Do I use this product along with double serum or instead of? Best at night after toner?

I used to work as a cosmetician and i learnt that this oil works best when applied at night. You apply ur serum and lock it in with this oil. You do not need to apply moisturizer at all. So if you want, apply the double serum and lock it in with this oil. This was a tip from the Claris representative so pretty valid. Try it out :))