Lanolin is a waxy substance that sheep naturally produce to protect their wool. Because lanolin's properties are similar to those of the sebum (oil) secreted by human skin, it is a popular ingredient in moisturizers. It is also widely promoted as a natural remedy for sore nipples due to breastfeeding.
During breastfeeding, your nipples may become sore, dry, and even cracked. Many healthcare providers recommend lanolin to ease nipple pain from breastfeeding. A big benefit is that it's generally considered safe for your baby to ingest small amounts of lanolin. It's recommended that you use it at least ten minutes before you start breastfeeding (or pumping). But unlike other products, you don't need to wipe it off.