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I'm going to order a vitamin C serum to use. There are 2 formulas on the web: Stabilized Vitamin C (Natural-C Glycol™) Serum and Vitamin CE Ferulic I want to know what is the difference and how ผลัดเซลล์ผิว is it a lot and can it be used every day?

I want to know how to use the serum วิตามินซี with high concentration (15-20%) will result in a thin face sensitivity to sunlight. or not