For those with a full head, hair is consumers’ most treasured asset. Its color, texture, length and style serve as much a physical attribute that elevates their looks as it does the main marker of their identity. Because healthy hair grows from the scalp, there has been growing interest in scalp health in the last year, and it’s a trend that isn’t slowing. In fact, serums and scrubs are the moment’s fastest-growing scalp care products in the US, per Spate‘s Popularity Index. Scalp Se...