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The Supplement Research Compendium
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Betaine HCl

Betaine hydrochloride

Acid-supplying supplement marketed for low stomach acid.

Preliminary evidence 🛡️Gut & Immune

✚ Updated · How we grade evidence

Evidence tier
Preliminary
Research weight
Citations
6 verified / 6
Classification
Gut & Immune
❝
What the evidence says. Graded preliminary: small pharmacology studies prove betaine HCl transiently lowers gastric pH and can rescue absorption of one acid-dependent drug, but no good RCTs show it improves digestion, nutrient status, or symptoms — and the FDA pulled its OTC digestive-aid status in 1993 for lack of proof. (Preliminary evidence: Early or small human trials; promising but not yet conclusive.)

What is Betaine HCl?

Betaine HCl (Betaine hydrochloride) is a gut and immune supplement used for temporarily re-acidifies the stomach. NutriDex grades the human evidence as Preliminary. Betaine HCl is anhydrous betaine bound to hydrochloric acid; when it dissolves it releases acid, so it is sold to people thought to have low stomach acid (hypochlorhydria). The best human data are tiny pharmacokinetic studies: in 6 volunteers made acid-low with a proton-pump inhibitor, 1500 mg betaine HCl dropped gastric pH from 5.2 to 0.6 within about 6 minutes, lasting roughly 70-75 minutes. That re-acidification restored absorption of the cancer drug dasatinib (Cmax up 15-fold), but barely helped atazanavir (about 12-13% recovery), showing the effect is real but drug-specific. No randomized trials demonstrate that betaine HCl improves digestion, protein or micronutrient absorption, or symptoms in ordinary users. The FDA removed it from over-the-counter digestive-aid use in 1993 for insufficient evidence; it now sells only as a supplement. (Note: this differs from anhydrous betaine/TMG used for homocysteine.)

Purported Benefits

✓Temporarily re-acidifies the stomach
✓May aid digestion in low stomach acid
✓Can restore absorption of some pH-dependent drugs
✓Supports protein/pepsin breakdown (mechanistic)

Evidence by outcome

The same supplement can be well-proven for one use and unproven for another — here is the human evidence graded outcome by outcome.

OutcomeEvidenceEffectStudies
Temporarily re-acidify the stomachTiny PK study (n=6): pH fell 5.2 to 0.6 in ~6 min, lasting ~70 min; effect real but transient. Preliminary ↑ benefit · large 2
Restore absorption of pH-dependent drugsRestored dasatinib (Cmax up 15x) but barely helped atazanavir (~12%); highly drug-specific. Preliminary ↔ mixed 2
Improve digestion / nutrient absorption in usersNo RCT shows symptom or absorption benefit in ordinary users; FDA pulled OTC use in 1993. No Evidence — no effect

Dosing & Compounds

Typical Dose
1500 mg anhydrous betaine HCl by mouth with a meal acutely re-acidifies the stomach; digestive-aid 'titration' regimens are traditional, not trial-validated.
Active Compounds
Betaine (trimethylglycine)Hydrochloric acid (released on dissolution)Pepsin (in combination products)

Safety & Cautions

Betaine HCl delivers acid, so it can cause heartburn, burning, nausea or stomach pain, and is unsafe in peptic ulcer disease, gastritis, GERD or anyone with active or prior ulcers. Avoid combining with NSAIDs or corticosteroids (added mucosal injury risk), and it works against acid-suppressing drugs (PPIs, H2 blockers, antacids). Because it can transiently re-acidify the stomach, it may unpredictably change blood levels of pH-dependent medicines; people on chronic prescriptions, pregnant or breastfeeding women, and those with kidney or liver disease should use only under medical supervision. Educational only — always check with your doctor or pharmacist before combining Betaine HCl with any medicine.

