Look for moisturizing ingredients
Make sure your dry-scalp treatments includes one of these dermatologist-approved moisturizers: (1) humectants, like hyaluronic acid, honey, panthenol, and glycerin; (2) rich butters, like shea butter and cocoa butter; and (3) penetrating oils, like argan oil, jojoba oil, and grapeseed oil. All of these will actually help hydrate your skin, while sealants (like castor oil, olive oil, and coconut oil) help lock in moisture and prevent water loss that can lead to a disrupted skin barrier and irritation.
Consider your hair porosity
Quick lesson: Hair porosity is all about how much moisture your hair can hold. Low-porosity hair has a difficult time absorbing anything, while high-porosity hair soaks up water, creams, and custards like a sponge. That said, you can sometimes get a dry scalp, even if your hair is super low porosity and typically oily. In that case, look for lightweight serums, not oils, to help moisturize and soothe your scalp. But if your hair is high-porosity and already on the drier side, feel free to load up your scalp with heavier oils and butters to not only increase moisture but help lock in water.
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