Iowa Cosmetology Practice Exam

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Which ingredient is commonly known for its ability to hydrate skin?

Hyaluronic acid
Alcohol
Sodium lauryl sulfate
Fragrance

The correct answer is: Hyaluronic acid

Hyaluronic acid is celebrated for its exceptional ability to hydrate the skin. This ingredient is naturally occurring in the body and has the remarkable ability to retain moisture—up to 1,000 times its weight in water. This property makes it a popular choice in skincare products aimed at promoting skin hydration and elasticity. By attracting and holding onto moisture, hyaluronic acid helps to plump the skin, reducing the appearance of fine lines and contributing to a smoother, more youthful complexion. The other ingredients listed do not possess hydrating properties. Alcohol, for instance, is often used as a solvent but can strip moisture from the skin, leading to dryness. Sodium lauryl sulfate is a surfactant that cleanses but can also be harsh on the skin, potentially disrupting its moisture barrier. Fragrance, while often added for scent, does not provide hydration and may irritate sensitive skin. In contrast, hyaluronic acid is specifically valued for its moisture-retaining benefits, making it the go-to choice for effective skin hydration.