It is generally recommended to follow the instructions on the packaging of China slim tea when it comes to how often it should be consumed. In general, it is best to limit consumption of any herbal tea, including China slim tea, to no more than 3 cups per day. It is also important to keep in mind that herbal teas, including China slim tea, are not intended to be a replacement for a healthy diet and regular exercise. It is always best to consult with a healthcare provider before starting any new herbal tea regimen.