Vitamin C Serum for Skin (ascorbic acid) is one of the best ingredients for the skin. However, some formulations can be irritating.
Here I explain how to use Vitamin C Serum Hyaluronic Acid on the face and take precautions to avoid skin irritation. Also, I talk about using vitamin C when out in the sun. And I comment on how to protect cosmetic products with vitamin C to prevent deterioration in this article: https://dermaskincare1.wordpress.com/2021/08/27/use-vitamin-c-on-face-without-irritation/