China Slim Tea is a herbal tea that is marketed as a weight loss and detox aid. While some people may experience weight loss from drinking this tea, there is no scientific evidence to support its effectiveness. It is generally safe to drink this tea in moderation, but it is always a good idea to consult with a healthcare provider before starting any new supplement or medication regimen. As for when to drink the tea, the manufacturer suggests drinking it twice daily, once in the morning and once in the evening. However, it is ultimately up to the individual to determine the best time for them to drink the tea based on their own schedule and preferences.