Once perceived as health-conscious people by some, and very, very picky eaters by others, vegans are trending.

The Economist declared 2019 as the year of the vegan, reporting that a quarter of millennials identify as vegan or vegetarian . Outspoken celebrities like Beyoncé and Jay-Z are encouraging fans to become vegan, if not for ethical reasons, then because of health and environmental benefits. In a 2018 report, the vegan food industry recorded 20 percent growth over the previous year, with sales peaking at $3.3 billion.

This demand for all things vegan has made other industries take notice, especially beauty.

“Beauty follows food because we use a lot of the same ingredients,” said Tata Harper, the founder of a namesake natural beauty brand that’s predominantly vegan. “If they’re good to ingest, then they’re typically great to apply topically.”

Sunny Subramanian has been waiting for this moment since she introduced her Vegan Beauty Review site in 2007. An animal lover in Portland, Ore., Ms. Subramanian made the decision to go vegan 19 years ago. She cut meat, dairy and eggs from her diet; she stopped wearing leather, silk and wool.