Double strength rennet for cheese making Type of rennet used by most commercial cheese makers 1/4 teaspoon will set 2 gallons of milk in approximately 45 minutes Sets approximately 48 gallons of milk per ounce of rennet Double strength, NON-GMO, gluten free pure chymosin rennet produced by submerged fermentation on a vegetable substrate. This rennet can be used for producing any type of cheese; hard, semi-hard, soft, mold-ripened, low-fat and ingredient cheeses. Liquid rennet is easy to measure and add to milk, which makes it a favorite for both beginner and advanced cheese makers alike.