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A cell-culture supplement used in manufacturing some biologics; rarely on final labels but may be disclosed.

Bovine origin; not ingested in final drug but matters to some consumers.

Insulin historically extracted from beef pancreas. Largely replaced worldwide by recombinant (rDNA) human insulin and analogues.

Bovine-derived; halal status depends on slaughter. Modern alternatives (recombinant) sidestep the question entirely.