Cosrx Serum
- Serum
- All
- 3.4 fl oz
- Drop
- Better rated than 75%
- More reviewed than 57%
A straightforward hydrating drop serum for all skin types, worth considering as a layering step rather than a treatment product.
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How it ranks among the 293 serums we track
4.6★ across 555 Amazon ratings, Bayesian-smoothed toward the category average.
555 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
Modest tracked demand last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 293 serums we track - how the scorecard works · full serums data report. Confidence: high - strong rating volume and complete data.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
Cosrx makes a hydrating drop serum positioned as a soothing, anti-aging layering step for all skin types, packaged at 3.38 fluid ounces per bottle.
The listing keeps the ingredient story thin, so the pitch rests on the hydrating, anti-aging, soothing benefit tags rather than a headline actives claim. That works as a daily hydration layer but means shoppers hunting a specific named active, like retinol or vitamin C, should look elsewhere in the Cosrx line.
- Item form: drop serum
- Benefits: hydrating
- Addresses anti-aging and soothing
- Size: 3.38 fluid ounces
Who it's for
Suits someone building a simple hydration step for a routine that already has actives elsewhere. Not for buyers who want the serum itself to carry an exfoliating or brightening ingredient, since none is listed.
Strengths and trade-offs
Drawn from this product's published specifications.
- Formulated for all skin types
- Marketed for hydrating and soothing use
- 3.38 fl oz sized for regular use, not a trial size
- No specific active ingredient named in the listing
- No fragrance or texture detail provided
Performance notes
With item form listed as drop and skin type as all, the serum is designed to sit under a moisturizer rather than replace one, delivering hydration and soothing benefits without addressing texture or tone.
Specifications
| Brand | Cosrx |
|---|---|
| Skin Type | All |
| Size | 3.4 fl oz |
| Item Form | Drop |
| Benefits | Hydrating |
| Addresses | Anti-aging, Hydrating, Soothing |
Other Cosrx serums
How it compares
This product against the closest alternatives we track in serums.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Cosrx SerumThis product | 4.6 / 5 | 555 | 3.9 / 5 |
| Glow Recipe 2404846 SerumGlow Recipe | 4.6 / 5 | 8,400 | 4.6 / 5 |
| mixsoon 8809732910159 Serummixsoon | 4.5 / 5 | 10,127 | 4.5 / 5 |
| Beauty of Joseon 8809738312728 SerumBeauty of Joseon | 4.5 / 5 | 9,461 | 4.5 / 5 |
| medicube 8809982768524 Serummedicube | 4.6 / 5 | 5,103 | 4.5 / 5 |
Similar serums from other brands
Questions about the Cosrx serums
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
What skin type is the Cosrx serum formulated for?
The listing marks it as suitable for all skin types.
How much product comes in the bottle?
It ships in a 3.38 fluid ounce size.
What does this serum address?
Cosrx markets it for anti-aging, hydrating, and soothing benefits.