Dear Customer, 

Thank you for reaching out to us, numbuzin!

It's best to apply the serums from light to thick texture, so we would recommend no.3, no.5 and no.6 serum in order:)

Thank you 

Best Regards, 

numbuzin customer support

[ Original Message ]

I purchased the No 3, No 5, and No 6 serums. What is the best order to apply the serums? Since No 6 is a "mask" should it be the last serum applied? Or should it be the first serum applied since it should be from light to thick texture?  Thanks