Intact proteins and peptides can pass through the intestinal wall

the verdict

SUPPORTED

the evidence backs this

Recorded sources

3 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that intact proteins and peptides can pass through the intestinal wall?

Yes. Multiple studies demonstrate that certain intact peptides and proteins can cross the intestinal epithelial barrier through paracellular transport or specific carrier mechanisms, though poor permeability and enzymatic degradation generally present significant barriers.

Verdict: SUPPORTED · 3 sources for, 0 against · Last checked 4 Aug 2026

The analysis

The retrieved literature contains multiple experimental studies showing that specific dietary and bioactive peptides (such as whey protein peptides, cricket protein peptides, and gliadin peptides) can cross the intestinal epithelial barrier intact. Therefore, the claim is supported by the provided evidence.

Evidence for · 3

Identification, inhibitory mechanism and transepithelial transport of xanthine oxidase inhibitory peptides from whey protein after simulated gastrointestinal digestion and intestinal absorption.

2022

Demonstrates that specific bioactive whey protein-derived peptides (PEW and LLW) survive simulated gastrointestinal digestion and cross Caco-2 cell monolayers intact via paracellular and transporter-mediated routes.

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Qi, X., Chen, H., Guan, K., Sun, Y., Wang, R., & Ma, Y. (2022). Identification, inhibitory mechanism and transepithelial transport of xanthine oxidase inhibitory peptides from whey protein after simulated gastrointestinal digestion and intestinal absorption.. doi.org. https://doi.org/10.1016/j.foodres.2022.111959

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More for · 2

Microbial Transglutaminase Increases Uptake and Translocation of Gliadin Peptides in the Human Intestinal Epithelium

2025

Shows that gliadin peptides undergo epithelial uptake and translocation across the human intestinal epithelium, a process significantly increased by microbial transglutaminase.

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Stricker, S., Laffolie, J. d., Zimmer, K., & Rudloff, S. (2025). Microbial Transglutaminase Increases Uptake and Translocation of Gliadin Peptides in the Human Intestinal Epithelium. doi.org. https://doi.org/10.1002/mnfr.70197

Functional characterization of peptides from Acheta domesticus proteins: intestinal transport, cytotoxicity, and gene expression modulation in Caco-2 cells.

2026

Finds that cricket protein-derived peptide DVW can cross the intestinal epithelial cell model intact without disrupting overall non-cytotoxic parameters.

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Teixeira, C. S. S., Costa, J., Carriço-Sá, B., Villa, C., Mafra, I., Tavares, T. G., Faria, M. A., & Ferreira, I. M. P. L. V. O. (2026). Functional characterization of peptides from Acheta domesticus proteins: intestinal transport, cytotoxicity, and gene expression modulation in Caco-2 cells.. doi.org. https://doi.org/10.1016/j.ijbiomac.2026.150750

What does the evidence say?

Receipt History

first checked04 Aug 2026

judged → SUPPORTED · 8604 Aug 2026

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