Ohio Cosmetology License Practice Exam

Glycerin is a humectant, which means it has the ability to attract moisture from the environment and bind it to the hair. This makes it an excellent ingredient for hair products aimed at adding and retaining moisture. It helps to keep hair hydrated and can improve the overall texture and appearance, providing a smoother and more manageable quality. Glycerin is particularly useful in formulations for clients with dry or damaged hair, as it helps to maintain optimal moisture levels.

In contrast, sulfates are primarily surfactants used for cleansing and can strip moisture from the hair, which may lead to dryness. Vitamins, while beneficial for overall hair health and often included for their nourishing properties, do not directly contribute moisture in the same way that glycerin does. Silicones create a protective coating on the hair, providing shine and reducing frizz, but they do not actively hydrate the hair like glycerin. Therefore, glycerin stands out as the best ingredient among the choices for adding moisture to hair products.