A real but weak link, and no proof of a cure. Vitamin B1 (thiamine) helps power the nerve that tells your stomach to make acid, and severe B1 deficiency can cause nausea, vomiting and upper-belly pain. But no human trial shows that low B1 causes everyday heartburn or that B1 tablets relieve it. Most heartburn happens because the valve at the top of the stomach relaxes and lets acid escape upward.
Key takeaways
- Heartburn is mostly acid in the wrong place. It rises into the food pipe when the lower oesophageal sphincter (LES) is weak or opens at the wrong time.1
- Thiamine supports the nerve signal that switches on stomach acid. This comes from dog and laboratory studies, not from people with heartburn.3,4
- “Gastrointestinal beriberi” is a recognised form of B1 deficiency that shows up as nausea, vomiting and stomach pain, and it settles quickly with doctor-given thiamine.5,6,7
- Adults need 1.1 to 1.2 mg of thiamine a day. Dal, lobia, matar, beans, seeds, whole grains and fish cover it easily. Use our free B1 calculator to check your day.8
- A burning chest with sweating, breathlessness, or pain moving into the arm, neck or jaw can be a heart attack. Call emergency services (Pakistan: 1122).11
On this page
- What causes heartburn?
- What does vitamin B1 do in digestion?
- What does the evidence say?
- Myth vs fact
- What is gastrointestinal beriberi?
- Who is at risk of low B1?
- Best vitamin B1 foods
- Free B1 intake calculator
- Should you take a B1 supplement?
- What actually helps heartburn?
- Heartburn or heart attack?
- When to see a doctor
- FAQs
Prefer to watch? Video summary
Watch on YouTube: Your Heartburn Symptoms: Could It Be a Vitamin B1 Deficiency?
Who this guide is for: adults, especially those over 50, who get heartburn and have seen online claims that a hidden vitamin B1 shortage is to blame. We explain what the science supports, what it does not, and what to do instead.
What causes heartburn in the first place?
Heartburn is a burning pain behind the breastbone, often after a meal or when lying down. It happens when stomach contents, including acid, travel back up into the food pipe (oesophagus). Where the food pipe meets the stomach sits a ring of muscle called the lower oesophageal sphincter (LES). It opens to let food down and then closes like a one-way door. The US National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) explains that reflux disease can develop when this ring becomes weak or relaxes at the wrong time.1
This is the key point for the vitamin B1 question. For most people, heartburn is not about having “too much” or “too little” acid. It is about acid escaping to a place it does not belong. NIDDK lists extra body weight, pregnancy, smoking, a hiatal hernia and some medicines (including NSAID painkillers, certain blood pressure drugs and some asthma medicines) as factors that make reflux more likely.1
What does vitamin B1 (thiamine) do in digestion?
Thiamine is a water-soluble B vitamin. The body keeps only a small reserve, so it relies on a regular supply from food. Its active form helps cells burn glucose for energy, and nerve cells depend heavily on that process.
Part of stomach acid production is driven by nerves. The sight, smell and taste of food make the brain send messages down the vagus nerve to parietal cells, the acid-making cells in the stomach lining. This is where B1 enters the heartburn debate: if those nerves run short of fuel, the “make acid” signal may weaken. Notice, though, that this pathway is about how much acid is made, while heartburn is mostly about where the acid goes.
Is low vitamin B1 really linked to heartburn? What the evidence says
We searched PubMed in November 2026 for studies pairing thiamine with heartburn, reflux, GERD or dyspepsia, then checked every paper below against its original record. Here is all the relevant evidence, from most to least direct, with an honest rating of how much it tells us about heartburn.
