Bacalhau can be kosher if it's made following the rules of
kashrut. If it's commercially made, it would have to be certified
kosher by a recognized kashrut organization.
View page
Kashrut, the Jewish dietary laws, govern the preparation and
consumption of food for Jew. There is no conflict between kashrut
and preparing food for diabetics.
View page
Mehadrin/mahadrin is a strict certification of kashrut.
View page
Garlic doesn't have anything specific to do with kashrut.