Vitamin B1 (Thiamine)

What This Marker Means

Thiamine is essential for energy production, brain function, and nerve signaling. Severe deficiency can lead to neurological issues and profound fatigue.

How Alcohol Affects This Marker

Alcohol dramatically reduces thiamine absorption and increases depletion. Thiamine deficiency is extremely common in heavy drinkers and is a driver of alcohol-related fatigue, cognitive issues, and neuropathy.

How to Discuss With Your Doctor

Ask whether your thiamine level suggests deficiency and whether supplementation is recommended. If symptoms like brain fog, anxiety, or fatigue are present, discuss how alcohol may be contributing.