The Roman Catholic Church lays down special rules for making communion bread. Wheat is the only substance put into the unleavened bread, and the Church does not allow the addition of any other substance. The maker should be a person of integrity and should make the bread with suitable instruments.
Some other Christian communities have different rules regulating the making of communion bread. For example, Luther Seminary includes honey and molasses in its communion bread recipe, two substances that the Catholic Church forbids. Some Greek Orthodox churches include theological symbolism in the making of their communion bread, such as making each loaf in two layers to represent the two natures of Christ.