COSRX Advanced The Vitamin C 23 Serum 20g
코스알엑스 어드밴스드 더 비타민C 23 세럼 20g 2입
₩ is the Korean store price; $ is what Olive Young Global lists. They often differ because the pack size or count sold overseas isn't the same — check the size on the listing before you buy.
Not a cart — nothing is sold here. I check it against what you already use: clashing actives, doubling up, and morning vs night.
Fit with your routine
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About this product
COSRX went with a dual-phase approach here — pure ascorbic acid at meaningful concentration paired with the gentler, more stable 3-O-Ethyl Ascorbic Acid, plus caffeine and panthenol, split across an oil layer and a water layer you shake together right before use. That's what lets it deliver strong brightening without oxidizing as fast as straight vitamin C serums tend to. Reviewers report visibly brighter, more even-toned skin with faded spots and a smoother, glowier texture after regular use, and call out the 1+1 set as excellent value for a high-percentage vitamin C. Keep it refrigerated and use sunscreen during the day, since the acid can increase light sensitivity.
Bottom line: a potent, dual-phase vitamin C serum that reviewers say earns its brightening reputation.
Shake gently once the dropper is attached, then apply a few drops to cleansed skin and roll in with fingertips from the center outward. Always follow with SPF if using during the day, and store refrigerated.
What reviewers say
This is COSRX's stronger vitamin C, made with actual Ascorbic Acid rather than a milder derivative, so I save it for brightening and fine lines specifically rather than everyday soothing. Fragrance-free, but I'd patch test first — it's not the gentlest option, more for skin that's already used to actives.
Asked which skin it worked for, 55% of reviewers picked combination (dry 37%, oily 8%).
44% called it gentle on their skin.
These add up to 100 — it's which answer people chose, not a score out of 100. It tells you who liked it, which isn't the same as what will suit you.
Ingredients
Key actives
What this product is working withDoes this fit what you already use?
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