Real Fit Vitamin C Serum C-23

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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.

How to use:

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

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

Customer Reviews

Based on 42 reviews
Jennifer Santiago
Love this

I received this vitamin when it was just release. It is an amazing serum and brighten your skin gradually, which I love that way.


I actually really like it. Got them when they were just released. It's probably the best vitamin c serum that I've tried

Nikki Kumar
Not worth it

I purchased this in a pack of 5 when it was first released since there was a promotion offer. Unfortunately I didn’t have the best experience with this vitamin C serum and I have tried multiple Korean formulations from other brands. This was WAY too strong for my skin, and my skin is used to higher vitamin C serums, and it oxidized way too quickly. The bottle says it will last two months but upon opening I noticed the color get dark the next day which means it’s not as effective. There are better and more stable vitamin C serums out there on the market that won’t damage your skin barrier like this one.

Miss the triple C

I also ordered this during the early bird and it unfortunately was oxidized. Had to throw most of them out except 1, but that too oxidized very quickly. I only was able to use the one I had for a month, and it’s not like the triple C . I was really disappointed. Wish they could go back to the original formula because it was very effective at lightening up my hyperpigmentation.

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.