Vitamin B1 (thiamine) contributes to normal energy metabolism, the normal function of the nervous system, and normal psychological function.

The vitamin also plays an important role in the normal function of the heart. Thiamine is needed for the body to convert carbohydrates from the diet into energy and is especially important for the brain's energy supply and carbohydrate metabolism.

According to the European Food Safety Authority (EFSA), thiamine contributes to normal energy metabolism, the normal function of the nervous system, and the normal function of the heart.