This type of prayer has many miracles assosiated with it. There are stories of miracles happening all over the would because of the holy Eucharist.

In the Eucharistic miracle
at Bois-Seigneur-Isaac, the
consecrated Host bled and
stained the corporal.
On May 3, 1413, the Bishop
of Cambrai, Peter d’Ailly,
authorized the devotion of
the Holy Relic of the miracle
along with a solemn
procession. The first procession
took place in 1414.
On January 13th, 1424,
Pope Martin V approved the
building of the Monastery
of Bois-Seigneur-Isaac. Today
the monastery is the goal of
pilgrimages. The corporal
stained with Blood is exposed
to view in the chapel.

On May 8, 1902,
La Montagne, the volcano
at the peak of Mount Pelée
suddenly erupted. A discharge
of lava immediately reached
the city of Saint-Pierre de la
Martinique and completely
destroyed it. That day, the
eruption mysteriously spared
the village of Morne-Rouge,
located between Saint-Pierre
and Mount Pelée.
The prodigious event was
accompanied by an apparition
of Jesus and His Sacred Heart
in the Host exposed for
public Eucharistic adoration.
There were many witnesses
to that extraordinary
phenomenon.

In the Eucharistic miracle
of Dijon, a lady purchased a
monstrance which by mistake
still contained the Sacred
Host. The lady decided to use
a knife to remove the Host,
from which living Blood
began to flow. The Blood
dried immediately, leaving
imprinted on the Host, the
image of the Lord seated on a
semicircular throne with some
of the instruments of the
Passion at His side. The
Host remained intact for
more than 350 years, until
the Host was destroyed by
the revolutionaries in 1794.