Lactaid Fast Act Supplement contains a natural lactase enzyme that your body may not produce enough of. It works naturally and in harmony with your body to help you digest dairy. This is a dietary supplement. Not a drug, and may be used by adults and children 4 years and over. May be used every time you eat food containing dairy–every meal, every snack, every day. Keep out of reach of children. Do not use: if carton or single-serve packet is open.