Nature’s Response Lactase Drops break down the lactose in breast and formula milk which helps ease digestive pain and discomfort. Lactose is a complex sugar found in milk, dairy products, infant formulas and breast milk. The immature digestive system of babies can have trouble breaking down the milk into simpler sugars and our Lactase Drops aid in this process by providing what adults naturally produce. Soothing digestive complications will make your baby feel more settled at night and happier during the day. 10ml bottle with carton.