The Vitamin C 23 Serum

$ 25.00 $ 20.00
  • Details
  • How to Use
  • Ingredients
  • About This Brand

What is it:  Hypoallergenic 23% Pure Vitamin C Brightening Booster. A high-performance, anti-aging solution designed to prevent early signs of aging while infusing your skin with the power of pure vitamin C.


Why we love it:

- Fade acne scars and hyperpigmentation

- Brightens dull skin

- Firms and plumps

- Diminishes fine lines and wrinkles


Clinical Results in 4 Weeks : 

- 16.26% improvement of pigmentation (visible melasma and blemishes)

- 32.89% improvement of triple-complexion skin tone (red skin tone)

- 32.36% effect of brightening (skin radiance)

- 16.36% improvement of elasticity (internal elasticity)

- 38.65% improvement of the pore (volume)

- 27.18% improvement of the pore (count)

- 4.18% improvement of skin age


*Based on clinical trials of 20 subjects. 

*Dermacosmetic Skin Science Laboratory Co., Ltd.


Please Read: 

- For the first use, attach the enclosed dropper in the product package.

- Recommended to use within 2 months of opening due to active ingredient protection.

- Gas can be generated due to the nature of Vitamin C.

- With a specially designed cap to seal, it can be safely stored by controlling the gas generated inside the container.



*Please use immediately after purchase and store upright in refrigerator once opened.


20ml / 0.67 fl. oz

After cleansing, during the serum phase, shake the bottle lightly once or twice from side to side and apply a few drops to the skin. Use fingertips to gently massage and absorb the serum, starting from the inside of the face working towards the edges.

Water, Ascorbic Acid(23%), Propanediol, Dimethicone, Tromethamine, Panthenol, Ethyl Ascorbyl Ether, Squalane, Caffeine, Sodium Chloride, Sodium Hyaluronate, Sodium Sulfite, Disodium EDTA, Glutathione, Adenosine, Acetyl Glucosamine, Gardenia Florida Fruit Extract, Allantoin, Dextrin, Tocotrienols, Tocopherol, Elaeis Guineensis (Palm) Oil, Butylene Glycol, Arginine, Niacinamide, Pentylene Glycol, Alcohol Denat., Helianthus Annuus (Sunflower) Seed Oil, Glycyrrhiza Glabra (Licorice) Root Extract, Methyl Trimethicone, Carthamus Tinctorius (Safflower) Seed Oil, Camellia Japonica Seed Oil, Daucus Carota Sativa (Carrot) Root Extract, Beta-Carotene.

One of the most beloved K-beauty brands. Cosrx is known for its precise formulations and consistent performance thanks to a series of high-performing ingredients that drive results.

Customer Reviews

Based on 39 reviews
Skin Type: Combination
Age: 35-44
Great product

I really like this product. It's very "liquid-y" so you have to be careful if you're applying it directly on your face instead of your hands first, but when I put this on at night, my skin still says so soft and moist in the morning. Really makes a difference.


My skin care routine usually very simple and without serum. This COSRX serum C-23 is the first serum (vitamin c) that I ever try and my first impression is good.
Not yet see any brightening effect but we'll see.


Love this light weight texture and non sticky finish !
Def going to be my next holy grail .
I'v tried several vitamin serums and this one is my best cos it doesn't irritate my skin and turn my skin red.
Highly recommend for who has sensitive skin like me !
Thank you COSRX !!!!


This product actually works! I've tried so many products to lighten my dark spots on my face. I have used it every night and it made my skin smoother and brighter. I will never be without this.I really satisfied with the serum. Also I really want to try retinol and vitamin E serum too!


I have acne scars and dark spots due to sun exposure. I have been using this to my night care and it makes my skin brighter and smoother :) When I wake up in the morning, my skin tone is much more even.
Just for the record, every night after cleansing, I use Propolis synergy toner (this is one of my favorites) and then use this vitamin C serum, then apply moisturizer with light texture.
If you're looking for good skincare that does work pretty well, I definitely recommend this!