| Study | Type | What it found | Relevance to heartburn |
|---|---|---|---|
| Lavers, Stefanik & Code, 19593 | Experiments in dogs | B1 deficiency markedly cut acid output driven by the vagus nerve, while acid released by direct chemical stimulation changed little. | Indirect |
| Levin, Mal’tsev & Gapparov, 19784 | Frog stomach lining and rat tissue | Deficiency suppressed acid (H+) secretion in isolated stomach lining and altered energy use in stomach cells. | Indirect |
| Donnino, 20045; Prakash, 20186 | Human case reports | Deficiency produced nausea, vomiting and abdominal pain that improved rapidly after thiamine, often given into a vein. | Limited |
| Nisar et al., 2022 (Srinagar)7 | Case series, 27 patients | Rice-eating patients with upper-gut symptoms and raised blood lactate all improved within 2 to 6 hours of thiamine treatment. | Limited |
| Clinical trials of B1 for heartburn or GERD | — | None found. The only related trial we saw injected B1 into acupuncture points for functional dyspepsia, which is a different condition and method. | No evidence |
Low B1 and heartburn: myth vs fact
| Claim you may see online | What the evidence says |
|---|---|
| “Heartburn means you have too much acid.” | Mostly myth The main problem is acid getting past a weak or relaxed valve.1 |
| “Low B1 lowers stomach acid.” | Partly true Seen in animal and lab studies. Human data are scarce.3,4 |
| “Low stomach acid is the hidden cause of heartburn.” | Unproven A popular theory that clinical studies have not confirmed. |
| “B1 tablets will stop heartburn.” | No evidence No trial has tested this. |
| “B1 deficiency can upset the stomach.” | True Known as gastrointestinal beriberi. It needs medical care.5,6,7 |
| “Washing rice again and again strips B vitamins.” | True Both rinsing and boiling in extra water that is then drained wash thiamine out.9,10 |
What is gastrointestinal beriberi?
Beriberi is the classic illness caused by a lack of thiamine. It is usually described as “wet” (affecting the heart) or “dry” (affecting the nerves). In 2004, a letter in the Annals of Internal Medicine described patients whose deficiency showed up mainly in the gut, a pattern the author named gastrointestinal beriberi.5 Typical features are:
- Nausea and repeated vomiting
- Pain or discomfort in the upper abdomen (epigastric area)
- Poor appetite
- Raised lactic acid in the blood, picked up on blood tests
A 2018 report in BMJ Case Reports advised doctors to suspect this condition when stomach symptoms fail to respond to the usual treatments.6 In a 2022 series from Srinagar, all 27 patients ate polished rice that was washed two to three times before cooking, and every one of them improved with thiamine.7 The same pattern of polished, heavily washed rice is common across Pakistan and North India.
Important: gastrointestinal beriberi is a diagnosis for a doctor, not something to treat at home. Repeated vomiting or ongoing stomach pain needs a medical assessment, because several of its causes, including the deficiency itself, can become serious.
Who is most likely to be low in vitamin B1?
True deficiency is uncommon in people who eat a varied diet. The risk rises when intake is poor, absorption is reduced or losses are high. The NIH Office of Dietary Supplements notes that up to 20% to 30% of older adults show laboratory signs of some degree of thiamine deficiency, linked to lower intake, long-term illness, many medicines and reduced absorption with age.8,12
| Group | Why the risk is higher | Sensible next step |
|---|---|---|
| Diets built on polished white rice | Milling removes the thiamine-rich outer layers, and repeated washing removes more.7,9 | Add whole grains, dal and beans. Rinse rice lightly. |
| Regular heavy alcohol use | Alcohol lowers absorption and raises losses.12 | See a doctor. Supplements are often advised. |
| After weight-loss (bariatric) surgery | Smaller meals and changed absorption.12 | Follow your surgical team’s vitamin plan. |
| Persistent vomiting, including in pregnancy | Losses outrun intake.12 | Get medical care early. |
| Long-term furosemide (a “water tablet”) | More thiamine is lost in urine.8 | Ask your doctor whether B1 should be checked. |
| Diabetes and adults over 65 | Higher losses, lower intake, more medicines.8,12 | Eat B1-rich foods daily and review medicines yearly. |
Which foods are richest in vitamin B1?
