Taken with meals
GliadinX AN-PEP Gluten-Degrading Capsules
The one gluten enzyme with human trial data, for trace exposure when eating out, not for eating gluten.
- Format
- Capsule
- Type
- Digestive enzyme
- Cost
- $1.06 a day
- Customer rating
- 4.3 out of 5 from 287 ratings from Amazon
What customers consistently report
- Fewer reactions after restaurant meals where cross-contamination is the worry
- Peace of mind when traveling
- A capsule taken at the start of the meal rather than a regimen
Those are the themes that recur across the reviews. Low review confidence — 4.3 from 287 Amazon ratings.
Why it might work
Gluten is hard to digest because human enzymes cannot cut its proline-rich chains; AN-PEP is a prolyl endopeptidase from a mold that can, and it works in stomach acid, which most enzymes do not. Taken with a meal, it breaks gluten into fragments too small to trigger the immune response, which is why the trial measured gluten in the stomach and duodenum. Its limit is capacity: it handles trace contamination, not a slice of bread.
What the research supports
Ingredient-level evidence from a well-designed trial. In a randomized, placebo-controlled crossover study, 18 gluten-sensitive adults ate porridge containing 0.5 g of gluten with high-dose or low-dose Aspergillus niger prolyl endopeptidase (AN-PEP) or placebo: gluten measured in the stomach fell from about 177 to 22 units on the high dose, and in the duodenum from 14.1 to 6.3 (p = 0.019). The primary success criterion was met in 10 of 13 comparisons. That is degradation of a trace dose in a meal, measured directly, which no other gluten enzyme has shown in people.
What the label discloses
The listed ingredients are AN-PEP (endopeptidase), potato-derived maltodextrin, citric acid and magnesium stearate; the enzyme activity per capsule is stated on the pack rather than the listing. GliadinX states the highest concentration of the active ingredient among consumer products. No third-party testing certificate or allergen statement appears on the listing.
Who this tends to suit
We match this product to people reporting symptoms that follow particular foods, bloating, gas and general abdominal discomfort. It fits someone whose priority is handling meals or day-to-day comfort. Whether it is the best fit for you depends on the rest of your answers — what you have already tried, what format you will take, and anything that has to be ruled out.
Where it may not fit
The label supports gluten-free and no added sweeteners. A capsule only works if you will take it as often as the label directs.
Side effects and what to be aware of
It is not a license to eat gluten. The trial showed the enzyme degrades most of a small gluten dose in the stomach and duodenum; it does not make bread safe for anyone with celiac disease, and the brand says so. A minority report nausea, and a few describe strong reactions after relying on it. At about a dollar a capsule it is for occasional use.
Is this the right one for you?
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Others we researched for the same job
These sit in the same role as GliadinX AN-PEP Gluten-Degrading Capsules — taken with meals — so they are the sensible things to weigh it against.
See all the products we have researched →
Related reading
Background on how this type of product works, read from the trial evidence.