Last verified: 17 days ago
Betaine HCl
Also known as: betaine hydrochloride, BHCl, trimethylglycine HCl
Evidence under review. — Not yet rated
Acidifying digestive supplement. Temporarily lowers stomach pH; may help those with low stomach acid.
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What it does
Betaine HCl is a salt form of the amino acid betaine combined with hydrochloric acid. When swallowed, it releases acid in the stomach, temporarily lowering gastric pH — useful for people whose...
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Evidence quality
Evidence base hasn't been formally rated yet. See research below.
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Clinical dose
500–1500 mg per dose based on study data
What the Science Says
Betaine HCl is a salt form of the amino acid betaine combined with hydrochloric acid. When swallowed, it releases acid in the stomach, temporarily lowering gastric pH — useful for people whose stomachs don't produce enough acid (hypochlorhydria). Clinical studies show a single 1500 mg dose can drop stomach pH by about 4.5 units within minutes, with effects lasting roughly 60–80 minutes. It has also been studied as a methyl donor to help prevent elevated homocysteine when taken alongside creatine precursors.
What It Doesn't Do
Not proven to improve digestion in people with normal stomach acid. No evidence it treats acid reflux or GERD — it could make those worse. Not a substitute for prescribed acid-reducing medications. No evidence it boosts athletic performance on its own. The single case report on post-surgery GI symptoms is not proof it works for general digestive complaints.
Evidence-Based Benefits
Temporarily lowers stomach pH in people with drug-induced low stomach acid within minutes of taking it.
Moderate EvidenceEffective at: 1500 mg single dose
Supporting studies (click to view on PubMed):
Can restore absorption of certain pH-sensitive medications when stomach acid is suppressed by PPIs.
Weak EvidenceEffective at: 1500 mg single dose (fasting conditions)
Supporting studies (click to view on PubMed):
When combined with other methyl donors, helps prevent elevated homocysteine caused by guanidinoacetic acid supplementation.
Weak EvidenceEffective at: 1600 mg/day
Supporting studies (click to view on PubMed):
Absorption & Bioavailability
Good — releases hydrochloric acid rapidly in the stomach (mean time to effect ~6 minutes in clinical studies); effect is temporary, lasting approximately 60–80 minutes
Red Flags to Watch For
- Taking it with food significantly blunts its acid-lowering effect — meal timing matters and is often ignored on product labels
- People with ulcers, gastritis, or GERD should avoid it — adding more acid can cause serious harm
- The 1500 mg dose used in clinical studies is much higher than many supplement capsules (often 500 mg); underdosing is common
- Evidence base is very small — most clinical data comes from drug-interaction studies, not general digestive health trials
- A single case report is not clinical proof — many products market it as a broad digestive cure without adequate evidence
Products Containing Betaine HCl
See how Betaine HCl is used in these analyzed products:
Frequently Asked Questions
What does Betaine HCl do?
Acidifying digestive supplement. Temporarily lowers stomach pH; may help those with low stomach acid.
What is the effective dose of Betaine HCl?
500–1500 mg per dose based on study data
Is Betaine HCl safe?
Taking it with food significantly blunts its acid-lowering effect — meal timing matters and is often ignored on product labels
What doesn't Betaine HCl do?
Not proven to improve digestion in people with normal stomach acid.
Research Sources
- PubMed
- NIH DSLD
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-05-25