Dear Customer,
Thank you for reaching out to us, numbuzin!
Yes, it's okay to use them together. All numbuzIn products do not contain ingredients that conflict with each other.
Please let us know if you have any more questions, or need further assistance from us.
Thank you!
Best Regards,
numbuzin customer support
[ Original Message ]
can I layer this serum with vitamin c and retinal serum?
Glycerin 
