Medela Purelan 100Description Lanolin is a deeply hydrating, naturally occurring substance found in sheeps fleece. The lanolin in Purelan nipple cream is ethically sourced, using wool from mulesing free farms. It is highly purified and tested to the industrys highest standards (European and US Pharmacopoeia). When absorbed into the skin, Purelan lanolin cream mimics the skins natural ability to store moisture and can hold more than twice its weight in water naturally