Humble Catholic Servant of The Word
The Eucharistic Miracle of Lanciano

There is much on the Internet and other sources about this.

The host turned into a piece of flesh at or after consecration around 8th century A.D. It remains so until today.

In 1970, tests were conducted on it with these results:

It is indeed human flesh.
It does contain within it human blood.
It is muscle tissue.
It is tissue from a human heart!

Most Sacred Heart of Jesus, I trust in You!
Most Sacred Heart of Jesus, I love you!
Most Sacred Heart of Jesus, make my heart like Your Heart!