Q1: please tell me how to use it.
A1: several times a day as you like, put the lip essence on your lip after clean and dry.

Q2: can i use it with lip stick.
A2: of course, you can use it as base makeup.

Q3: can i use it before sleep.
A1: of course, if you need use it before go to sleep, i recommend the transparent one.(101YURI)

Q4: it feels like a little stimulating, is that ok?
Q4: as it contained with pepper extract and peppermint oil, if you feel quite strong, please stop to use it.