Is it okay to use serum if you have an oily/sensitive type of skin?

Serum

Hi, I just brought this product. I wonder if anyone else has tried it or does it work?

Breylee Vitamin C Serum

Can you use Vitamin C serum during the day and use retinol serum during the night?

Retinol

Rejuvenating sets has become popular in my place. I've been using it for quite some time now (about 4 months). At first, the product really has stingy sensation but after a month my skin got used to it. After reading an article about products that make your skin sting, I've become concerned if I should stop using it. What should I do?

Rejuvenating Set

My skin doesn&#39;t have bad reactions and stayed normal.

Hatake