Whey Description DescriptionWhey is the liquid remaining after milk has been curdled and strained. It is a byproduct of the manufacture of cheese or casein and has several commercial uses. Sweet whey is a byproduct resulting from the manufacture of rennet types of hard cheese, like cheddar or Swiss cheese. Nutrition Facts Whey Whey Sources include:USDA Amount Per 100 grams 100 grams Calories 27 % Daily Value* Total Fat 0.4 g 0% Saturated fat 0.2 g 1% Polyunsaturated fat 0 g Monounsaturated fat 0.1 g Cholesterol 2 mg 0% Sodium 54 mg 2% Potassium 161 mg 4% Total Carbohydrate 5 g 1% Dietary fiber 0 g 0% Sugar 5 g Protein 0.9 g 1% Vitamin A 0% Vitamin C 0% Calcium 4% Iron 0% Vitamin B-6 0% Cobalamin 5% Magnesium 2% *Per cent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.