Name: The Vitamin C 13 Serum
Brand: COSRX
Rating: 4.43 (552 reviews)

4.43

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This Korean review was translated by AI and may contain inaccuracies.

61 Reviews

뽀로로+
Apr 1, 2025
Combination SkinSensitive SkinAcne Skin
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Reviewed by Hwahae Trial Reviewers
This review was written by a Hwahae Trial Reviewer who received the product for free and evaluated it with a sense of representing Hwahae. The review is completely unbiased and honest, with no guidelines or restrictions. Trial Reviewers' reviews undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.
Pros
It was not that great 😢😢😢 The absorbency seems to be good, though... Hmm
Cons
My face became more inflamed, itchy, and irritated. It doesn't seem to agree with me.

모던한다람쥐류65525
Mar 22, 2025
Dry SkinSensitive Skin
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Reviewed by Hwahae Trial Reviewers
This review was written by a Hwahae Trial Reviewer who received the product for free and evaluated it with a sense of representing Hwahae. The review is completely unbiased and honest, with no guidelines or restrictions. Trial Reviewers' reviews undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.
Pros
I peeled off the outer cover, and it said it was good for whitening and brightening, so I applied it before bed, but my skin doesn't seem to agree with it. It's stinging, so I peeled off the outer cover and brought it to work, and I'm applying it to my feet now.
Cons
It stung and some pimple-like bumps came up on my face, so I stopped.

더원씽
Mar 4, 2025
Oily SkinSensitive SkinAcne Skin
Review under verification
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Reviewed by Hwahae Trial Reviewers
This review was written by a Hwahae Trial Reviewer who received the product for free and evaluated it with a sense of representing Hwahae. The review is completely unbiased and honest, with no guidelines or restrictions. Trial Reviewers' reviews undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.
Pros
This is my first time trying a vitamin product, and unlike others, I haven't experienced any skin issues.
Cons
There are days when it stings a bit. Hwahae Trial Reviewers recommend using it every other day rather than daily.

복합화장품유목민
Mar 2, 2025
Combination SkinSensitive Skin
Review under verification
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Reviewed by Hwahae Trial Reviewers
This review was written by a Hwahae Trial Reviewer who received the product for free and evaluated it with a sense of representing Hwahae. The review is completely unbiased and honest, with no guidelines or restrictions. Trial Reviewers' reviews undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.
Pros
The concentration may not be very high, so I'm not sure if it will improve pigmentation, but it does brighten the basic skin tone! There are many stories about vitamin irritation, so I tried it as an introductory product and found it to be quite effective, so I'd like to continue using a slightly higher concentration of vitamin.
Cons
At first, it doesn't feel like much when you apply it, but after some time has passed, you get a feeling of dryness, so it seems like applying a cream is a must. The smell is a bit unpleasant, but I continued using it because I saw the effects. Normally it's not irritating, but on days when my skin condition is really bad, there is a slight stinging sensation.
Tip
While there are certainly some drawbacks, the clear improvement in skin tone makes it worth overcoming those shortcomings, so I would recommend using it.👍🏻 I also plan to continue using it.❣️

쌍둥이자리여름
Feb 25, 2025
Dry SkinSensitive Skin
Review under verification
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Reviewed by Hwahae Trial Reviewers
This review was written by a Hwahae Trial Reviewer who received the product for free and evaluated it with a sense of representing Hwahae. The review is completely unbiased and honest, with no guidelines or restrictions. Trial Reviewers' reviews undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.
Pros
Absorption is very good and there is a slight residual stickiness peculiar to the vitamin. It seems the freckles and blemishes have faded a bit!
Cons
Originally, when I applied it directly without mixing it with the cream I usually use, it was very stinging. When applying it for the first time, adjusting the amount seems essential..!