The daily target (RDA) is 1.2 mg for adult men and 1.1 mg for adult women, at every age from 19 upward. It rises to 1.4 mg in pregnancy and breastfeeding.8 Two or three good servings from the list below cover most of a day.
| Food | Serving | Thiamine | % of 1.2 mg | Easy way to eat it |
|---|---|---|---|---|
| Fortified breakfast cereal | 1 serving | up to 1.2 mg | up to 100% | Check the label for “thiamin” or “vitamin B1” |
| Alsi (flax seeds) | 1 oz / 28 g | 0.47 mg | 39% | Ground, stirred into dahi or roti dough |
| Matar (green peas) | 1 cup cooked | 0.42 mg | 35% | Matar pulao, aloo matar |
| Black or white beans | 1 cup cooked | 0.42–0.43 mg | 35–36% | Bean salad or curry |
| Sunflower seeds, raw | 1 oz / 28 g | 0.41 mg | 34% | Unsalted snack. Toasted seeds hold far less (about 0.1 mg). |
| Trout | 3 oz / 85 g | 0.40 mg | 33% | Grilled or baked |
| Brown rice | 1 cup cooked | 0.36 mg | 30% | Swap in for white rice a few days a week |
| Lobia (black-eyed peas) | 1 cup cooked | 0.35 mg | 29% | Lobia curry |
| Dal (masoor / moong) | 1 cup cooked | 0.34 mg | 28% | Daily dal with whole-wheat roti |
| Whole-wheat bread | 1 slice | 0.1 mg | 8% | Choose whole-wheat atta over maida |
| White rice (not enriched) | 1 cup cooked | about 0.03 mg | 3% | Pair with dal or matar to make up the gap |
Sources: NIH Office of Dietary Supplements (fortified cereal, trout, bread, toasted sunflower seeds)8 and USDA FoodData Central (all other values).13 Amounts vary with brand, variety and cooking.
Keep the B1 you eat: four kitchen tips
- Rinse rice lightly. In FAO data, washing raw milled rice removed roughly 22% to 59% of its thiamine.9
- Cook rice in just enough water. A US FDA study found that boiling enriched polished rice in excess water and draining it cut thiamine by 50% to 70%.10
- Choose whole grains. Whole-wheat atta, brown rice and oats keep the vitamin-rich outer layers.
- Don’t worry about normal tea. Laboratory work shows that some plant polyphenols in tea and coffee can break down thiamine, but a rat feeding study found no measurable effect on B1 status.14 Very strong tea gulped with every meal on an already low-B1 diet is the only situation worth adjusting.
Free vitamin B1 calculator: am I eating enough thiamine?
Enter what you ate yesterday (or on a typical day). The calculator adds up your thiamine from 21 common foods, compares it with the NIH daily target for your life stage and shows the easiest desi foods to close any gap. It runs entirely in your browser. Nothing is saved or sent.
1. Your daily target
2. What you ate (servings per day)
Tap + or −, or type a number. Half servings are fine.
3. Risk factors for low B1 (tick any that apply)
4. Safety check: do you have any of these right now?
How it works: servings × thiamine per serving (USDA FoodData Central and NIH ODS values), compared with the NIH RDA.8,13 The roti value is an estimate based on whole-wheat flour. This tool estimates food intake only. It cannot diagnose deficiency, which needs a blood test ordered by a doctor.
Should you take a vitamin B1 supplement for heartburn?
Not on your own. No clinical study shows that thiamine supplements ease heartburn, and relying on them can delay finding the real cause. If you belong to a higher-risk group, or have stomach symptoms that will not settle, ask your doctor whether your thiamine status should be checked. Genuine deficiency is treated with prescribed doses, sometimes by injection, not by guesswork. NIH notes that no upper limit has been set for thiamine because high intakes have not been linked to harm, but that is a reason for calm, not for self-treating.8
Two things to avoid
- Don’t stop prescribed reflux medicine (PPIs such as omeprazole, or H2 blockers) without speaking to your doctor. NIDDK notes that PPIs can heal the inflamed food-pipe lining in most people with GERD, and the NHS also advises against stopping prescribed medicine on your own.2,15
- Don’t self-test with betaine HCl pills or “vinegar shots”. Adding acid to an irritated food pipe or an undiagnosed ulcer can make things worse.
What actually helps heartburn?
