Utah Master Esthetician Practice Exam

What is the primary purpose of glycerin in skin care?

1. As a preservative

2. As an exfoliant

3. As a humectant

4. As a sunscreen

The correct answer is: As a humectant

Glycerin is primarily known for its function as a humectant in skin care products. This means it has the ability to attract moisture from the environment into the skin, helping to keep the skin hydrated and plump. By binding to water, glycerin plays a crucial role in maintaining the skin's moisture balance, which is essential for overall skin health and appearance. In formulations, glycerin often enhances the texture and feel of other ingredients, making products more effective and pleasant to use. Its hydrating properties are beneficial for various skin types, especially those that may be dry or dehydrated, making glycerin a staple in many moisturizing creams, lotions, and serums. Humectants like glycerin are important in the formulation of skin care products because they help prevent moisture loss, ensuring that the skin does not become dry or irritated. This characteristic distinguishes it from preservatives, exfoliants, or sunscreens, which have entirely different roles in skin care.