i am selling 50% used 2 bottle of face serum in which first one is (30ml 10% vitamin c face serum) and second one is (10ml 10% niacinamide face serum).
both are used 50% but it didn't suit my face that's why I'm selling it. may be it will suit for you, every person has different skin so you can try it before purchase new one. because its too expensive to buy new one.
you can see on packet lable price 649+249= 900 aprox..
This serum brand from famous Derma Co. you can check review from YouTube also. No side effect if this will not suit you because i used personally.
serum is untouched by hand because it comes with dropper.