Thiamin: Essential for:

releasing energy from food

healthy growth

carbohydrates and fatty acid metabolism

healthy skin, blood, hair and muscles

a healthy brain and nervous system

alcohol metabolism
Absorption and metabolism
Intake is necessary daily.
Deficiency
Deficiency of thiamin include, depression, fatigue, reduced mental functioning, cramps in muscles, nausea, enlargement of the heart and eventually beriberi, which can cause paralysis. People who abuse alcohol have a higher risk of thiamin deficiency.
Sources
These include whole grains, fish, meat and nuts.
Daily recommended dietary intakes
Men 1.2 mg
Women 1.1 mg
Pregnancy 1.4 mg
Lactation 1.5 mg