Milady Esthetics State Board Practice Test 2026 - Free Esthetics Exam Practice Questions and Study Guide

Glycerin is a prime example of a humectant because it has the ability to attract moisture from the environment and bind it to the skin. This hydrating property makes glycerin valuable in skincare products, as it helps to keep the skin hydrated and supple. Humectants like glycerin are often utilized in formulations to improve the moisture content of the skin, especially in dry conditions.

Other options provided do not function as humectants. Shea butter and coconut oil are occlusive agents, which means they form a barrier on the skin's surface, sealing in moisture but not actively attracting it. Seaweed, while beneficial for the skin due to its nutrient content, does not primarily act as a humectant in the same way that glycerin does. Therefore, glycerin stands out as the effective humectant in this context.