Most rennet sold today is not natural animal rennet at all. The vast majority of commercial cheese is made with Fermentation-Produced Chymosin (FPC) — a genetically engineered enzyme produced by inserting calf chymosin genes into fungi, bacteria, or yeast and fermenting them at industrial scale. FPC accounts for roughly 90% of global rennet use. It is considered by most regulatory bodies as "generally recognized as safe," but it is a product of genetic engineering and industrial fermentation, not traditional cheesemaking.
Walcoren 96P1150 is the real thing — traditional natural animal rennet extracted from calf abomasum using time-honored methods. It delivers the complete natural enzyme complex: approximately 96% chymosin and 4% bovine pepsin, plus natural lipases. This complete enzyme profile is what makes aged, artisanal cheeses develop their complex flavor characteristics over long maturation periods — characteristics that FPC rennet simply cannot replicate.
Walcoren holds ISO 22000 and FSSC 22000 food safety certifications and Halal certification. Their technical data confirms excellent microbiological standards. We are transparent that independent third-party heavy metals or contaminant testing is not publicly disclosed — but for a highly concentrated enzyme product used in small quantities for cheesemaking, the ISO and FSSC certifications provide meaningful assurance of production quality and safety.
