La lanolina es una cera natural producida por las glándulas sebáceas de algunos mamíferos, especialmente del ganado ovino, preparada y que se aplica para diversos usos industriales, farmacéuticos y domésticos.

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Lanolin (from Latin lāna, ‘wool’, and oleum, ‘oil’), also called wool wax or wool grease, is a wax secreted by the sebaceous glands of wool-bearing animals. Lanolin used by humans comes from domestic sheep breeds that are raised specifically for their wool. Historically, many pharmacopoeias have referred to lanolin as wool fat (adeps lanae); however, as lanolin lacks glycerides (glycerol esters), it is not a true fat. Lanolin primarily consists of sterol esters instead. Lanolin's waterproofing property aids sheep in shedding water from their coats. Certain breeds of sheep produce large amounts of lanolin. There is an inverse correlation between fiber diameter and wool wax content. Lanolin’s role in nature is to protect wool and skin against the ravages of climate and the environment; it also seems to play a role in skin (integumental) hygiene. Lanolin and its many derivatives are used extensively in products designed for the protection, treatment and beautification of human skin.

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