Supplement analysis backed by scientific evidence · PT

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Limited evidenceGut health

Pepsin

A stomach protease usually sold with betaine HCl for people who believe they have low stomach acid. There is no controlled trial of this combination; the human literature amounts to a case report and a treatment framework paper.

Evidence last reviewed: August 2026

What the science says

  • Replacing lost stomach acid Limited evidence

    A published framework for treating autoimmune gastritis argues for replacing lost acid, including with betaine hydrochloride, while acknowledging that the supporting clinical evidence is very thin.

  • Direct clinical evidence Limited evidence

    The only direct human report is a single case describing betaine HCl with pepsin in an oesophageal cancer patient. One case report cannot establish either efficacy or safety.

  • Low stomach acid as a common problem Limited evidence

    Genuinely low stomach acid is uncommon outside specific conditions such as atrophic gastritis or long-term acid-suppressant use. No trial has shown pepsin supplements help ordinary indigestion.

Dosage & safety

Studied doseProducts typically supply 200–650 mg betaine HCl with 50–200 mg pepsin per capsule, taken with protein-containing meals. No studied dose exists.
SafetyBetaine HCl with pepsin can cause burning and worsen gastritis, reflux or ulcers, and should not be combined with NSAIDs or used by anyone with a history of ulcers. It is sourced from porcine stomach. Reflux and indigestion deserve a diagnosis rather than self-treatment with added acid.

Scientific references

Where to buy

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