Function: Energy metabolism (carbohydrate metabolism), neurological activity, brain and heart function
Sources: Pork, beef, liver, brewer's yeast, whole grains, brown rice, legumes
Optimal Intake: 5 to 10 mg
Deficiency Signs: Beriberi, a condition characterized by fatigue, anorexia, weight loss, gastrointestinal disorders, fluid retention, weakness, heart abnormalities, stunted growth, cyanosis, convulsions, poor memory
Toxicity: None reported