Vitamin B1
Vitamin B1, or thiamine, is an essential water-soluble vitamin found in whole grains, legumes and pork, and is needed to turn food into energy.
Also listed as Thiamine, B1, B-1
What it is studied for
The strongest rated effects first. Bars show the size of the effect, the letter grades the evidence, and each rating lists the studies behind it.
What does vitamin B1 do?
Thiamin helps release energy from carbohydrates and proteins and supports nerve signaling. Severe deficiency can damage nerves and cause muscle and heart weakness. 1
Why people take it
SuppCo community snapshot, 2026-09-28. Reasons for use are not evidence that it works.
Questions people ask
Does the body store much B1?
No. Storage is limited, so regular dietary intake matters. 2
Can cooking reduce B1?
Yes. Heat, air and water can reduce thiamin in food. 2
Are trial doses a daily requirement?
No. The fatigue trial studied 600–1,800 mg daily as an experimental intervention in a selected patient group. 3
Vitamin B3
Vitamin B12
Vitamin B Complex
Vitamin B6
Benfotiamine