Which ingredient helps prevent a moisturizer from drying out?

• A. Humectant
• B. Emollient
• C. Antioxidant
• D. Fragrance

Answer: (A)

Humectants attract water into the outer skin layer and hold onto it, so a moisturizer stays hydrated and is less prone to drying out. They pull moisture from the air (or from deeper skin layers) into the stratum corneum, helping maintain a higher water content on the surface. This hydration boost is why they’re key for preventing a moisturizer from drying out. Common examples include glycerin and hyaluronic acid, which work best when paired with occlusives that seal in that moisture in drier environments.

Emollients soften and smooth the skin by filling spaces between cells and forming a protective, smoothing layer, but they don’t primarily draw in water. Antioxidants protect skin and the product from damage but aren’t focused on keeping moisture in. Fragrance adds scent and can irritate sensitive skin, without improving hydration.