Limited evidenceGut health

Gluten-Digesting Enzymes (DPP-IV)

Enzymes sold to break down gluten after accidental exposure. Some of them do degrade gluten in the stomach, but no trial has shown they protect people with celiac disease, and they are not a licence to eat gluten.

Evidence last reviewed: August 2026

What the science says

Gluten degradation in the stomach Moderate evidence
A randomized study in healthy volunteers showed that an Aspergillus niger-derived prolyl endoprotease (AN-PEP) degraded most of the gluten in a liquid meal before it reached the small intestine. A second randomized trial confirmed the same effect in a complex, solid meal.
Protection for celiac patients Limited evidence
The best-designed trial of a therapeutic glutenase (latiglutenase, far stronger than supermarket enzyme blends) found no difference from placebo in villous atrophy or symptoms in symptomatic celiac patients. There is no evidence that over-the-counter DPP-IV blends prevent damage from gluten.
Non-celiac gluten sensitivity Limited evidence
Evidence here is limited to small crossover studies with inconsistent symptom outcomes, and no adequately powered trial of a commercial DPP-IV product exists.

Dosage & safety

Studied doseTrials of AN-PEP used roughly 1,600–2,400 PPI units taken with the meal. Commercial DPP-IV blends state their doses in DPPU per capsule and are taken at the start of a gluten-containing meal; these label doses have not been tested against the trial doses.

SafetyGenerally well tolerated; the main risk is behavioral, not toxicological — people with celiac disease may relax a gluten-free diet in the false belief that they are protected. Not a treatment for celiac disease or wheat allergy.

Scientific references

Randomised clinical study: Aspergillus niger-derived enzyme digests gluten in the stomach of healthy volunteers
Salden BN, Monserrat V, Troost FJ, Bruins MJ, Edens L, Bartholomé R, Haenen GR, Winkens B, Koning F, Masclee AA — Aliment Pharmacol Ther, 2015
Randomized clinical trial: Effective gluten degradation by Aspergillus niger-derived enzyme in a complex meal setting
König J, Holster S, Bruins MJ, Brummer RJ — Sci Rep, 2017
No Difference Between Latiglutenase and Placebo in Reducing Villous Atrophy or Improving Symptoms in Patients With Symptomatic Celiac Disease
Murray JA, Kelly CP, Green PHR, Marcantonio A, Wu TT, Mäki M, Adelman DC — Gastroenterology, 2017

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