Cosrx

Cosrx The Vitamin C 23 Serum

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Customer reviews

5.0
It's the number one product

[This review was collected as part of a promotion.] It's the number one product for my skincare routine. I love COSRX

10/3/2026
5.0
I honestly wish I had

[This review was collected as part of a promotion.] I honestly wish I had taken a picture of my skin prior to using your product. But let me tell you there is such a difference and I’m ecstatic. They finally I have found something that’s gonna help. I have taken care of my skin, my whole life and within the last year, I have received horrible allergic reaction reactions that left scarring and this is devastating to me. A coworker shared your product and I had nothing to lose. I can’t tell you how I feel seeing my face almost being back to normal the same clear skin that I have taken care of for so many years all I can say is thank you

9/30/2026
4.0
Haven’t used yet but as

[This review was collected as part of a promotion.] Haven’t used yet but as all Cosrx products I’m sure it s terrific

9/8/2026
5.0
I love this Vitamin C.

[This review was collected as part of a promotion.] I love this Vitamin C. My husband and I are using it since we got our first bottle in Seoul and we even recommended it to our families.

7/31/2026
5.0
So far it's been only

[This review was collected as part of a promotion.] So far it's been only a few days. . got this for hyperpigmation. Will keep updating

7/27/2026
5.0
The Vitamin C serum by

[This review was collected as part of a promotion.] The Vitamin C serum by Cos-Rx is by far the best product with the most noticeable results that I have found. I love this product and this brand.

7/11/2026
5.0
I refrigerate. So refreshing in

[This review was collected as part of a promotion.] I refrigerate. So refreshing in morning. My skin feels so much better and brighter.

7/11/2026
5.0
Very smooth and absorbent when

[This review was collected as part of a promotion.] Very smooth and absorbent when put on. No odor. I keep in refrigerator. Two month shelf life. Has made my skin look brighter. I place on before snail cream and peptide booster

7/8/2026
5.0
Even skin tone

[This review was collected as part of a promotion.] I have noticed a different in my skin since using this product. I have noticed the brightening effects. My skin tone is more even with less dark spots. While I do not store the product in the fridge one it is opened, I store my unopened products in the fridge. I made the mistake of leaving an unopened one in a cabinet. It evaporated within 2 months.

7/2/2026
5.0
COSRX Vitamin C23

[This review was collected as part of a promotion.] I am 65 plus year old woman with sensitive skin. Vitamin C23 makes my skin brighter and looks smoother.

6/29/2026