Oregon Esthetician State Board

What is the primary characteristic of lanolin in cosmetics?

1. It's an astringent

2. It provides emollient properties

3. It acts as a humectant

4. It's a buffering agent

The correct answer is: It provides emollient properties

Lanolin is primarily recognized for its emollient properties, which means it has the ability to soften and soothe the skin. This natural substance, derived from sheep's wool, mimics the skin's own oils and helps to create a barrier that locks in moisture. By forming a protective layer on the skin's surface, lanolin prevents trans-epidermal water loss, ensuring that the skin remains hydrated and supple. In contrast, astringents are agents that can constrict body tissues, often used to reduce oiliness or tighten the skin, while humectants attract moisture from the air and help bind it to the skin, which is not the primary characteristic of lanolin. Lastly, buffering agents help stabilize pH levels in formulations, which is not relevant to the primary function of lanolin in cosmetics. Therefore, the unique ability of lanolin to provide emollient properties makes it a valuable ingredient in many moisturizing products.