Whey and Caseinate
A dairy derivative that is halal in itself, but the cheesemaking process behind it may use animal rennet.
Why this is a critical point
Whey and caseinate are byproducts of cheesemaking. Milk itself is halal, but if the cheese it comes from was made with animal rennet of unverified origin, the whey/caseinate derived from it needs the same verification.
Halal alternative
Whey/caseinate from producers who disclose the use of microbial rennet or halal-certified animal rennet.