Betaine HCl

Also called betaine hydrochloride, betaine HCl with pepsin, trimethylglycine hydrochloride.

Best grade D across 2 graded outcomes Other Last checked Oct 21, 2026

The short answer

From 9 sources

Betaine HCl is an acidic salt sold to boost stomach acid. In small studies, 1,500 mg briefly dropped stomach pH in healthy volunteers whose acid was suppressed by a PPI, lasting about 75 minutes, but food blunted the effect. No trial has tested digestive symptoms, and the FDA does not recognize OTC stomach acidifiers as effective.

Every graded outcome on this page

2 rows · line = participants

Grade DRe-acidifying the stomach after a mealStomach acidn 9
Grade DGastric pH after acid suppression (healthy volunteers)Stomach acidn 6

Key facts

What it is: The hydrochloride salt of betaine; in the stomach it releases hydrochloric acid^1,5
Effect on stomach pH: 1,500 mg lowered gastric pH from about 5.2 to 0.6 within 30 minutes in 6 volunteers taking rabeprazole¹
How long it lasts: pH stayed below 3 for about 73 minutes on average¹
With food: After a meal, 4,500 mg was needed to bring pH back to baseline⁴
Regulatory status: FDA rule 21 CFR 310.540: OTC products sold as stomach acidifiers, including betaine HCl, are not generally recognized as safe and effective⁶

What it is

Betaine HCl is an acidic salt of betaine sold in capsules, often with pepsin, as a mealtime stomach-acid supplement.

How it works

Established

Betaine HCl dissolves in the stomach and releases hydrochloric acid, which lowers gastric pH for a short time. Researchers have used it to restore the acidity some weakly basic drugs need for absorption. Whether it relieves digestive symptoms has not been tested in a controlled trial.^1,2,5

Forms, side by side

2 forms named in our sources. The rest show what our data holds, and say plainly where it holds nothing yet.

Betaine HCl forms compared

2 forms

Betaine HCl forms compared: 2 forms by 3 attributes. Empty cells are labelled No data yet, or Not graded in the evidence row.
2 forms	Capsules or tablets	With pepsin
Absorption in people	Acts locally in the stomach: the acid effect began within minutes and lasted about 75 minutes after a fasting 1,500 mg dose.¹	No head-to-head human data.⁵
GI tolerance	Well tolerated by all subjects in the 6-person reacidification study; the other abstracts do not report side effects.¹	No controlled trial data.⁵
Studied for	Restoring stomach acidity for drug absorption during PPI use (single doses)	No controlled trials; discussed in a review of acid replacement in autoimmune gastritis

Betaine HCl capsules or tablets
Absorption in people
Acts locally in the stomach: the acid effect began within minutes and lasted about 75 minutes after a fasting 1,500 mg dose.¹
GI tolerance
Well tolerated by all subjects in the 6-person reacidification study; the other abstracts do not report side effects.¹
Studied for
Restoring stomach acidity for drug absorption during PPI use (single doses)
Betaine HCl with pepsin
Absorption in people
No head-to-head human data.⁵
GI tolerance
No controlled trial data.⁵
Studied for
No controlled trials; discussed in a review of acid replacement in autoimmune gastritis

What the human research says

Human trials only, one row per outcome. The form line shows what each trial actually tested. Grades follow our evidence-grading policy.

Trial map

2 graded outcomes, largest study first

2 graded outcomes: 1 improved, 1 mixed. The largest, a 2019 crossover trial of 9 people on Re-acidifying the stomach after a meal, found mixed results.

By sizeTable

1Re-acidifying the stomach after a meal

Mixed · Grade D · Crossover RCT, 9 people, 2019

Healthy adults (USA)

Dose, result and source

Every graded outcome on this page, largest study first
Outcome	Found	People	Study	Who was studied
Re-acidifying the stomach after a meal	Mixed	9	Grade D · Crossover RCT, 2019	Healthy adults (USA)
Gastric pH after acid suppression (healthy volunteers)	Improved	6	Grade D · PK study, 2013	Healthy volunteers with rabeprazole-induced low stomach acid (USA)

Every graded row

2 rows

Grade DRe-acidifying the stomach after a mealStomach acidMixedCrossover RCT
n 9 · 2019

Mixed Food raised gastric pH (peak about 3.2) and pH returned to baseline in about 50 minutes without acid; only 4,500 mg brought it back faster (about 17 minutes). Overall pH-time curves did not differ significantly between treatments.

