COSRX

The Vitamin C 23 Serum

162 Reviews

• 은은냣

  Jun 26, 2025 (UTC)
  Dry SkinSensitive SkinAcne Skinproduct.Atopy Skin

  Review under verification

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  OK

  Reviewed by The Hwahae Testers

  This review was written by The Hwahae Testers 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. Reviews by The Hwahae Testers undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.

  OK
  Pros

  1. Absorption: Good, moisturizes and absorbs well 2. Skin type: Combination + Sensitive 3. Application: Slight tingling, but no blemishes appeared 4. Scent: Pleasant 5. Amount: Adequate Overall: Purchased for its skin-brightening and vitamin effects, and it delivers as expected

  Cons

  Nothing particularly negative If anything, the price is a bit high Best to buy during sales

  Tip

  Great to apply before bed

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• 포스원

  Apr 29, 2025 (UTC)
  Combination SkinSensitive SkinAcne 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.

  OK

  Reviewed by The Hwahae Testers

  This review was written by The Hwahae Testers 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. Reviews by The Hwahae Testers undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.

  OK
  Pros

  I've repurchased this for the third time. Even with my sensitive, rosacea-prone skin, it works well without causing any blemishes. It's really helping to clear up my complexion.

  Cons

  The product size is too small and runs out quickly. I wish they'd either increase the volume or reduce the price a bit.

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• coney211

  Apr 1, 2025 (UTC)
  Normal Skin

  Review under verification

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  OK

  Reviewed by The Hwahae Testers

  This review was written by The Hwahae Testers 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. Reviews by The Hwahae Testers undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.

  OK
  Pros

  With consistent use, the results are impressive. My complexion has become noticeably clearer!

  Cons

  There was a slight irritation at first. Be careful, as it can leave yellow stains on clothes.

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• Sereney

  Mar 27, 2025 (UTC)
  수부지Sensitive SkinAcne 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.

  OK

  Reviewed by The Hwahae Testers

  This review was written by The Hwahae Testers 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. Reviews by The Hwahae Testers undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.

  OK
  Pros

  I've been consistently using this as part of my morning skincare routine for over a year, about one bottle every two months, 3-4 times a week. Overall, my skin has truly become healthier. After about a month, I noticed a visible improvement in my skin barrier, and my skin's elasticity also improved. As an added bonus, my old acne scars and blemishes have faded, my complexion has brightened by about one shade, and my overall skin tone looks much clearer. It's now become an essential part of my skincare routine and one of my holy grail products.

  Cons

  As someone sensitive to scents, I found the fragrance to be just refreshing. Since it's dissolved in oil, the serum itself is quite rich and needs to be absorbed well. If you apply too much, it can become very sticky, so it's important to use the right amount. I'd recommend using this on bare skin or on makeup-free days, as it might be too heavy under makeup.

  Tip

  If you know the proper way to use it, this Vitamin C serum will undoubtedly improve your skin. That's why I'm strongly recommending everyone around me to give it a try.

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• 으으윽이

  Mar 17, 2025 (UTC)
  Combination SkinSensitive SkinAcne 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.

  OK

  Reviewed by The Hwahae Testers

  This review was written by The Hwahae Testers 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. Reviews by The Hwahae Testers undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.

  OK
  Pros

  After using it, my skin texture definitely improved. My complexion became clearer.

  Cons

  The fact that it needs refrigeration. The formula was too watery and runny, making it inconvenient to apply.

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• 현대벌

  Mar 14, 2025 (UTC)
  Dry SkinAcne Skin

  Review under verification

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  OK

  Reviewed by The Hwahae Testers

  This review was written by The Hwahae Testers 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. Reviews by The Hwahae Testers undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.

  OK
  Pros

  After using it for a month, I'd say it's less about brightening and more about giving your complexion a radiant, translucent look. It really works hard to maximize your natural glow.

  Cons

  If you're prone to blemishes, I'd advise against using this. It's best suited for when your skin is in a healthy state.

  Tip

  The downside is that it doesn't absorb well and feels quite sticky on the skin.

