Does betaine HCl work?
There’s little proof it helps. In tiny studies it made stomachs more acid for about an hour. Trials we found didn’t test symptoms. And heartburn is acid in the wrong place, not too little.
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Does betaine HCl work?
It adds acid to your stomach for a short time. No study we found shows that it helps digestion.
Betaine HCl, short for betaine hydrochloride, is sold as a stomach acidifier. In a study of 6 healthy people on a medicine that lowers stomach acid, one 1500 mg dose took their stomach pH from 5.2 to 0.6. A lower pH means more acid.
One 1500 mg dose: more acid for about an hour
- 1
Before
Stomach pH 5.2, on an acid-lowering medicine.
- 2
About 6 minutes
pH drops below 3. That’s more acid.
- 3
First 30 minutes
pH falls as low as 0.6.
- 4
After about 80 minutes
pH stayed below 3 for about 73 minutes, then rose.
Source: Yago et al, 2013
A meal makes it harder. In a study of 9 people, it took 4500 mg, three times the dose, to undo the rise in pH from food.
Neither study asked if anyone’s indigestion got better.
In 1988 the US medicines regulator ruled there was not enough data to show stomach acid supplements work. That rule still stands.
So start with what’s behind your symptoms, not with a capsule.
Is low stomach acid causing my heartburn?
The NHS doesn’t say so. It says heartburn is caused by stomach acid travelling up towards the throat.
That burning is acid in the wrong place, not too little of it. The NHS fixes either stop acid rising or cut how much your stomach makes.
True low stomach acid is usually caused by another condition. The US regulator called it a condition with no symptoms.
| Cause | What it does | How it’s checked |
|---|---|---|
| Acid reflux | Acid travels up towards your throat and causes heartburn. | A GP may refer you for a camera test if medicines don’t help. |
| H. pylori, a stomach bug | Can cause ulcers, an inflamed stomach lining and heartburn. | A breath, poo or blood test. |
| Painkillers like ibuprofen | Regular use is one of the main causes of stomach ulcers. | Talk to your GP about other options. |
| Immune system attacking the stomach | Can inflame the stomach lining. Pernicious anaemia, the main UK cause of low B12, affects the stomach this way. | A GP may start with a blood test. |
Sources: NHS: heartburn; NHS: stomach ulcer; NHS: gastritis; NHS: B12 causes
Each cause has its own treatment, like antibiotics for H. pylori. Tired as well? Read about low B12 symptoms.
Is betaine HCl with pepsin better?
Pepsin is the main enzyme your stomach uses to break down protein. It needs acid to switch on.
The 1988 US ruling covered pepsin too. It found not enough data for it as a stomach acidifier either. We found no trial showing that adding pepsin helps.
So the answer is the same. If you still want to try it, read the safety section first.
Is betaine HCl safe?
Short tests in healthy people found no problems. Beyond that, there’s very little to go on.
| Question | What the evidence says |
|---|---|
| Side effects in studies | None reported in two short studies of 6 and 9 healthy people. |
| A safe daily dose | No NHS page gives one. |
| Long-term use | Not tested in the studies we found. |
| UK status | Sold as a food supplement. Supplements aren’t meant to treat or prevent disease. |
| On omeprazole | Tell your doctor or pharmacist about any supplements you take. |
Sources: Yago et al, 2013; Surofchy et al, 2019; FSA; NHS: omeprazole
Some websites suggest an “HCl challenge”: add a capsule at each meal until you feel burning. We found no study testing this as a way to set a dose.
Take an acid-lowering medicine, like omeprazole? Ask a pharmacist before adding an acid supplement. The NHS says to tell them about any supplements.
Never stop or change a prescribed medicine without your prescriber. Bought omeprazole yourself? The NHS says no more than 2 weeks without seeing a GP. More in blood tests on omeprazole.
What helps indigestion instead?
Six NHS steps for indigestion and heartburn
- Eat smaller, more frequent meals.
- Don’t eat in the 3 to 4 hours before bed.
- Raise the head of your bed by 10 to 20cm with wood, bricks or books, not extra pillows.
- Cut down on tea, coffee, cola and alcohol.
- Lose weight if you’re overweight, and stop smoking.
- Ask a pharmacist about antacids or alginates, pharmacy medicines that ease heartburn. Take them with food or soon after.
Antacids and alginates help in the short term, but shouldn’t be taken regularly for long periods.
Skip ibuprofen and aspirin unless they’re prescribed. The NHS says they can make indigestion worse.
For meal ideas, see foods that help digestion. Weighing up another remedy? Read about slippery elm for reflux.
When to speak to a GP
Don’t treat ongoing stomach symptoms with a supplement first. See a GP if:
- You keep getting indigestion, have heartburn most days, or lifestyle changes and pharmacy medicines aren’t helping.
- You’re in severe pain, have lost weight without trying, find it hard to swallow, or keep being sick.
- You have iron deficiency anaemia, or feel like you have a lump in your stomach.
- Call 999 or go to A&E if you’re vomiting bright red blood or vomit like ground coffee.
- Also call 999 if your poo has blood in it or is black, sticky and very smelly.
- Also call 999 if you have severe tummy pain, it’s painful to touch your tummy, or you have chest pain that started suddenly.
If your symptoms get worse at any time, contact a GP or call 111.
Bloated as well? See what a blood test for bloating can check.