The best-supported first steps involve no vitamins at all. They come from NIDDK and NHS reflux guidance:2,15
- Raise the head of your bed by about 10 to 20 cm (4 to 8 in) with blocks under the bed legs or a foam wedge, so your chest is above your waist. The NHS advises against simply piling up pillows.
- Stop eating 3 to 4 hours before bed, and eat smaller, more frequent meals.
- Lose weight if you are overweight. Extra belly fat presses on the stomach and the valve.
- Stop smoking and keep alcohol low.
- Avoid tight belts and waistbands around the stomach.
- Learn your triggers. Common ones include fried and fatty food, spicy food, citrus, tomatoes, chocolate, mint, coffee and alcohol.1
- Eat B1-rich whole foods as part of a balanced diet. It is good nutrition, even though it is not a heartburn cure.
Pharmacy antacids and reflux tablets can help short term. If you find you need them most days, or they stop working, see a doctor rather than taking more.2,15
Is it heartburn or a heart attack?
This matters far more than any vitamin. The NHS warns that a heart attack can feel like indigestion, with a burning feeling in the chest or a sense of fullness.11 Heart attacks in women, older adults and people with diabetes are especially likely to feel “unusual”. See also our guide to heart attack or heartburn warning signs.
| More typical of heartburn | Possible heart attack: call emergency services |
|---|---|
| Burning behind the breastbone after meals | Crushing, squeezing, heavy or tight chest pain |
| Sour or bitter taste, food coming back up | Pain spreading to the arm, neck, jaw or back |
| Worse when lying down or bending over | Sweating, breathlessness, nausea, light-headedness, grey or pale skin |
| Usually eases with an antacid | Not eased by rest or antacids, or keeps returning |
⚠ Emergency: don’t wait
Call emergency services straight away if chest discomfort comes with any of these:
- pain spreading to your arm, neck, jaw or back
- sweating, shortness of breath, nausea or dizziness
- pain that feels tight, heavy or squeezing
Pakistan: 1122 (Rescue) or 115 (Edhi). Elsewhere, call your local emergency number. Do not drive yourself to hospital. While waiting, sit and rest; NHS advice is to take one 300 mg aspirin if you have it and are not allergic to it.11
When should you see a doctor about heartburn?
- You have heartburn most days, or lifestyle changes and pharmacy medicines are not helping.15
- Food feels stuck, or swallowing is difficult or painful.1,15
- You have unexplained weight loss, poor appetite or frequent vomiting.1
- Urgently if you vomit blood or something like coffee grounds, or pass black, tarry stools.1
- You are in a higher-risk group for low thiamine (see Table 3) and have new digestive, nerve or memory symptoms.
Frequently asked questions
Can low vitamin B1 cause heartburn?
Possibly in some people, but it is not proven. Animal studies show that thiamine deficiency weakens the nerve signal that triggers stomach acid, and severe deficiency can cause nausea, vomiting and upper-belly pain. No clinical study shows that low B1 is a common cause of everyday heartburn.
Does vitamin B1 help with acid reflux?
No clinical trial has shown that thiamine supplements relieve acid reflux or GERD. Lifestyle changes and, where needed, doctor-prescribed medicines have much stronger evidence.
What are the signs of vitamin B1 deficiency?
Early signs can include poor appetite, weight loss, irritability, confusion and muscle weakness. More advanced deficiency can affect the nerves (tingling, weakness), the heart (swelling, breathlessness) or the gut (nausea, vomiting, abdominal pain). Deficiency must be diagnosed by a doctor.
How much vitamin B1 do I need each day?
Adult men need 1.2 mg and adult women 1.1 mg a day, with no change after age 50. The target rises to 1.4 mg in pregnancy and breastfeeding (NIH Office of Dietary Supplements). Our free B1 calculator on this page checks your day in under a minute.
Which Pakistani or Indian foods are high in vitamin B1?
Matar (green peas), lobia (black-eyed peas), dal, beans, brown rice, whole-wheat atta, alsi (flax seeds), raw sunflower seeds and fish are all useful sources. Rinse rice lightly and avoid draining its cooking water to keep more B1.
