The Duchess of Sussex is one of about 20 investors, including actress Kristin Davis, of Highbrow Hippie's first product release.

Lee, along with her friend and business partner Myka Harris, are introducing Highbrow Hippie Haircare & Wellness, solutions that curb the root causes of hair loss to promote healthy aging of hair.

For years, Meghan Markle has been a supporter of Kadi Lee, the celebrity colorist responsible for her chestnut brown locks. Now, that support has become a part of Meghan’s investment portfolio. On Thursday,

Hair is important,” Julia Roberts, who Lee recently took blonde, calls to tell me the day before the launch, “and when you know that is when you lose it.” Roberts’s hair is in excellent shape, thanks to Lee.

Meghan Markle made a "joyful" appearance at the Highbrow Hippie launch party at Gjelina in Venice, California, on Thursday, Nov. 14, a source tells PEOPLE