Vitamin B1 / Thiamine
Also known as: Thiamine, Thiamine Hydrochloride, Thiamine Mononitrate, Vitamin B1
Vitamin B1, also known as thiamine, is a water-soluble vitamin essential for converting carbohydrates into energy. It plays a critical role in nerve function and muscle contractions. Thiamine functions as a coenzyme in multiple metabolic pathways and is essential for proper brain and nervous system function.
Benefits
Essential for energy metabolism and converting food into usable fuel. Supports nervous system function and nerve health. Important for muscle function and proper heart contraction. Supports brain health and cognitive function. May help reduce stress and anxiety symptoms. Important for immune function and antibody production.
Recommended Dosage
RDA: 1.2 mg/day for men, 1.1 mg/day for women. Common supplement doses: 25–100 mg daily. Upper limit: No established upper limit (water-soluble, excess is excreted). May be better absorbed when taken with food. B-complex vitamins work synergistically, so combining with other B vitamins is beneficial.
Food Sources
Whole grains, pork, beef, liver, sunflower seeds, pumpkin seeds, legumes (lentils, chickpeas, black beans), asparagus, mushrooms, spinach, fish, eggs, wheat germ, brown rice.
Side Effects
Water-soluble vitamin with very low toxicity. Rare side effects from supplementation: nausea, stomach pain, or allergic reactions (extremely rare). Parenteral administration in sensitive individuals may cause anaphylaxis. Excessive sweating and itching reported at very high doses.
Interactions
Loop diuretics increase thiamine requirements and urinary excretion. Phenytoin may impair thiamine metabolism. Cisplatin and other chemotherapy drugs increase losses. Alcohol impairs thiamine absorption and storage.
Warnings
Alcoholics and those with liver disease are at high risk for deficiency. People undergoing dialysis should supplement. Pregnant and breastfeeding women need adequate intake. Those with hyperemesis gravidarum require supplementation.
Deficiency Symptoms
Early signs: fatigue, irritability, poor concentration, anorexia. Beriberi (severe deficiency): weakness, nerve pain (peripheral neuropathy), muscle wasting, poor coordination, cardiovascular dysfunction, confusion. Wernicke-Korsakoff syndrome in severe cases.
Frequently Asked Questions
What are the benefits of Vitamin B1 / Thiamine?▼
Essential for energy metabolism and converting food into usable fuel. Supports nervous system function and nerve health. Important for muscle function and proper heart contraction. Supports brain health and cognitive function. May help reduce stress and anxiety symptoms. Important for immune function and antibody production.
What is the recommended dosage for Vitamin B1 / Thiamine?▼
RDA: 1.2 mg/day for men, 1.1 mg/day for women. Common supplement doses: 25–100 mg daily. Upper limit: No established upper limit (water-soluble, excess is excreted). May be better absorbed when taken with food. B-complex vitamins work synergistically, so combining with other B vitamins is beneficial.
What foods contain Vitamin B1 / Thiamine?▼
Whole grains, pork, beef, liver, sunflower seeds, pumpkin seeds, legumes (lentils, chickpeas, black beans), asparagus, mushrooms, spinach, fish, eggs, wheat germ, brown rice.
What are the side effects of Vitamin B1 / Thiamine?▼
Water-soluble vitamin with very low toxicity. Rare side effects from supplementation: nausea, stomach pain, or allergic reactions (extremely rare). Parenteral administration in sensitive individuals may cause anaphylaxis. Excessive sweating and itching reported at very high doses.
What are the symptoms of Vitamin B1 / Thiamine deficiency?▼
Early signs: fatigue, irritability, poor concentration, anorexia. Beriberi (severe deficiency): weakness, nerve pain (peripheral neuropathy), muscle wasting, poor coordination, cardiovascular dysfunction, confusion. Wernicke-Korsakoff syndrome in severe cases.
Related Supplements
Vitamin D
Vitamins
Vitamin D is a fat-soluble vitamin that plays a crucial role in calcium absorption, bone health, immune function, and mood regulation. Unlike most vitamins, your body can produce vitamin D when your skin is exposed to sunlight, earning it the nickname 'the sunshine vitamin.'
Vitamin C
Vitamins
Vitamin C is a water-soluble vitamin and powerful antioxidant that the human body cannot produce on its own. It is essential for the growth, development, and repair of all body tissues and plays a role in many body functions including immune defense, collagen formation, and iron absorption.
Omega-3 Fish Oil
Fatty Acids
Omega-3 fatty acids are essential polyunsaturated fats that your body cannot make on its own. The two most important omega-3s found in fish oil are EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid). They play critical roles in brain function, heart health, and reducing inflammation throughout the body.
Supplement Disclaimer
This supplement information is for educational purposes only and should not replace professional medical advice. Dietary supplements are not intended to diagnose, treat, cure, or prevent any disease. Always consult with a healthcare provider before starting any supplement, especially if you are pregnant, nursing, taking medications, or have a medical condition.