What is a common characteristic of humectants?

Humectants are substances that have the ability to attract and retain moisture from the environment or from the deeper layers of the skin. This characteristic is essential in skincare because it helps keep the skin hydrated and plump. By drawing moisture to the skin, humectants can help improve its overall texture and appearance, making them a key ingredient in many moisturizers and hydrating products.

The ability to attract moisture is primarily due to the hygroscopic properties of humectants, which means they have a natural affinity for water. This is particularly beneficial in a variety of climatic conditions, especially in dry environments where moisture levels may be low.

In contrast, the other options do not accurately describe humectants. While some substances can repel moisture, this is not a function of humectants. Increasing viscosity pertains to the thickness or texture of a product rather than its moisture-attracting capabilities. Creating a barrier is typically a function of occlusives, which help prevent moisture loss rather than attracting moisture into the skin. Thus, the defining feature of humectants is their role in attracting moisture, making them vital for maintaining skin hydration.