Real Fit Vitamin C Serum C-23

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USD 29.00
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COSRX's Real Fit line
Meticulously formulated with 23% pure vitamin C and propolis to boost radiance and leave skin plump and youthful.

What it is: Maximizes the pros whilst minimizing the cons of incorporating vitamins into your skincare! To optimize the benefits, pure vitamins or derivatives are carefully selected to amplify the effects and enhance the delivery of active ingredients into the skin. Synergistic components are also added to minimize the side effects associated with using highly concentrated vitamins.


  • The powerful effect of pure vitamin C
    23% of pure vitamin C (purity 99%) works as a powerful antioxidant to visibly brighten and even skin tone, reduce the appearance of dark spots and wrinkles.
    Leaves the skin looking radiant and healthy with a youthful glow.
  • Cutting edge formula for an enhanced effect
    COSRX's patented technology utilizing Aronia melanocarpa fruit extract and Hippophae rhamnoides extract increases the stability and efficacy of vitamin C.
  • Moisturizing ingredient to supplement the shortcoming of Vitamin C

    60% propolis extract is added instead of purified water to combat the dryness caused by vitamin C. Propolis extract moisturizes and nourishes the skin protecting it from dehydration and stimulation.


  1. Use SPF protection during the day.
  2. Do not use together with other acids like AHAs, BHAs, and retinol.
  3. Mild irritation or redness may occur for first time users. If so, use every other night until skin adjusts.
  4. Contents may turn brown due to oxidation. To avoid this, store in a cool, dark space between 15ºC ~ 25ºC, as far away from light and heat as possible.
  5. Use within 2 months of opening.


Propolis Extract, Ascorbic Acid, Aronia Melanocarpa Fruit Extract, Hippophae Rhamnoides Extract, Butylene Glycol, 1,2-Hexanediol, Sodium Lactate, Water, Cassia Obtusifolia Seed Extract, Sodium Hyaluronate, Allantoin

How to use:

  1. After opening, replace cap with provided dropper.
  2. Apply two to three drops onto clean skin, avoiding eyes.

Customer Reviews

Based on 38 reviews
Vince Uy

I bought this during the early bird and got the 4 bottle pack. Delivery took more than a month, also, I had to pick it up from the post office. And when I opened the package, there were leaks on the bottles. And when I opened the bottles, it looked like they already oxidized. What a waste.


As much as I hate to say it, this Vitamin C serum is not for me. It BURNS my face and completely stripped my moisture barrier. I tried to mix it in with the moisturizer and it still made my face sting.

Mu'aamalaah Zain

Packaging :
The bottle is good, dark color to prevent the product from oxidizing.The size is 20 ml and the PAO is 2 months. I think the size of the bottle is just right for 2 months pao. neither too much nor less.
The pipette is made of glass and is just the right size to reach the bottom of the bottle

Texture :
The texture is light weight, watery, and not sticky. It's absorb really quickly. Only need 2-3 drops for the whole face.

#HonestReview :
I've tried several vitamin C products and I think this Cosrx vitamin serum the fastest gives a great effect on my skin. the product is also not easy to oxidize like the vitamin serum that I used before.

Totally I'm in love with this product. I tried for a month and i'm so happy my skin is getting better.

This serum this serum rich in anti-oxidants like Ascorbic Acid and Aronia Melanocarpa Fruit Extract . As y'all knew that Ascorbic acid is a powerful antioxidant to neutralize free radicals also help brightening the skin. The dark spot on my forehead had faded and my skin was brighter than before. This serum also reduced the redness on my cheeks

It also moisturizes my skin because this serum contains sodium hyaluronate. My skin be glowing in the morning


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.

I wish this was something that I could use daily.

I bought this serum during the early bird event. The product is clear, watery and smells a lil chemically. On application the serum stings. I think it is very potent and needs to be mixed with moisturizers.