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• 가나다닌

  Mar 12, 2025 (UTC)
  Oily SkinAcne Skin

  Review under verification

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  OK

  Reviewed by The Hwahae Testers

  This review was written by The Hwahae Testers 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. Reviews by The Hwahae Testers undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.

  OK
  Pros

  1. Brightening I bought this for its brightening function, and with consistent use, I can definitely see my skin becoming clearer. It's not about becoming whiter, but truly achieving a clearer complexion. However, you need to use it consistently for at least 2 weeks. 2. Hydration As someone with very oily skin, I prefer a simple skincare routine. For a functional product, it doesn't cause any dryness, so I usually apply this after toner as a final step. But it's absolutely not recommended for winter use.

  Cons

  1. Tingling sensation Despite many reviews mentioning a tingling feeling, I was hesitant. Even though I don't have sensitive skin, I still felt some irritation. It wasn't to the point of tears, but the sensation was noticeable. 2. Refrigeration While the product itself doesn't mention refrigeration, it's written on the box. People who don't check thoroughly might store it incorrectly. Be careful about this. 3. Stickiness Using this makes my skin so sticky that my hair keeps sticking to my face. If you use it while blow-drying your hair, it might absorb even more into your hair.

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• 우렁찬아이

  Mar 11, 2025 (UTC)
  Dry Skin

  Review under verification

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  OK

  Reviewed by The Hwahae Testers

  This review was written by The Hwahae Testers 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. Reviews by The Hwahae Testers undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.

  OK
  Pros

  Skin type: Very dry, late 20s ✔ Low irritation despite high Vitamin C content With 23% Vitamin C, it's highly concentrated, but unlike some other Vitamin C products, there was hardly any stinging or redness! I was worried because of my sensitive skin, but it absorbed comfortably after application. ✔ Noticeable improvement in skin tone After about a week of use, I felt my overall skin tone had brightened. Existing minor blemishes seemed to fade, and when applied to dull-looking skin, it definitely had an illuminating effect. ✔ Quick absorption and lightweight feel There's no oily sensation, and the hydrating texture absorbs quickly without stickiness! This would suit even those who dislike the typically heavy feel of Vitamin C serums.

  Cons

  1. While the dropper format makes it easy to control the amount, the serum's viscosity can make it a bit messy, leaving residue on hands or around the bottle opening, creating a slightly sticky feeling. 2. Having sensitive skin, I experienced a slight tingling sensation when first using it. Fortunately, my skin adapted after a few uses, but those with a weak skin barrier might want to ensure thorough moisturizing beforehand or start with smaller amounts.

  Tip

  ✔ Start with small amounts to let your skin adapt ✔ Apply in this order: toner → Vitamin C serum → moisturizing cream ✔ Store in the refrigerator and warm slightly in your palms before applying ✔ Use intensively at night & always apply sunscreen if used during the day ✔ Layer an extra amount on blemish marks ✔ Exfoliate before use for better absorption Following these tips should help you use it more effectively without irritation.

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• 감성적인뿔퍼핀59869

  Mar 8, 2025 (UTC)
  수부지Sensitive SkinAcne Skinproduct.Atopy 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.

  OK

  Reviewed by The Hwahae Testers

  This review was written by The Hwahae Testers 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. Reviews by The Hwahae Testers undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.

  OK
  Pros

  After using it for about a week, I noticed my skin becoming brighter and clearer! My skin also felt softer. I used it for two consecutive months and loved it so much that I recommended it to my family members.

  Cons

  When my skin wasn't in the best condition, it felt a bit tingly...! I think it's because the vitamin C content is definitely high. I was worried about skin irritation due to the tingling sensation, but there were no side effects beyond the momentary tingling. It seems that continuous use doesn't necessarily mean continuous improvement! It feels like there's a ceiling to how much it can improve your skin...? I've temporarily stopped using it for now.

  Tip

  I've been using it only at night.

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• 포근한참새류620611

  Feb 26, 2025 (UTC)
  Combination 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.

  OK

  Reviewed by The Hwahae Testers

  This review was written by The Hwahae Testers 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. Reviews by The Hwahae Testers undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.

  OK
  Pros

  With consistent use, you can see your skin becoming clearer and brighter over time

  Cons

  It seems to lack sufficient hydration, and the scent might be a bit overwhelming for some