Translation guide
Casein is a protein found in milk. In Japanese, it is usually referred to by the loanword カゼイン (kazein).
Referring to the protein casein, especially in food, nutrition, or science contexts.
The standard Japanese term for casein, used in both everyday and technical contexts.
Milk contains casein.
Literally 'casein protein', used when emphasizing the protein aspect, common in nutritional supplements.
Casein protein is digested slowly.
Casein is the main component of cheese.