Does tea reduce vitamin B1 absorption?
Tea and coffee contain heat-stable polyphenols that can break down thiamine in laboratory tests, but an animal feeding study found no measurable effect on B1 status. Normal tea drinking is unlikely to matter. Very strong tea with every meal on a diet already low in B1 is the only case worth changing.
Can the B1 calculator tell me if I am deficient?
No. It estimates how much thiamine your food provides compared with the daily target. Low intake raises the risk of deficiency but does not prove it. Only a blood test ordered by a doctor can confirm low B1.
Is it heartburn or a heart attack?
Heartburn is usually a burning feeling after meals that eases with antacids. Squeezing or heavy chest pain, pain spreading to the arm, neck or jaw, sweating or breathlessness can mean a heart attack. Call emergency services immediately (Pakistan: 1122 or 115).
Keep reading on AI Heelth
References
- National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Acid Reflux (GER & GERD) in Adults.
- NIDDK. Treatment for GER & GERD.
- Lavers MK, Stefanik PA, Code CF. Effect of thiamine deficiency on canine gastric secretion of acid. Am J Physiol. 1959;197:253–256. doi:10.1152/ajplegacy.1959.197.2.253 (PubMed 14414652)
- Levin LG, Mal’tsev GIu, Gapparov MM. Effect of thiamine deficiency on hydrochloric acid secretion in the stomach [in Russian]. Vopr Pitan. 1978;(5):36–40. PubMed 716330
- Donnino M. Gastrointestinal beriberi: a previously unrecognized syndrome. Ann Intern Med. 2004;141(11):898–899. doi:10.7326/0003-4819-141-11-200412070-00035
- Prakash S. Gastrointestinal beriberi: a forme fruste of Wernicke’s encephalopathy? BMJ Case Rep. 2018;2018:bcr2018224841. doi:10.1136/bcr-2018-224841
- Nisar S, Tanvir M, Ganie MA, Kareem O, Muzaffer U, Wani IA. Clinical profile of patients presenting with thiamine-responsive upper-gastrointestinal upset: a pointer toward gastric beriberi. Nutrition. 2022;102:111730. doi:10.1016/j.nut.2022.111730
- NIH Office of Dietary Supplements. Thiamin: Fact Sheet for Health Professionals.
- Food and Agriculture Organization (FAO). Rice in Human Nutrition: nutrient losses during washing and cooking (Table 41).
- Gray PJ, Conklin SD, Todorov TI, Kasko SM. Cooking rice in excess water reduces both arsenic and enriched vitamins in the cooked grain. Food Addit Contam Part A. 2016;33(1):78–85. doi:10.1080/19440049.2015.1103906
- NHS. Heart attack.
- Martel JL, Doshi H, Sina RE, Franklin DS. Vitamin B1 (Thiamine). StatPearls, NIH Bookshelf; updated 31 January 2024.
- US Department of Agriculture. FoodData Central (thiamin values for cooked legumes, grains, seeds and fish).
- Murata K, Tanaka R, Yamaoka M. Reaction mechanisms of thiamine with thermostable factors. J Nutr Sci Vitaminol. 1974;20(5):351–362. J-STAGE; and Hayakawa F, Murata K. Effect of thermostable antithiamine factors on rats administered with thiamine. Vitamins (Japan). 1979;53(2):55–62. J-STAGE
- NHS. Heartburn and acid reflux.
Medical disclaimer: This article and calculator are for general education only and are not medical advice, diagnosis or treatment. Always speak to a qualified doctor before changing your diet, supplements or medicines, and never stop prescribed medicine on your own. If you think you or someone else may be having a heart attack, call emergency services immediately.
How we write: AI Heelth articles are researched from peer-reviewed studies and official health bodies (NIH, NIDDK, NHS, FAO), written in plain language and updated when the evidence changes. We say “linked to” or “may support” unless a treatment is proven. Spotted an error? Contact us.
© 2026 AI Heelth. Written by the AI Heelth Editorial Team; every reference checked against its original record in November 2026. Illustrations created for AI Heelth.