Design: Crossover RCT, n = 9, 2019
Population: Healthy adults (USA)
Form: Betaine HCl capsules
Dose: 1,500, 3,000 or 4,500 mg after food
Duration: Single doses (4-period open-label crossover)
Source: Reference 4 · PubMed 31485804 (opens PubMed)

Grade DGastric pH after acid suppression (healthy volunteers)Stomach acidImprovedPK study
n 6 · 2013

Improved Gastric pH fell by 4.5 units (5.2 to 0.6) within 30 minutes, reaching pH below 3 in about 6 minutes; pH stayed below 3 for about 73 minutes. Well tolerated.

Design: PK study, n = 6, 2013
Population: Healthy volunteers with rabeprazole-induced low stomach acid (USA)
Form: Betaine HCl tablets or capsules (solid dose)
Dose: 1,500 mg single dose
Duration: Single dose, pH monitored for 2 hours
Source: Reference 1 · PubMed 23980906 (opens PubMed)

What the numbers add up to

Each point is worked out from the data and the sources numbered on this page, with the arithmetic shown under it. It adds no new data and is not medical advice.

The effect is short

A 1,500 mg fasting dose kept stomach pH below 3 for about 73 minutes before it rose again.¹

Food changes the picture

With a meal, 1,500 mg restored only about an eighth of atazanavir absorption, and three times that dose was needed to re-acidify after food.^3,4

No symptom trials

Every human study here measured stomach pH or drug levels; none measured indigestion, bloating or reflux.^1,2,3,4

Studied doses

Doses used in research, shown against the official limits. They describe the studies, not a recommendation for you.

Studied doses in research, not advice. These are amounts used in research, not personal advice. Your clinician or pharmacist can say what fits you.

Doses studied in human trials

Doses studied in human trials ranged from 1,500 mg to 4,500 mg as single doses in healthy volunteers, mostly during drug-induced acid suppression; no study tested daily use or digestive symptoms.^1,2,3,4

When trials measured an effect

2 outcomes

How long trials ran before effects were measured
Outcome	Measured at	Basis
Stomach pH (fasting, during PPI use)	Below pH 3 within about 6 minutes; down to about pH 0.6 within 30 minutes; stayed below 3 for about 73 minutes	Single 1,500 mg dose in 6 healthy volunteers taking rabeprazole¹
Stomach pH after a meal	Back to baseline in about 17 minutes with 4,500 mg vs about 50 minutes without acid	Crossover study in 9 healthy adults; overall pH-time curves did not differ between treatments⁴

Interactions and safety

Published interactions only: each row cites a source. No row means none was found in our sources, not that a combination is safe.

What Betaine HCl meets

2 cited rows

Medicines 2

Betaine HCl2 medicines · 0 supplements

Supplements and foods 0

No supplement rows in our sources.

Measured in a human study

Interactions

2 agents

Published interactions, grouped by kind
Agent	What the source says	Evidence
Medicines2
Proton pump inhibitors (acid reducers)e.g. rabeprazole	Betaine HCl temporarily overrode rabeprazole-induced low acidity for about 75 minutes, which is the basis of its use in drug-absorption studies.¹	PK study
Drugs whose absorption depends on stomach acide.g. dasatinib, atazanavir	Fasting betaine HCl restored dasatinib absorption during PPI use, but with a meal it restored only about 12–13% of lost atazanavir exposure.^2,3	PK study

Check with what you take

Kept on this device only

Add what you take. We list every interaction our evidence profiles cite between Betaine HCl and your picks, and between your picks.

Add a supplement or medicine

Most cited:

Add a supplement or medicine you take to check it against Betaine HCl.

