In this review, I will be discussing the COSRX serum, specifically the Vitamin C Serum, which is a hydrating and brightening facial serum that aims to combat early signs of aging and reduce the appearance of fine lines and dark spots.
I have been using the COSRX serum for two weeks now and I have noticed a significant improvement in my skin’s brightness. The serum has a lightweight formula that is easy to apply and absorbs quickly into the skin. I have sensitive skin, but I did not experience any irritation or breakouts after using it. However, I did notice a strong smell upon first use, but it faded quickly. I also appreciate that the product is animal testing-free and free of parabens, sulfates, and phthalates.
Brighten and Hydrate with Vitamin C

Its ability to brighten and hydrate the skin is one of the key benefits of the COSRX Pure Vitamin C 23% Serum. The lightweight formula is packed with pure Vitamin C, which helps to fight early signs of aging and improve the skin’s overall brightness. In addition to its brightening benefits, the serum also contains hyaluronic acid, which delivers rich moisture deep into the skin and helps to reduce the appearance of fine lines and wrinkles. To get the most out of this serum, it’s important to shake it 1-2 times before use and apply 2-3 drops once or twice daily. For daytime wear, follow up with SPF 30+ sunscreen to protect your skin from harmful UV rays. You can also apply the serum under the eye area, but be sure to avoid direct eye contact. For best results, store the serum in the fridge to prevent oxidation and extend its shelf life.
COSRX serum: Dermatological Ingredients for Youthful Skin

Highly effective dermatological ingredients are formulated in the COSRX Pure Vitamin C 23% Serum to achieve youthful, glowing skin. Pure Vitamin C (Ascorbic acid) is the star ingredient, helping to fight signs of aging and improve the skin’s overall brightness. Super Vitamin E (Tocotrienol) is also included in the formula, which helps to fight signs of aging and slow down skin damage. Finally, hyaluronic acid delivers rich moisture deep into the skin and helps to reduce the appearance of fine lines and wrinkles. If you’re concerned about skin sensitivity, it’s recommended to do a patch test on the body before using the serum on your face. However, the serum is hypoallergenic and has been dermatologist tested, making it a great choice for most skin types. Plus, all COSRX products are formulated with skin-friendly ingredients that alleviate irritated skin. And, the serum is free of parabens, sulfates, and phthalates, as well as animal testing.
COSRX serum: Morning Vitamin C Skincare Routine

Starting your day with brighter, more hydrated skin is a great benefit of incorporating the COSRX Pure Vitamin C 23% Serum into your morning skincare routine. This highly potent formula is a lightweight and hydrating Vitamin C serum that helps to fight early signs of aging. To use, shake the serum 1-2 times before use and apply 2-3 drops once or twice daily. For daytime wear, follow up with SPF 30+ sunscreen to protect your skin from harmful UV rays.To maximize the benefits of the serum, many users like to follow it up with a moisturizer like the Dermalogica By Aluminum, Sea Gel Moisturizer. This moisturizer is thick but still lightweight, making it a great option for those who want to add hydration to their routine without weighing down their skin. Together, these two products can help you achieve brighter, more youthful-looking skin.
COSRX serum: User Reviews

Real results have been seen by users of the COSRX Pure Vitamin C 23% Serum, as evidenced by overwhelmingly positive reviews. Many users have reported that the serum helps to brighten their skin and fade hyperpigmentation, while others have noticed a more youthful glow. Additionally, many users have noted that the serum is easy to use and has a pleasant scent. Some users have reported sensitivity to the serum, so it’s important to do a patch test before using it on your face. However, most users have found that the serum is gentle and effective for most skin types. Plus, the serum is animal testing-free, which is an important consideration for many consumers.
COSRX serum: Long-Lasting and Effective

The COSRX Pure Vitamin C 23% Serum is not only effective, but also long-lasting. Users have reported that a single bottle can last for several months, making it a great value for the price. Additionally, the serum is highly effective at brightening the skin and reducing the appearance of fine lines and wrinkles. While some users have reported sensitivity to the serum, most have found it to be gentle and effective for daily use. And, the serum is free of parabens, sulfates, and phthalates, as well as animal testing. Overall, the COSRX Pure Vitamin C 23% Serum is a great choice for anyone looking to achieve brighter, more youthful-looking skin.
Must-Have for Brighter, More Hydrated Skin

A must-have lightweight and hydrating Vitamin C serum for achieving brighter, more youthful-looking skin is the COSRX Pure Vitamin C 23% Serum, if you’re looking for one. This highly potent formula is packed with pure Vitamin C, which helps to fight early signs of aging and improve the skin’s overall brightness. The serum is also packed with hyaluronic acid, which delivers rich moisture deep into the skin and helps to reduce the appearance of fine lines and wrinkles. To use, shake the serum 1-2 times before use and apply 2-3 drops once or twice daily. For daytime wear, follow up with SPF 30+ sunscreen to protect your skin from harmful UV rays. And, for best results, store the serum in the fridge to prevent oxidation and extend its shelf life. With regular use, you’ll notice brighter, more hydrated skin that looks and feels more youthful.
Pros:
- COSRX Pure Vitamin C 23% Serum is highly potent and helps achieve youthful glowing skin.
- The serum contains dermatological ingredients such as Vitamin C, Vitamin E, and Hyaluronic acid that help fight signs of aging and deliver rich moisture deep into the skin.
- The product is hypoallergenic, dermatologist tested, animal testing-free, parabens-free, sulfates-free, and phthalates-free, making it safe for all skin types.
Cons:
- The initial smell of the serum is not great, but it fades quickly as it soaks into the skin.
- The serum could become a bit sensitive, but the sensitivity goes away the more it is used.
- The product might leak during shipping, and there is no safety seal over the top.
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Conclusion
Overall, I highly recommend the COSRX Vitamin C Serum to anyone looking for a brightening and hydrating facial serum. It is an excellent addition to my morning skincare routine and has made my skin look more youthful and glowing. The only downside is the initial strong smell, but it is a small price to pay for the benefits it provides.
Questions & Answers:
Question: How often should I use COSRX Pure Vitamin C 23% Serum?
Answer: The serum can be used once or twice daily, and it is recommended to shake 1-2 times before use.
Question: Can I apply the serum under my eyes?
Answer: Yes, the serum can be applied under the eye area, but avoid direct eye contact.
Question: Do I need to follow up with SPF 30+ sunscreen after using the serum?
Answer: Yes, it is recommended to follow up with SPF 30+ sunscreen for daytime wear to protect the skin from sun damage.