Certification travels with the ingredient
A kosher or halal claim on a finished product depends on every ingredient in it, including compound ingredients like flavours. A flavour is certified as a specific product code made at a specific site under a specific certifying body — not as a brand or a profile family.
That is why 'our flavours are kosher' is never a sufficient answer. You need the certificate for the code you are buying, valid for the period you are buying it in, naming the certifying body so your own certifier can accept it.
