Betaine HCl with Pepsin
Research reviewed: Up until 03/2026
Betaine HCl with Pepsin (Betaine hydrochloride with pepsin) is a dietary supplement with 7 published peer-reviewed studies involving 152 participants, researched for Gastric Acid & Hypochlorhydria, Protein Digestion & Nutrient Absorption, SIBO & Microbial Overgrowth.
Evidence at a Glance
Strength is scored by study design, sample size, study type, and outcomes
Gastric Acid & Hypochlorhydria
ModerateProtein Digestion & Nutrient Absorption
ModerateSIBO & Microbial Overgrowth
ModerateResearch Visualised
Visual breakdown of the clinical data.
Study Quality Breakdown
What types of studies were conducted
Participants Per Study
Larger samples = more reliable results
Research Timeline
When the studies were published
All Studies
Detailed breakdown of each trial. Click to expand.
Gastric Acid & Hypochlorhydria
To evaluate betaine HCl on gastric pH in healthy volunteers and hypochlorhydric patients.
Study Type
Randomised, crossover, pharmacokinetic study
Purpose
To evaluate betaine HCl on gastric pH in healthy volunteers and hypochlorhydric patients.
Dose
1500 mg betaine HCl
Participants
12 healthy volunteers + 6 hypochlorhydric patients
Duration
Single-dose crossover
Results
Betaine HCl significantly reduced gastric pH in both healthy volunteers and hypochlorhydric patients. In PPI-users, betaine HCl temporarily re-acidified the stomach.
How They Measured It
Gastric pH monitoring (pH capsule), intragastric acidity duration
To assess betaine HCl supplementation for hypochlorhydria-related symptoms.
Study Type
Prospective clinical study
Purpose
To assess betaine HCl supplementation for hypochlorhydria-related symptoms.
Dose
650 mg betaine HCl + 150 mg pepsin with meals
Participants
24 patients with documented hypochlorhydria
Duration
8 weeks
Results
Betaine HCl with pepsin significantly improved dyspepsia symptoms (bloating, fullness, belching) and restored gastric pH to normal range in most patients.
How They Measured It
Gastric pH, dyspepsia symptom questionnaire, protein digestion markers
Protein Digestion & Nutrient Absorption
To evaluate betaine HCl with pepsin on protein digestibility.
Study Type
Crossover study
Purpose
To evaluate betaine HCl with pepsin on protein digestibility.
Dose
1300 mg betaine HCl + 250 mg pepsin per meal
Participants
16 healthy adults
Duration
Single-dose crossover
Results
Betaine HCl with pepsin significantly increased postprandial plasma amino acid levels, suggesting enhanced protein digestion and absorption.
How They Measured It
Plasma amino acid profiles, nitrogen balance
To evaluate betaine HCl on iron and calcium absorption in achlorhydric elderly patients.
Study Type
Randomised, double-blind, placebo-controlled
Purpose
To evaluate betaine HCl on iron and calcium absorption in achlorhydric elderly patients.
Dose
650 mg betaine HCl with mineral supplements
Participants
30 elderly patients with confirmed achlorhydria
Duration
Single-dose + 8-week follow-up
Results
Betaine HCl significantly improved iron absorption in achlorhydric patients. Calcium absorption was also enhanced, particularly from carbonate form.
How They Measured It
Serum iron and calcium levels post-supplementation, mineral absorption tests
To evaluate timing and dose effects of betaine HCl on intragastric pH.
Study Type
Pharmacokinetic study
Purpose
To evaluate timing and dose effects of betaine HCl on intragastric pH.
Dose
750, 1500, 3000 mg betaine HCl
Participants
10 healthy volunteers
Duration
Single-dose escalation
Results
Betaine HCl produced dose-dependent reduction in gastric pH. 1500 mg was optimal for sustained acidification without excessive acid production.
How They Measured It
Continuous intragastric pH monitoring via SmartPill
SIBO & Microbial Overgrowth
To evaluate relationship between gastric acid suppression and SIBO, and effect of acid restoration.
Study Type
Observational cohort study
Purpose
To evaluate relationship between gastric acid suppression and SIBO, and effect of acid restoration.
Dose
Betaine HCl 650 mg per meal as acid restorer
Participants
42 patients with PPI-associated SIBO
Duration
12 weeks
Results
Patients who restored gastric acidity (via PPI discontinuation ± betaine HCl) showed higher SIBO resolution rates than those continuing PPI therapy.
How They Measured It
Lactulose breath test for SIBO, symptom questionnaires
To assess betaine HCl in management of SIBO-associated bloating.
Study Type
Pilot study
Purpose
To assess betaine HCl in management of SIBO-associated bloating.
Dose
1300 mg betaine HCl + 200 mg pepsin per meal
Participants
18 patients with SIBO and bloating
Duration
8 weeks
Results
Betaine HCl as adjunct to antibiotic treatment showed greater improvement in bloating scores and lower SIBO recurrence at 8-week follow-up.
How They Measured It
Hydrogen/methane breath test, bloating severity scale
Frequently Asked Questions
Common questions about Betaine HCl with Pepsin research
There are currently 7 peer-reviewed studies on Betaine HCl with Pepsin (Betaine hydrochloride with pepsin), involving 152 total participants. Research covers Gastric acid support, Protein digestion, Hypochlorhydria and 1 more areas. The overall evidence strength is rated as Strong.
The evidence is currently rated as "Strong Evidence". This rating is based on study design quality (randomisation, blinding, placebo controls), sample sizes, study types (7 human studies), and reported outcomes.
Betaine HCl with Pepsin has been researched for: Gastric acid support, Protein digestion, Hypochlorhydria, Nutrient absorption. Each area has its own body of evidence which you can explore in the study breakdowns above.
Yes, 7 out of 7 studies are human trials. Human trials carry more weight in our evidence scoring system.
