— · Serum
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4.8
162 reviews
Rating breakdown
Most-mentioned keywords
Why consumers buy
High-concentration vitamin C at affordable price
Consumers frequently cite the 23% pure vitamin C concentration paired with competitive pricing as a primary purchase driver, with many noting excellent value-for-money compared to other vitamin C serums on the market.
Influencer and brand reputation recommendations
Multiple reviews mention purchasing based on YouTuber recommendations and trust in the COSRX brand, indicating strong social proof and influencer marketing impact.
Repurchase for proven efficacy
A significant number of reviews indicate repeat purchases (2nd, 3rd, or 4th bottle), with consumers returning after experiencing visible brightening and pore-minimizing results.
Reformulation addressing previous concerns
The updated formula (addressing odor and oiliness from the previous version) motivated previous users to repurchase and new customers to try with confidence.
Seasonal skin concern targeting
Some consumers purchased specifically for summer skincare routines or to address seasonal concerns like pore visibility and uneven skin tone.
How they use it
Morning application after toner or prep serum
Most users apply the product in the morning as an early step in their skincare routine, often after a hydrating toner or prep product to buffer potential irritation.
Points to note
Sentiment breakdown
Share of analyzed reviews by overall sentiment.
Refrigeration required for stability and efficacy
Consumers consistently store the product in the refrigerator and note this is necessary for maintaining freshness and maximizing effectiveness, with some finding the cool application pleasant.
Layering with calming products for sensitive skin
Sensitive-skin users apply moisturizing or peptide serums before or after the vitamin C to reduce stinging, indicating a buffering strategy is common practice.
Frequent daily use, sometimes with breaks
Most use it daily, though some reduce frequency (every few days) or take breaks when experiencing irritation, adapting to their skin's tolerance level.
Small amount per application
Reviews note that a little goes a long way, suggesting users apply conservative amounts to manage the sticky texture and potential irritation.
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