Eosinophilic esophagitis due to red yeast rice (Monacoline K) in a dietary supplement for hypercholesterolemia.

We present a case of eosinophilic esophagitis (EoE) with positive skin-prick testing for type I allergy to red yeast rice (RYR, Artechol®). RYR is an over-the-counter supplement for hypercholesterolemia, since years famous in Asian countries and now also more and more popular in Western countries. The clinical relevance of IgE-mediated inflammation was proven by a rapid clearance of EoE-symptoms upon discontinuation of RYR. The role of skin-prick testing and allergy testing in general in EoE is controversial, but was of high importance in our patient. It demonstrates that in cases of a clear-cut allergy history, together with positive skin-prick (IgE) testing, a broad elimination diet can thus be avoided.