West Virginia Cosmetology Board Practice Exam 2026 - Free Cosmetology Practice Questions and Study Guide

Hyaluronic acid is widely recognized for its remarkable ability to retain moisture, making it a popular ingredient in skincare products aimed at providing hydration. This compound naturally occurs in the body, particularly in connective tissues, and it has the capacity to hold up to 1,000 times its weight in water. As a result, when included in skincare formulations, hyaluronic acid helps to draw moisture into the skin, resulting in a plumper, more hydrated appearance.

In contrast, although alcohol can sometimes be found in skincare products, it often acts as a solvent and can have a drying effect on the skin. Glycolic acid is an alpha-hydroxy acid that is primarily used for exfoliation rather than hydration, promoting cell turnover and revealing fresher, brighter skin. Sulfates are cleansing agents that can strip moisture from the skin, making them less suitable for hydrating products. Therefore, hyaluronic acid stands out as the key ingredient for hydration in the context of this question.