— · Serum
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4.7
428 reviews
Rating breakdown
Most-mentioned keywords
Why consumers buy
Influencer and YouTuber recommendations
Many reviewers, especially in Japan, cite specific YouTubers or Korean idols ('ヒョクくん') and Instagram influencers as the reason they tried the serum.
Reputation for treating acne scars and pigmentation
A large share of buyers purchased specifically because of online reviews claiming efficacy for ニキビ跡 (acne scars) and hyperpigmentation.
Alternative to Vitamin C for sensitive skin
Several users who cannot tolerate vitamin C serums chose alpha-arbutin as a gentler brightening ingredient option.
Repeat/repurchase loyalty
Numerous reviewers note this is their 2nd-6th bottle, citing consistent results and no irritation as reasons to keep buying.
Value bundle with peptide booster
The included peptide serum and promotional set pricing (via Olive Young sales/coupons) were frequently mentioned as a deciding factor over buying full price.
How they use it
First step after cleansing
Many users apply it immediately after cleansing/toner as an essence-like step before other serums or moisturizer.
Daily AM/PM use
Skin concerns raised — and how the product addressed them
✓Most long-term users report gradual but noticeable lightening of acne scars with consistent daily use over weeks to months.
✓Reviewers note slow but steady evening of skin tone and fading of dark spots, especially when combined with sun protection.
✓The serum is largely described as gentle and non-irritating, though a minority experience mild stinging on first application.
Points to note
Sentiment breakdown
Share of analyzed reviews by overall sentiment.
Commonly used once or twice daily, with some users noting it's light enough for morning use under makeup.
Layered with other COSRX products
Frequently paired with the bundled peptide serum, niacinamide ampoule, or vitamin C serum as part of a layered routine.
Spot-treatment application
Some reviewers apply it specifically to acne scars, dark spots, melasma areas, or even armpits/back rather than the whole face.
Seasonal/storage adjustments
A few users store the product in the refrigerator in summer or note it works well as a lightweight option in hot weather.
✓Several users specifically targeting melasma report minimal to no visible improvement despite continued use.
✓Users report a brighter, more even complexion and reduced redness with regular application before makeup.
Concerns and outcomes summarized from reviews; percentages are approximate.
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