22 years old female skin type n condition: acne prone, dry cheeks, oily nose, visible pores, blemishes, some pigmentation spots and forehead tan. Can I use recast vitamin c serum? Is this does provide any problems to my skin? And also I read that l-ascorbic acid vitamin c serums are irritant and if its not used properly will cause adverse effects. Is that so? If then pls suggest me some good vitamin c serums and how to apply without neg. Effects please. I request you dr.