How does glycerin differ from other common moisturizing ingredients like shea butter or petrolatum?

Glycerin is primarily a humectant, meaning its main function is to attract and bind water molecules from the air and deeper skin layers into the skin's surface. It helps increase hydration. In contrast, ingredients like petrolatum (petroleum jelly) are occlusives; they form a physical barrier on top of the skin to prevent water loss but do not add moisture themselves. Shea butter acts mainly as an emollient, filling in gaps between skin cells to soften and smooth the surface texture.

This cream's straightforward focus is on that humectant hydration. For very dry, cracked skin that loses moisture rapidly, a routine might layer a humectant like this glycerin cream first to pull in water, followed by an occlusive to seal it in. For everyday dryness from washing or weather, a humectant-focused product can be sufficient to help the skin feel more supple and less tight.