Betaine HCl

Betaine Hydrochloride · Trimethylglycine Hydrochloride · Glycine Betaine Hydrochloride

Snapshot

Indications	Contraindications
Functional hypochlorhydria¹ Maldigestion or malabsorption¹ Autoimmune gastritis² Acid-suppression hypochlorhydria³	Dermal or respiratory sensitisation⁴ Look-alike name confusion⁵

Betaine hydrochloride is a short-acting acidifying agent, sold over the counter as a capsule, that supplies acid to the stomach at meals. It is taken for functional hypochlorhydria, the low stomach acid that integrative practice links to maldigestion and malabsorption. Related uses follow from restoring acidity: replacing acid lost in autoimmune gastritis² and supporting absorption of an acid-dependent medication in people on acid suppression.

Human research is limited to about seven small trials, mostly in healthy volunteers with medication-induced low stomach acid and drug absorption. A 2013 study in healthy volunteers examined gastric reacidification with betaine hydrochloride during acid suppression. In a 2017 trial, meal effects confounded attempts to counteract acid-suppression effects on atazanavir absorption⁶. A 2024 narrative review proposed mealtime acid replacement in autoimmune gastritis on theoretical and mechanistic grounds, not trial data². Products are mostly capsules, often paired with pepsin, and over fifteen thousand products list betaine hydrochloride; see Form comparison.

A 2017 Institute for Safe Medication Practices report describes medication errors from look-alike generic names for betaine anhydrous and betaine hydrochloride, which are different products.

Last updated October 15, 2026. Read how we make monographs.

In the full monograph

32 sources, 14 studies

When to useThe situations practitioners use it for, each with the reason and the study behind it.
SafetyWho should avoid it, who needs extra care, and the side effects reported in studies.
InteractionsThe medicines and supplements it interacts with, the effect of each, and what labeling says to watch.
Protocol notesThe doses used in studies, how and when they were taken, and how the forms on the market compare.
How it worksWhat it is and how it works in the body, in plain terms.
Published studiesThe studies behind each use, popular claims checked against them, and trials still under way.
Word of mouthWhat patients and practitioners report online, kept separate from the clinical evidence.
Clinical perspectiveA closing read of where the evidence is solid, where it is thin, and what has not been studied.

Snapshot

In the full monograph

Sources