Scarlett Johansson's The Outset Is More Than a Celebrity Beauty Brand

The Outset Firming Vegan Collagen Prep Serum ($46)

This is a firming serum that includes vegan collagen to plump and hydrate the skin. It's designed to be used both morning and night, and it prepares skin for your moisturizer — and it just so happens to be Johansson's favorite product. "My skin is completely addicted to our serum," she says. "My face doesn't look the same when I don't use it."