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What is Vitamin B1?

Jan. 24, 2026

Analysis of bowel habits in over 268,000 people reveals how thiamine-related genes influence gut motility, linking constipation and diarrhea to shared biology and suggesting new IBS treatments.

About Vitamin B1:

  • Also known as thiamine or thiamin, vitamin B1 is a water-soluble vitamin, as are all vitamins of the B complex.
  • Benefits:
    • Thiamine helps convert carbohydrates into energy, allowing our cells to function optimally.
    • It is also involved in supporting the nervous system, promoting healthy brain function, and aiding in the metabolism of proteins and fats.
    • Vitamin B1 helps prevent complications in the:
      • nervous system
      • brain
      • muscles
      • heart
      • stomach
      • intestines
    • It is also involved in the flow of electrolytes into and out of muscle and nerve cells.
  • Thiamine occurs naturally in specific diets, is added to food products, and is available in dietary supplements.
  • Brown rice, whole grains, pork, poultry, soybeans, nuts, peas, dried beans, and fortified or enriched grain products such as bread, cereals, and infant formulas are rich sources of thiamine.
  • Humans need a continuous supply of vitamin B1 because the body does not store it in significant amounts.
  • Vitamin B1 Deficiency:
    • A deficiency in thiamine can lead to a condition known as beriberi, which can cause symptoms like weakness, fatigue, nerve problems, and heart issues.

Wernicke-Korsakoff syndrome: This severe form of thiamine deficiency is often associated with alcohol abuse and can lead to symptoms such as: 

  • Confusion and memory loss.
  • Difficulty with balance and coordination.
  • Visual disturbances, including double vision or eye muscle weakness.

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