My personal skin care tip: Vitamin serum recommendation!

I've been struggling with my dull complexion and blemishes lately, so I started using COSRX Advanced The Vitamin C 23 Serum. The product's biggest advantage is its high content of pure vitamin C, at 23%, which delivers a noticeable brightening effect in a short period of time. Initially, I felt a slight tingling sensation and a distinct vitamin scent, but after it was absorbed, my skin felt plump and supple, which was very satisfying.

Here are some skin care tips I've personally learned: Since this is a high-concentration vitamin product, refrigerating it to prevent oxidation is crucial for maintaining freshness. Also, for those with sensitive skin, rather than applying too much at first, it's better to mix a drop or two of the serum with your regular moisturizer and apply it gradually to allow time for it to adjust. Lastly, if you use this serum during the day, it's essential to thoroughly apply sunscreen to protect the vitamin C from UV rays. After using it consistently for about two weeks, I've definitely noticed a brighter skin tone, so I highly recommend it to anyone looking for a cost-effective, high-performance serum.