Which ingredient is often used in skincare to hold moisture in the skin?

Humectants are key ingredients in skincare products designed to attract and retain moisture in the skin. They work by drawing water from the environment or deeper layers of the skin into the outer layer, helping to keep the skin hydrated and plump. Common examples of humectants include glycerin, hyaluronic acid, and urea.

In contrast, emollients primarily serve to soften and smooth the skin, creating a barrier that helps prevent water loss but do not actively draw moisture into the skin. Surfactants are primarily used for their ability to cleanse and emulsify, making them effective in formulations like cleansers but not specifically for moisture retention. Preservatives are included in skincare products to prevent microbial growth and extend shelf life, but they do not have a direct role in moisturizing the skin. Thus, humectants are specifically recognized for their moisture-retaining properties, making them the correct choice in this context.