Medela's nipple balm is a lightweight blend of olive oil and calendula. Olive oil is a natural plant-based oil that has strong antioxidant and antimicrobial properties. Studies have shown that using olive oil regularly minimizes and may even prevent sore nipples. Calendula, more commonly known as marigold, is an herbal plant with properties that can resolve skin irritation while hydrating and rejuvenating skin damage. Calendula is also known for its calming and soothing properties. The double action of these two ingredients helps provide natural relief for sore nipples and dry skin.