COSRX - skinlovenotes review for The Vitamin C13 Serum

I've tried the Vitamin C 23 serum which contains 23% vitamin C. This, of course, only contains 13%. Similar to the 23%, there is also a yellow tinge to the formula, but this 13% doesn't have a distinctive smell like the 23%. Thus far, it has been working well, and I have not experienced any irritation. However, the packaging still suggests that this be refrigerated, but personally, I don't like needing to refrigerate skincare products. I plan to use this diligently and hopefully use it before it oxidizes.