Overall, I would recommend sticking with rosehip seed oil for at least 4 weeks, which is how long it took the likes of green tea, sea buckthorn oil, and turmeric to start improving oily skin. (supernaturalacnetreatment.com)
I've listed many of the benefits of rosehip seed oil below. (beneathyourmask.com)
So you would use Rosehip Seed Oil as a base for your face serum and add a few drops of essential oils of your choice. (simplepurebeauty.com)