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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.

Supplements can interact with medications and aren't right for everyone, especially during pregnancy or breastfeeding, or with a chronic condition. Ask your provider before you start.

Studied 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
What variations of thiamine exist?Our top pick, what to skip, and how to read the label

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

5 products in Dr. Lesher's dispensary list thiamine (b1) on the label.

Check with your provider before taking any of these, especially if you're pregnant or take medications.

Parts of the body it affects

Explore what each area does and the conditions that can affect it.

Illustration of the human brain

Brain & nerves

Your brain, spinal cord, and nerves carry every signal in your body, from movement and sensation to mood and memory.

Illustrations: Servier Medical Art, CC BY 4.0

Dr. Lesher, ND

Ready to find the root cause?

Dr. Lesher is a Naturopathic Doctor who focuses on autoimmune and chronic conditions in women. Since 2020, she's helped hundreds of patients stop managing symptoms and start healing.

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