Vitamin B1 is vital for converting food into energy. Vitamin B-1, or thiamin, along with other B vitamins, is primarily involved in energy production in the body, especially in the brain. Its principle use is to prevent deficiency and help maintain proper mental function, especially in the elderly. Severe thiamin deficiency is relatively uncommon -except in alcoholics- where a syndrome called, Wernicke-Korsakoff syndrome (a serious brain disorder) can result from the combination of alcohol intake and a thiamin deficiency. Mild deficiency usually results in fatigue and depression. Thiamin is recommended to part of a daily regimen for Women's Health, Stress, Heart Health, Mood/Emotional Well-Being, Energy, Fitness.