Cosrx Serum Review
Our verdict
Cosrx Serum earns a 4.6-star average from 555 reviews at $17.50 for 3.38 fluid ounces, making it one of the better-value options in this roundup by volume-to-price ratio. It targets hydration, soothing, and anti-aging and is suited for all skin types.
Check price on AmazonBest for
Budget-friendly shoppers who want a large-bottle, multi-benefit serum from a well-known K-beauty brand covering hydration, soothing, and anti-aging in a single product.
Skip if
You need a serum with transparent active-ingredient disclosures, or you prefer a formula targeted at a single focused concern rather than a broad multi-benefit claim.
- Form Drop
- Skin type All
- Benefits Hydrating
- Targets Anti-Aging, Hydrating, Soothing
- Size 3.38 Fluid Ounces
- Priced 20% below the category median ($22.00 across 291 tracked models)
Our scorecard
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Owner rating4.6/5
4.6 average across 555 owner ratings
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Popularity2.9/5
555 owner reviews, more than most models here
The overall score is owner satisfaction weighted by how many reviews back it, so a high rating from few reviews counts for less. The bars below show where this model stands against the other anti-aging skincare: serums, night creams, facial peels, wrinkle patches and anti-aging devices we track in this category on price, popularity and size. Context, not marks against it, and our read of the data, not a lab test.
Overview
['Cosrx is one of the better-known names in Korean skincare, recognized for straightforward formulas at accessible prices. This serum at $17.50 for 3.38 fluid ounces delivers a large volume relative to its cost. The spec data lists the benefits as hydrating and the addresses as anti-aging, hydrating, and soothing, which together suggest a formula aimed at everyday use across a broad range of skin concerns.', "The drop format and all-skin-type designation make this a flexible option. 555 reviews averaging 4.6 stars is one of the strongest ratings-to-review-count combinations among the products in this group, which is a meaningful quality signal. Cosrx's broader reputation for effective, no-fuss formulas adds context to the strong buyer response.", 'The main limitation in available spec data is that no key ingredients are listed, so it is not possible to confirm whether the anti-aging benefit is delivered via retinol, peptides, niacinamide, or another active. Buyers who follow the full ingredient list closely will want to verify on the product page before purchasing.']
Pros
- 4.6 stars from 555 reviews, a strong and credible rating base
- 3.38 fl oz is a large volume for a $17.50 serum
- Multi-benefit positioning covers hydration, soothing, and anti-aging
- Drop format for easy, controlled application
- All-skin-type listing makes it broadly accessible
Cons
- No key ingredients listed in available spec data
- Very low recent purchase count may reflect listing timing or availability
- Broad multi-benefit claim without named actives is harder to verify
Specifications
- Form
- Drop
- Skin type
- All
- Benefits
- Hydrating
- Targets
- Anti-Aging, Hydrating, Soothing
- Size
- 3.38 Fluid Ounces
Performance notes
The addresses field lists anti-aging, hydrating, and soothing, which points to a formula designed to work on multiple fronts. Soothing benefits in skincare serums are often associated with ingredients like centella asiatica, panthenol, or niacinamide. Hydration addresses are typically delivered by humectants such as hyaluronic acid or glycerin. Without confirmed ingredient data, it is not possible to identify which actives are responsible for the anti-aging positioning. Cosrx formulas tend to run lightweight and layer well under moisturizers.
What buyers say
555 reviews at 4.6 stars is the strongest buyer signal in this product group. This level of consistent feedback suggests the product performs reliably across a wide range of users and skin types. Cosrx's brand trust in the K-beauty community likely contributes to buyer confidence, but the rating holding at 4.6 across that many reviews is the more objective indicator.
Similar anti-aging skincare: serums, night creams, facial peels, wrinkle patches and anti-aging devices to consider
Frequently asked questions
What are the active ingredients in Cosrx Serum?
The available product spec data does not list specific active ingredients for this serum. Given Cosrx's history of formula-forward products, the ingredient list on the Amazon product page or the brand's website will likely provide clear detail. Common Cosrx actives include snail secretion filtrate, niacinamide, and various botanical extracts.
Is 3.38 fl oz a good size for a daily serum?
Yes, 3.38 fluid ounces is a generous size for a facial serum. At a few drops per use, once or twice daily, this bottle would typically last two to three months or longer depending on how much product you apply. For a $17.50 product, that duration makes the per-use cost very low.
Can Cosrx Serum be used morning and night?
The all-skin-type listing and the hydrating, soothing benefit profile suggest this serum is designed for regular use. Without knowing the specific actives, it is hard to say definitively whether it is intended for AM, PM, or both. If it contains retinol or a strong exfoliant, PM-only use is typical. Check the usage directions on the product listing for guidance.