hand, can have negative consequences. It can lead to nervous system problems, including difficulty concentrating and memory loss.