On an empty stomach in the morning, before going to bed at night. Young girl's spring nest powder is an oral health care product, which mainly contains royal jelly and honey, and can play a role in maintaining ovaries, regulating menstruation, improving sleep and improving immunity. Drinking girls' spring nest powder on an empty stomach in the morning can promote the absorption of nutrients, and drinking it before going to bed at night can avoid insomnia at night. So it is best to drink on an empty stomach in the morning and before going to bed at night.