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Does Alcohol Deplete B Vitamins?
Yes. Chronic heavy drinking drains thiamin, so it is a reason to keep thiamin covered.[1]
Based on NIH Office of Dietary Supplements — Thiamin fact sheet · Updated October 10, 2026
Heavy drinking drains thiamin[1]
Chronic alcohol use appears to be the most common cause of thiamin deficiency in industrialised countries, through lower intake, poorer absorption and greater loss.
Chronic heavy drinking is a reason to keep thiamin covered.
Source [1]Thiamin: Fact Sheet for Health Professionals. NIH Office of Dietary Supplements. (ods.od.nih.gov)
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- Thiamin: Fact Sheet for Health Professionals. NIH Office of Dietary Supplements. ods.od.nih.gov
This page is general information from the cited sources, not medical advice. If you take prescription medication, are pregnant, or manage a health condition, check supplement changes with a pharmacist or doctor.