We have “manna” from the tomb of St. Nicholas at Bari mixed with holy water in our icon corner. It has been used to annoint gravely ill children and we have been blessed with cures! God bless the Patriarch!
Though the church in Bari is Catholic. Bari is a former Greek colony. So when Bari sailors took St. Nicholas’ bones (Santa Claus is Greek! LOL!) from Asia Minor it seems to me they were rescuing a Greek saint to lay in a Greek city’s holy church even though it was Catholic at that time - though I am not sure how Catholic or when the Greeks of Italy and Sicily switched over from Byzantine empire Orthodox to Roman Catholic.
https://www.youtube.com/watch?v=KEcxRMyXAS4
Holy Manna oozing from the St. Nicholas’ bones is being extracted in this video by the Catholic clergy and handed to the Orthodox priest. The look of reverence from all - even when the Orthodox priest removes his hat. To me this is proof the power of Christ is in both Churches and through this Saint the two Churches are connected as one.