Louisiana Cosmetology Board Practice Exam 2026 - Free Cosmetology Practice Questions and Study Guide

Glycerin is well-known for its moisture retention properties and is a common ingredient in various hair products. It acts as a humectant, meaning it has the ability to draw moisture from the air into the hair and help retain it. This property makes glycerin particularly effective for keeping hair hydrated, soft, and manageable.

While coconut oil, shea butter, and aloe vera also have beneficial properties for hair, they do not serve primarily as humectants in the same way glycerin does. Coconut oil is excellent for sealing in moisture and providing nourishment, shea butter is great for conditioning and adding shine, and aloe vera is often praised for its soothing and healing qualities. However, the specific ability of glycerin to attract and hold moisture makes it the standout ingredient for moisture retention in hair care.