Both of you should read up on the Eucharistic Miracle of Lanciano.
I have , as that is often the recourse to "where's the beef" observations, but If this is true, rather than being an artifact of medieval hucksterism, one would think that the Vatican would have DNA testing carried out on the tissue to trace the genetic origins of the person, and thus silence skeptics and bolster RC faith, rather than use some obscure poorly documented Italian medieval story.
And instead, the effect of this wafer is seen, as said, in the multitudes who walk in and walk out as before, and where Rome has predominated here so has liberalism, in contrast to the decades here of evangelicalism which takes the word of God as being what man lives by.
Or on the other end as often seen here, it effects a cultic devotion to an elitist church, and a refusal to objectively examine the evidence in order to ascertain the veracity of the claims of Rome.
When one truly receives the Lord Jesus it cannot but effect profound changes in heart and life, and these multitudes do so multitudinous times.