COSRXThe Vitamin C 13 Serum

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.