— · Serum
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4.8
329 reviews
Rating breakdown
Most-mentioned keywords
Why consumers buy
Ingredient reputation (peptides)
Many buyers purchased specifically to add peptides to their routine, citing COSRX's reputation as an accessible, affordable way to try peptide skincare.
Repeat/repurchase habit
A very large share of reviews explicitly mention this being their 2nd, 3rd, 4th, or even 10th+ bottle, showing strong repurchase loyalty and treating it as a holy-grail staple.
Influencer and doctor recommendations
Several reviewers cite Korean/Japanese beauty influencers, YouTube channels (e.g., Doctorly), or dermatologists/skin analysts recommending the product as the reason they tried it.
Double-pack value and sales
Reviewers frequently mention buying because of the 1+1 or double-pack promotion, seeing it as good value for the large total volume (150ml x2).
Gifting
Multiple reviewers bought it as a gift for mothers, husbands, or friends, often reporting positive feedback from the recipient.
How they use it
First step after cleansing
The most common usage pattern is applying it immediately after washing/cleansing as the first step, often replacing or acting as a toner.
Booster before serum/toner
Skin concerns raised — and how the product addressed them
✓Reviewers overwhelmingly report the serum effectively hydrates and plumps skin, though a subset with very dry or mature skin feel it needs to be layered with heavier moisturizers, especially in winter.
✓Most sensitive-skin reviewers report no irritation and even soothing effects, but a minority experience mild stinging or find it doesn't suit their sensitive skin.
✓Some long-term users report firmer, more elastic skin and reduced fine lines, though several reviewers say they can't confirm anti-aging effects within their usage period.
Points to note
Sentiment breakdown
Share of analyzed reviews by overall sentiment.
Many use it as a 'booster' applied before a toner or vitamin C/retinol serum to enhance absorption of subsequent products.
Twice daily (AM/PM)
A large number of reviewers use it both morning and night as part of a daily routine, with some specifying different frequency by season (more in dry winter).
Applied beyond the face
Some reviewers extend use to the neck, hands, or even body for extra hydration.
Layering multiple pumps
Some users apply multiple pumps (3-10 pushes) or layer it 2-3 times for extra hydration, especially in dry seasons.
✓Reviewers note a smoother, plumper, more radiant/glowing complexion after consistent use, improving makeup application.
✓A few reviewers state the product does not cause breakouts and one mentions it helps keep breakouts away, though it's not marketed or widely reported as a targeted acne treatment.
Concerns and outcomes summarized from reviews; percentages are approximate.
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