How to use dermaroller with rosemary oil

Starting to use dermaroller (1ml) on hairline with rosemay oil. I have few questions how long should i dermaroll along with weekly frequency. Also how long should I wait before applying the oil and how much time should the oil be kept on. Would also like to know other tips that has worked for you

You should dermaroll once a week and wait 24 hours before applying the rosemary oil. Let the oil sit for a few hours or overnight. Check The Beginner’s Guide for more detailed tips.