Colief® Infant Drops Lactase enzyme drops to reduce lactose content in breast milk or infant formula. For the first few months of life some babies may have difficulty in fully digesting the lactose in milk. This can be an important factor in some babies with colic. Colief® Infant Drops helps to break down the lactose in a baby's usual milk (breast milk or infant formula) before the baby is fed, making the milk more easily digestible. Lactase Enzyme (Kluyveromyces lactis) 4,500 FCC NLU/g