Caffeine is safe as a food additive.

As a food additive, caffeine has been widely used in food, including coffee, cola, tea and chocolate.

Different foods have different levels of caffeine, such as 400ppm (caffeine content per kilogram of product, in milligrams) and tea (200-400ppm) (related to the method and time of making tea), such as 130mg of strong coffee, 80,100mg of lightly filtered coffee, 66mg of instant coffee, 50mg of light tea, and 45mg of cola drinks. A can of Chinese Red Bull drink 50 mg is equivalent to the caffeine content of a cup of tea after soaking for 5 minutes.

One of the characteristics of caffeine is that it does not accumulate in the human body, is absorbed within about an hour after intake, is then digested at a rate of 50%, and is gone after about 6-7 hours.

With regard to the standard of caffeine use, there are some differences among countries. However, as long as the food containing caffeine follows the requirements of the national standards for the use of food additives, the safety of the product is very guaranteed.

There is a history of caffeine intake in Chinese daily life. The history of drinking tea in China for thousands of years has fully proved that drinking several cups of tea a day is completely safe and beneficial to human health.