Take at most one effervescent tablet a day. Take tomson bianjian effervescent tablets as an example. An effervescent tablet contains 450mg of vitamin C, which is actually enough to meet our daily vitamin intake. In addition to effervescent tablets, we can usually eat more foods rich in vitamin C, such as lemons, kiwis, strawberries, grapes, oranges, etc. These foods are also good for vitamin supplementation.