The functional beverage market in the United States has maintained a high growth trend in recent years, driven by consumers' pursuit of a healthy lifestyle, demand for increased energy and focus, and demand for alternatives to traditional beverages. According to Euromonitor International, the sales of functional beverages in the United States reached 28.6 billion US dollars in 2020, an increase of 5.5% year-on-year. Major brands include Coca-Cola, Sprite, Mengniu, milkshakes and vitamin water. There are two main types of functional beverages on the market, caffeine-containing beverages and caffeine-free beverages. Caffeine-containing beverages include energy drinks and vitamin drinks, while caffeine-free beverages include fruit drinks and plant protein drinks. In recent years, the market share of caffeine-free beverages in the United States has gradually increased, mainly due to increasing health awareness among consumers and growing concerns about the effects of caffeine on health. In addition, the functional beverage market in the United States has been affected by the pandemic, as consumers have a greater demand for beverages that promote immunity during the pandemic.