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Thiamine (B1)
Also called: Vitamin B1, thiamin, benfotiamine
Helps turn food, especially carbohydrates, into energy and keeps nerves and the heart working normally. Deficiency is more likely with heavy alcohol use, weight-loss surgery, or long-term vomiting.
Commonly used for
- Energy metabolism
- Nerve health
- Nerve symptoms related to high blood sugar (benfotiamine, some studies)
- Deficiency risk after weight-loss surgery
Found naturally in
- Pork
- Beans and lentils
- Sunflower seeds
- Whole grains
- Fortified cereals
Label red flags
- Neuropathy products that make treatment claims
- Several forms listed in one product, which makes the total B1 hard to tell
Check with a provider
- Heavy alcohol use, weight-loss surgery, or severe vomiting in pregnancy. These can cause a serious deficiency that needs medical care, not just a supplement.
- Taking loop diuretics such as furosemide long term, which can lower thiamine
- Pregnant or breastfeeding. The amount in a prenatal is fine. Ask before adding more.
Supplements that contain it
Brand nameProduct nameB-complex formulasComing soon
Brand nameProduct nameMultivitaminsComing soon
Brand nameProduct namePrenatalsComing soon
Brand nameProduct nameNerve support formulasComing soon
Brand nameProduct nameB-complex formulasComing soon
Brand nameProduct nameMultivitaminsComing soon
Parts of the body it affects
Explore what each area does and the conditions that can affect it.
Illustrations: Servier Medical Art, CC BY 4.0
Wondering if your symptoms fit a pattern?
Dr. Lesher is a naturopathic doctor who specializes in women's autoimmune and chronic conditions. Since 2020, she has helped more than 900 patients overcome and heal from their conditions.