Kombucha’s popularity continues to surge. Sales of kombucha and other fermented beverages grew 37.4% to $556 million last year. The 5 top brands GT’s Kombucha, KeVita, Health-Ade Kombucha, Brew Dr. Kombucha and LIVE Beverages all grew by double digits. West coasters continue to be the biggest kombucha drinkers, and ginger and berry the top two best selling flavors.