Key Studies

RCT Faber 2017 ✓ PubMed
Under fed conditions betaine HCl recovered only ~13% of atazanavir Cmax and ~12% of AUC lost to rabeprazole; meal effects dominated.
RCT Surofchy 2019 ✓ Full text
RCT showing food and acid supplementation interact in complex ways to alter weak-base drug absorption under hypochlorhydria.
RCT Yago 2013 ✓ PubMed
1500 mg betaine HCl re-acidified the stomach in PPI-induced hypochlorhydria: pH fell 5.2 to 0.6 within ~6.3 min, pH<3 for ~73 min (n=6).
RCT Yago 2014 ✓ PubMed
Betaine HCl restored dasatinib absorption lost to rabeprazole, raising Cmax 15-fold and AUC 6.7-fold to ~105-121% of control (n=8).
RCT Yago 2013 (Mol Pharm) ✓ Full text
Primary publication of the betaine HCl gastric reacidification pilot in Molecular Pharmaceutics; effect rapid but transient.
RCT Yago 2014 (AAPS J) ✓ Full text
Full report: betaine HCl safely reversed PPI effect on dasatinib pharmacokinetics in healthy volunteers.
6 sources cited · 6 verified Search all studies on PubMed ↗

Common questions about Betaine HCl

What is Betaine HCl used for?

Betaine HCl is most often taken for Temporarily re-acidifies the stomach, May aid digestion in low stomach acid, Can restore absorption of some pH-dependent drugs, Supports protein/pepsin breakdown (mechanistic). Acid-supplying supplement marketed for low stomach acid.

Does Betaine HCl work — what does the evidence say?

Preliminary evidence. Early or small human trials; promising but not yet conclusive. Betaine HCl is anhydrous betaine bound to hydrochloric acid; when it dissolves it releases acid, so it is sold to people thought to have low stomach acid (hypochlorhydria). The best human data are tiny pharmacokinetic studies: in 6 volunteers made acid-low with a proton-pump inhibitor, 1500 mg betaine HCl dropped gastric pH from 5.2 to 0.6 within about 6 minutes, lasting roughly 70-75 minutes. That re-acidification restored absorption of the cancer drug dasatinib (Cmax up 15-fold), but barely helped atazanavir (about 12-13% recovery), showing the effect is real but drug-specific. No randomized trials demonstrate that betaine HCl improves digestion, protein or micronutrient absorption, or symptoms in ordinary users. The FDA removed it from over-the-counter digestive-aid use in 1993 for insufficient evidence; it now sells only as a supplement. (Note: this differs from anhydrous betaine/TMG used for homocysteine.)

What is the typical dose of Betaine HCl?

1500 mg anhydrous betaine HCl by mouth with a meal acutely re-acidifies the stomach; digestive-aid 'titration' regimens are traditional, not trial-validated.

Is Betaine HCl safe? Any cautions or side effects?

Betaine HCl delivers acid, so it can cause heartburn, burning, nausea or stomach pain, and is unsafe in peptic ulcer disease, gastritis, GERD or anyone with active or prior ulcers. Avoid combining with NSAIDs or corticosteroids (added mucosal injury risk), and it works against acid-suppressing drugs (PPIs, H2 blockers, antacids). Because it can transiently re-acidify the stomach, it may unpredictably change blood levels of pH-dependent medicines; people on chronic prescriptions, pregnant or breastfeeding women, and those with kidney or liver disease should use only under medical supervision.

How many studies support Betaine HCl?

NutriDex cites 6 sources for Betaine HCl, graded "Preliminary".

Cite this page
APA

Peh, D. (2026). Betaine HCl (Betaine hydrochloride): Benefits, Dosage, Side Effects & Evidence. NutriDex — The Supplement Research Compendium. Retrieved 26 Jun 2026, from https://nutridex.info/s/betaine-hcl

BibTeX
@misc{nutridex_betaine_hcl,
  author       = {Peh, Daryl},
  title        = {Betaine HCl (Betaine hydrochloride): Benefits, Dosage, Side Effects \& Evidence},
  year         = {2026},
  howpublished = {NutriDex --- The Supplement Research Compendium},
  url          = {https://nutridex.info/s/betaine-hcl},
  note         = {Reviewed by Dr Daryl Peh, MBBS Singapore, MMed FM. Accessed 2026-06-26}
}

For medical claims, citing the underlying primary studies linked above is preferred. NutriDex is an educational reference, not medical advice.

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