Starting from one medicine? The interaction checker rates how serious each pair is, on a curated list of 19 entries for 11 medicines. This cabinet has no severity rating: it lists every interaction row our supplement pages cite.

Who should be careful

7 groups

Peptic ulcer, gastritis or excess stomach acid: Health Canada's monograph says to ask a health care practitioner before use with a peptic ulcer or excess stomach acid, and a review lists peptic ulcer disease as a contraindication for acid supplements.^7,8
People taking NSAIDs, aspirin or steroid tablets: Ulcers are mainly caused by H. pylori or NSAID use, and a review advises ruling out ulcers before any mealtime acid replacement. Anyone on regular NSAIDs, aspirin or corticosteroids should ask a prescriber first; no study has tested the combination.^5,8
People on prescription acid reducers: Betaine HCl works against the purpose of acid-reducing medicine, and its use with acid-dependent drugs has been studied only in single-dose research settings.^1,2
Self-diagnosed low stomach acid: The FDA considers low or absent stomach acid to be asymptomatic and found no adequate data that acidifiers work for it.⁶
Autoimmune gastritis: Acid replacement has been proposed in a review, not tested in a trial; the condition needs medical follow-up for B12 and iron.⁵
Liver: LiverTox has no entry for betaine HCl. Its entry for betaine itself (the prescription powder used for homocystinuria, at 6 to 20 g a day) gives likelihood score E: an unlikely cause of clinically apparent liver injury. That entry does not cover the acid released by the HCl salt.⁹
Pregnancy and breastfeeding: Health Canada advises asking a health care practitioner before use; the cited studies enrolled healthy non-pregnant adults only.^7,1

Reading the label, and the cost per dose

Compare any product you already have by the amount it delivers, not by capsule count or front-of-pack weight.

How to read the label

3 checks

Label dose vs studied dose

The fasting studies used 1,500 mg in one dose; after a meal, 4,500 mg was needed to restore baseline pH.^1,4

Marketing claims

Under 21 CFR 310.540, an OTC product promoted as a stomach acidifier needs an approved new drug application.⁶

Swallow capsules whole

Hydrochloric acid can irritate tissue and erode tooth enamel, so a review advises against opening capsules into food or drinks.⁸

Have the bottle? Photograph its Supplement Facts panel and see each line, betaine hcl included, beside the doses and forms the trials used in Label X-Ray.

Cost per studied dose, without the sales pitch

Your numbers, no product data

Price paid ($)Servings per containerBetaine HCl per serving (mg)

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Frequently asked questions

Short answers to common questions; the numbers link to the sources below.

Common questions

8 answers

Does betaine HCl help indigestion or bloating?

No controlled trial has tested it for digestive symptoms. The FDA found no adequate data that OTC stomach acidifiers work.^6,1

Does food affect betaine HCl?

Yes. After a meal, 4,500 mg was needed to restore baseline pH, and 1,500 mg with a meal barely helped drug absorption.^4,3

Who should not take betaine HCl?

People with a peptic ulcer or excess stomach acid should ask a health care practitioner first, as should anyone on NSAIDs, aspirin, steroids or acid-reducing medicines.^7,8,5

Is betaine HCl safe to take every day?

Unknown. Every human study used single doses of 1,500 to 4,500 mg; none tested daily or long-term use. A review warns that the acid can irritate tissue and erode tooth enamel if capsules are opened.^1,4,8

How long does betaine HCl last?

In the main study, stomach pH stayed below 3 for about 73 minutes after a fasting dose.¹

Can I use betaine HCl with acid-reducing medicine?

It counteracts those medicines, and combined use has been studied only in single-dose research. Anyone prescribed an acid reducer should ask their prescriber first.^1,2

Is betaine HCl the same as betaine or TMG?

Not as a product. Betaine HCl is the hydrochloride salt taken for the acid it releases; trimethylglycine (betaine) supplements are sold for other purposes and have their own page.^1,5

What does betaine HCl do?

It releases hydrochloric acid in the stomach. In healthy volunteers whose acid was suppressed, 1,500 mg lowered stomach pH within minutes for a little over an hour.¹

Sources

9 sources: trial abstracts, NIH fact sheets and reference databases. Numbers in the text link here.

