Holy Church’s Canon Law closely follows Holy Church’s infallible teaching when it comes to discipline of the sacraments.
The Church’s doctrine holds that valid matter for the Eucharist is a form of bread made from wheat. In the Latin Church this means a wheaten bread, unleavened, without additives.
Several centuries ago, when Jesuits were experimenting with inculturation in Eastern Asia. it was reaffirmed that we cannot use rice cakes or wafers. We must use wheat.
More recently, when we began to understand more about the celiac condition some few people suffer from, we developed extremely low-guten hosts which are still valid matter for the Eucharist. They are extremely low in gluten, but they are from wheat. If they were not from wheat, they would not be valid matter.
Recently I learned that a company is peddling hosts which not of wheat, they are bereft of wheat, they are wheatless, there ain’t no wheat in ’em, they are ex-wheat hosts.
Here are the ingredients:
Filtered Water, Sweet Rice Flour, Potato Flour, Organic Palm Fruit Oil, Potato Starch, Methylcellulose, Sunflower Lecithin.
Were I to learn that these non-wheat wafers were being used in my parish, for anyone at anytime, I would send a list of the ingredients to the pastor of the parish, with copies to the local bishop and the Congregation for the Doctrine of the Faith.
It is absolutely imperative that any use of these things be stopped.
Fr. Kirby at Vultus has more on this. He must have been the source of what I received.