Once a week, and yes you can store it in the fridge if you lilke it cold or in your bathroom under the sink.
answered 1 year ago
I found it best to store the masks in the refrigerator because it feels great when you put it on. It gives it an extra kick! As far as usage goes, you can use them a few times a week, or once a month. They are a bit pricey, so i have to take that in to account, but if you've got money to spend, use them as much as you would like to!
answered 1 year, 2 months ago