What is Lanolin? In short, lanolin is a wax that's secreted by the sebaceous glands of wool-bearing animals — most notably, sheep. It's sometimes referred to "wool grease" or "wool wax" and it's responsible for keeping the animal's skin and fur protected from the elements.
"Lanolin has long been used in skin care because it is an effective emollient. It's commonly used in body creams and lotions to lock in much-needed moisture and prevent water loss," explains Dr. Hadley King, a board-certified dermatologist based in New York City. "Because of its high fat content, lanolin is occlusive, meaning it prevents the evaporation of water from the skin. This keeps skin moisturized and helps it heal."
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