Secret Ingredient: Roucou Oil

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We’ve heard about a lot of trendy ingredients used in beauty goods—agave, gold—but roucou oil?! When we found out that it’s the powerhouse behind the Davines’ Oi products that make your hair insanely vibrant and glossy, we decided to do our homework. Here’s what you need to know: Pronunciation: ru ˈku Provenance: The Amazon rainforest Derived...