Sources cited on this page

9 sources

1Gastric reacidification with betaine HCl in healthy volunteers with rabeprazole-induced hypochlorhydria.PK study Mol Pharm, 2013 · PMID 23980906
2The use of betaine HCl to enhance dasatinib absorption in healthy volunteers with rabeprazole-induced hypochlorhydria.Crossover RCT AAPS J, 2014 · PMID 25274610
3Meal Effects Confound Attempts to Counteract Rabeprazole-Induced Hypochlorhydria Decreases in Atazanavir Absorption.Crossover RCT Pharm Res, 2017 · PMID 28028768
4Food, Acid Supplementation and Drug Absorption - a Complicated Gastric Mix: a Randomized Control Trial.Crossover RCT Pharm Res, 2019 · PMID 31485804
5Creating a Framework for Treating Autoimmune Gastritis-The Case for Replacing Lost Acid.Review Nutrients, 2024 · PMID 38474790
621 CFR 310.540: Drug products containing active ingredients offered over-the-counter (OTC) for use as stomach acidifiersGuideline U.S. Food and Drug Administration (eCFR), 1988 · ecfr.gov
7Betaine / Betaine hydrochloride: natural health product monograph (risk information; dated January 30, 2026)Guideline Health Canada, 2026 · webprod.hc-sc.gc.ca
8Meal-Time Supplementation with Betaine HCl for Functional Hypochlorhydria: What is the Evidence?Review Integr Med (Encinitas), 2020 · PMID 32549862
9BetaineDatabase LiverTox (NCBI Bookshelf), 2017 · ncbi.nlm.nih.gov

What changed

Every dated change to this page: what changed, who made it and why.

Change log

4 entries

Dated changes to this page
Date	Change	Who and why
Oct 21, 2026who should avoid, FAQ, questions, time to effect, related	Added a liver note from LiverTox (no betaine HCl entry; its betaine entry scores E, unlikely cause of liver injury), time-to-effect rows from the two pH studies, a daily-use FAQ, page questions and a goal-hub link. Evidence searched on PubMed (betaine HCl or betaine hydrochloride, human studies, through October 2026): no new trials of stomach pH, digestion or symptoms since 2019, only case reports (not added). LactMed has no betaine entry; the pregnancy note stays on Health Canada's advice. Interactions re-checked: no new ones beyond the PPI and acid-dependent drug PK studies.	Writer: Kymata Health EditorialTrigger: A–Z audit against docs/supplements/AUDIT-STANDARD.md
Oct 17, 2026all	First draft. Every PMID checked against NCBI E-utilities esummary (title, journal and year taken from the record) and abstracts read for each cited row.	Writer: Kymata Health EditorialTrigger: new page
Oct 17, 2026all	Adversarial review pass: every number in each evidence row's result, dose, duration, n and population fields was machine-checked against its PubMed abstract, and figures not in an abstract were confirmed in the PMC full text (noted per row). Unverified study-country, funding and mechanism wording was removed or sourced, rows whose sample size could not be confirmed were dropped, and retraction, erratum and expression-of-concern flags were checked on every PMID (two errata, noted on their rows; no retractions). Page set indexable.	Writer: Kymata Health EditorialTrigger: review
Oct 17, 2026safety	Independent review: added peptic-ulcer, gastritis and NSAID/corticosteroid cautions (Health Canada betaine/betaine HCl monograph dated January 30, 2026; review PMID 32549862 checked via esummary), the do-not-open-capsules note, and a who-should-avoid FAQ.	Writer: Kymata Health EditorialTrigger: review

Supplement & Nutrient Encyclopedia. Educational information only; it is not medical advice and does not replace a clinician. Dietary supplements are not intended to diagnose, treat, cure or prevent any disease. Statements about supplements have not been evaluated by the FDA.

Betaine HCl

Medicines 2

Supplements and foods 0

Drugs whose absorption depends on stomach acid

Proton pump inhibitors (acid reducers)