COSRXThe Vitamin C 13 Serum

It is true that the serum smells a little, but that is simply what ascorbic acid does, you have to take that into account. It is important to store it in the refrigerator after opening so that it does not oxidize. The packaging is also appropriate, since you should not put too much vitamin C on your face. I use it several times a week and I see the results, my skin is not as tired, red and looks healthier overall. I have also noticed an improvement in fine wrinkles.

Very runny and slightly smelly. I was surprised by it. I can't say I'm thrilled with it, but it doesn't irritate me in any way either.

It doesn't stick at all, it does what it's supposed to do 10/10

Results are visible after the first use and it absorbs quickly, but unfortunately the quantity is very small for the price.

One of the best serums I've tried. It gives a perfect glow and texture and creates that super glass skin. I highly recommend it. I think it should not be missing from any routine!!!!

It doesn't irritate, but it leaves a sticky feeling after use and my face feels tight. I'll try a different kind next time.

I am extremely satisfied with this vitamin C serum. I have sensitive, acne-prone (hormonal) skin that leans towards dryness, with lingering post-acne marks. Previously, I tried vitamin C serums from BOJ and Goodal, but they caused significant irritation and triggered acne breakouts in areas that had been clear for some time. This serum, however, has been a completely different experience. With its lower concentration of vitamin C, it didn't cause any irritation and still delivered excellent results: brighter skin, reduced post-acne scars, and a more even skin tone. A word of caution—the serum has a somewhat unpleasant smell, but don't be alarmed. This is the natural scent of pure vitamin C, free from added fragrances or unnecessary components. It’s not a sign that the product is spoiled, and you'll likely get used to it quickly. I absolutely love this serum and highly recommend it to anyone who has struggled with higher-concentration vitamin C serums.