We will perform a physiologic double-blind, cross-over, study in which volunteers on a gluten-free diet will ingest gluten with or without colostrum.

Subject Participation and Study Duration

The study will imply 5 visits for each participant. At the second and fourth visit, they will either take gluten with colostrum powder or with a placebo. Follow-up duration will be until three days after the last study visit.

Each participant will be given daily PPI therapy (omeprazole 20 mg) at least one week before the first intervention, and for the entire duration of the study.

Each participant will be invited to fill a celiac disease patient reported outcomes questionnaire (Celiac Disease Symptoms Diary) for the 24 hours prior the study intervention and three days after. Blood and urine samples will be collected during the 24hours following each study intervention (gluten + colostrum or gluten + placebo)

Adverse events will be recorded during the entire study from enrollment to termination (termination will occur 3 days after the second challenge at the end of the PRO recording period).