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What is Vitamin B1 do?

Author

James Craig

Published Jan 22, 2026

Vitamin B1, also called thiamine or thiamin, is one of 8 B vitamins. All B vitamins help the body convert food (carbohydrates) into fuel (glucose), which the body uses to produce energy. These B vitamins, often referred to as B-complex vitamins, also help the body metabolize fats and protein.

What are the benefits of taking vitamin B1?

Vitamin B1, or thiamin, helps prevent complications in the nervous system, brain, muscles, heart, stomach, and intestines. It is also involved in the flow of electrolytes into and out of muscle and nerve cells.

What are the symptoms of low vitamin B1?

Symptoms of thiamine (B1) deficiency

  1. Loss of appetite. Experiencing an atypical loss of appetite can be one of the earliest symptoms of thiamine deficiency. ...
  2. Fatigue. ...
  3. Irritability. ...
  4. Nerve damage. ...
  5. Tingling arms and legs. ...
  6. Blurry vision. ...
  7. Nausea and vomiting. ...
  8. Delirium.

Can I take vitamin B1 everyday?

RDA: The Recommended Dietary Allowance (RDA) for men ages 19 and older is 1.2 mg daily, and for women in the same age range 1.1 mg daily. For pregnancy and lactation, the amount increases to 1.4 mg daily.

When should I take vitamin B1?

Thiamine tablets are usually taken once a day. Doses of 25-100 mg are sufficient to prevent mild deficiency. You can take the tablets at whatever time of day you find easiest to remember, either before or after meals.

38 related questions found

Should I take B1 in the morning or at night?

The best time to take B vitamins is after you wake up. Some data suggest that taking vitamin B in the afternoon can affect your sleep. To avoid a B-complex affecting your sleep, you should take your B vitamins in the morning, preferably with a meal to maximize their absorption.

Does vitamin B1 help you sleep?

Vitamin B1 and B2 for sleep

Both vitamin B1 and B2 are essential for our bodies in order to convert food into energy—and for the production of the sleep hormone, melatonin. Commonly, deficiencies for both are not tested as current medical advice suggests they can be sourced from diet alone.

Who needs thiamine?

People take thiamine for conditions related to low levels of thiamine, including beriberi and inflammation of the nerves (neuritis). It's also used for digestive problems, diabetic nerve pain, heart disease, and other conditions, but there is no good scientific evidence to support these other uses.

Does vitamin B1 raise blood pressure?

When the amount of vitamin B1, also known as thiamine exceeds the normal levels in the body, it can cause hypertension or high blood pressure.

Does thiamine cause weight gain?

For treatment, subjects were randomly assigned to either thiamin (10 mg daily) or placebo groups. Compared to baseline and placebo supplemented values, thiamin-supplemented women experienced significantly increased appetite, energy intake, body weight and general well-being, and decreased fatigue.

Which disease is caused by lack of vitamin B1?

Beriberi is a disease in which the body does not have enough thiamine (vitamin B1).

Which fruit has highest amount of thiamine?

Some of the highest thiamin fruits include raisins, jackfruit, orange, pineapple, avocado, grapes, figs, grapefruit, cantaloupe and currants.

Which vitamin B1 is best?

Top Vitamin B1 (Thiamine) Supplements

  • Solgar Vitamin B1 500 mg.
  • Benfotiamine 300mg | 90 Capsules.
  • Benfotiamine 300mg 180 Veggie Caps.
  • EZ Melts B1 as Thiamine.
  • Life Extension Benfotiamine with Thiamine.
  • Mason Natural, Vitamin B-1 Thiamine Tablets.
  • Benfotiamine 300mg Manufactured in The USA.

Is vitamin B12 the same as vitamin B1?

The main difference between vitamin B1 and B12 is that vitamin B1 is required for the nourishment and growth of the cells in the body. While vitamin B12 is a very necessary component in the metabolism process and also in the nervous system functioning. Both vitamins B1 and B12 belong to the B group of vitamins.

What are the side effects of thiamine?

Thiamine may cause side effects. Tell your doctor if either of these symptoms is severe or does not go away:

  • flushing.
  • hives.
  • itching.
  • weakness.
  • sweating.
  • nausea.
  • restlessness.

What are the side effects of too much vitamin B1?

Side effects of thiamine include:

  • warmth.
  • severe allergic reaction (anaphylaxis)
  • skin discoloration.
  • sweating.
  • restlessness.
  • rapid swelling of the skin.
  • itching.
  • hives.

Is vitamin B1 good for memory?

New Data Suggests Raising Vitamin B1 Levels very high Helps People Living with mild Alzheimer's Disease | Burke Neurological Institute | Weill Cornell Medicine.

Is vitamin B1 good for kidneys?

Research shows that high doses of vitamin B1 (thiamine) could reduce kidney disease in people with Type 2 diabetes. In 2007, Diabetes UK-funded research at the University of Warwick showed that people with Type 1 and Type 2 diabetes have around 75 per cent less levels of vitamin B1 than people without diabetes.

Is thiamine good for anxiety?

For anxiety, thiamine has been used successfully at doses of 250 mg/day to treat patients with anxiety disorders, including symptoms manifesting as chronic fatigue, insomnia, nightmares, anorexia, nausea and vomiting, diarrhea or constipation, chest and abdominal pain, depression, aggression, headache, diaphoresis, and ...

Is thiamine good for the liver?

This discovery of the potent anti-steatotic effect of thiamine may prove clinically useful in managing fatty liver-related disorders.

What is the best vitamin for tiredness?

Vitamin B is recommended as one of the top vitamins to help with tiredness, so you can also opt for a supplement if you're struggling to stay topped up through your diet. Vitamins should be used alongside a balanced diet.

Which vitamins keep you awake at night?

Most people don't realize that vitamin supplements can cause sleepless nights. Since vitamins are essential nutrients your body needs to function, it sounds counterintuitive. However, vitamins A, B5, B6, B12, C, D, and K can keep you awake at night.

What vitamins should not be taken at night?

There are several reasons why you should not take certain supplements at night. For example, a supplement could contain sugar or caffeine, which could cause sleep problems.
...

  • Vitamins B. ...
  • Multivitamins and energy herbs. ...
  • Vitamin D. ...
  • Calcium. ...
  • Vitamin C. ...
  • Zinc.

Is magnesium good for sleeping?

Magnesium helps the body relax. This nutrient reduces stress and helps you sleep longer. In contrast, melatonin helps you get to sleep faster. Both magnesium and melatonin can be used to treat insomnia, sometimes even in combination.

Should I take all my vitamins at once?

You can—but it's probably not a good idea. For some supplements, optimal absorption can depend on the time of day taken. Not only that—taking certain vitamins, minerals, or other supplements together can also reduce absorption and may result in adverse interactions, which can be harmful to your health.