쭹돝
Feb 15, 2025
Combination Skin
Review under verification
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Reviewed by Hwahae Trial Reviewers
This review was written by a Hwahae Trial Reviewer who received the product for free and evaluated it with a sense of representing Hwahae. The review is completely unbiased and honest, with no guidelines or restrictions. Trial Reviewers' reviews undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.
Pros
I have combination skin with flushing. I don't usually have many blemishes, but my skin is thin and prone to fine lines. If my skin doesn't stay moisturized well, it dries out quickly, so I prefer a dewy finish. The most satisfying aspect of using this product was that my face looked brighter in the morning. After applying it before bed, my skin appeared clearer when I looked in the mirror the next day. It was more of a refined skin tone effect rather than an immediate whitening effect. Many vitamin products feel heavy or sticky, but this serum is lightweight and absorbs quickly, making it easy to use both morning and night without any burden. The reasonable price is also an advantage. Vitamin serums are often expensive, making consistent use difficult, but this product can be used comfortably without much financial burden. Since it's a product that requires consistent use to see results, I think choosing a good value option is important, and in that regard, I was very satisfied.
Cons
Vitamin serums are often expected to have an immediate whitening effect, but as seen in YouTube and Instagram reviews, it can be difficult to experience dramatic whitening results. Of course, using it consistently can give a sense of improved skin tone, but using it once or twice does not necessarily make the skin significantly brighter. Another disappointing aspect is that when the skin condition is not good, using the serum can cause a stinging sensation. As I have reddish skin, my face felt slightly flushed right after application. Fortunately, this subsides over time, but it's best to avoid using it on sensitive skin days. Also, possibly due to the vitamin ingredients, a yellowish color was left on the cotton pad when cleansing the next morning. While there was no lingering serum feeling, it's a good idea to cleanse thoroughly.
Tip
This product is said to be most effective when applied immediately after cleansing, so it would be best to keep it in the bathroom and apply it right away. Also, if used together with the niacinamide product from the same line, you can see the effect of brighter skin in the morning, so if you want to focus on whitening care, it is also recommended to use them together!

관조닝
Jan 17, 2025
Oily SkinSensitive SkinAcne Skin
Review under verification
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Reviewed by Hwahae Trial Reviewers
This review was written by a Hwahae Trial Reviewer who received the product for free and evaluated it with a sense of representing Hwahae. The review is completely unbiased and honest, with no guidelines or restrictions. Trial Reviewers' reviews undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.
Pros
The formula is watery, so it flows well and is quickly absorbed, making it easy to apply!!
Cons
In the beginning, it feels irritating and requires an adjustment period. When the entire tube is used up, there is no sense of the skin becoming brighter.

ws00.han
Dec 10, 2024
Combination SkinSensitive Skin
Review under verification
The content is currently being reviewed by the Hwahae operations team, and the verification will be completed by the next business day (excluding weekends and holidays) from the date the review was written.
Reviewed by Hwahae Trial Reviewers
This review was written by a Hwahae Trial Reviewer who received the product for free and evaluated it with a sense of representing Hwahae. The review is completely unbiased and honest, with no guidelines or restrictions. Trial Reviewers' reviews undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.
Pros
Wow, why did I just realize this? I've been using this for a month, and I can definitely feel an improvement in my skin tone and texture.
Cons
At first, there may be a brief stinging sensation when applied, but it is never irritating and the product is simply good.

Quancily
Oct 24, 2024
Normal Skin
Review under verification
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Reviewed by Hwahae Trial Reviewers
This review was written by a Hwahae Trial Reviewer who received the product for free and evaluated it with a sense of representing Hwahae. The review is completely unbiased and honest, with no guidelines or restrictions. Trial Reviewers' reviews undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.
Pros
I thought I bought 23, but I was surprised to find it was only 13. It's definitely less stimulating than 23. I think those new to using it would do well to start with 13, and it's quite effective for skin pigmentation and whitening! It's better to say that the skin becomes brighter rather than whiter.
Cons
If you use it directly on bare skin, it can be irritating, so be sure to apply it as the second step after using a skin and toner.

무난무놘
Sep 17, 2024
Normal Skin
Review under verification
The content is currently being reviewed by the Hwahae operations team, and the verification will be completed by the next business day (excluding weekends and holidays) from the date the review was written.
Reviewed by Hwahae Trial Reviewers
This review was written by a Hwahae Trial Reviewer who received the product for free and evaluated it with a sense of representing Hwahae. The review is completely unbiased and honest, with no guidelines or restrictions. Trial Reviewers' reviews undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.
Pros
I slept well last night, but I feel refreshed in the morning.
Cons
I'm worried that it will drip off my palm, so I'm anxious. Even though my skin is average, it stings a little. I rarely have any acne.