Product Info

Why We Love It

It presents a new paradigm of record-breaking sales progress in the vitamin C serum category.
It provides a feeling of clear and uniform skin tone, improved skin blemishes and blemishes, and a satisfying feeling of firm skin, with a 100% satisfaction rate.
In one month, it provides an age reduction of 2 years in the skin proven with 7 human efficacy tests.
Featured Ingredients

It provides 50 times more powerful antioxidant care than vitamin E with tocotrienols and moisturizing effects with sodium hyaluronate.
It provides a soothing effect with allantoin.
It uses 23% of pure vitamin C which is more powerful than vitamin derivatives.
How to Use

After cleansing, drop a moderate amount onto the face at the serum stage, and absorb it by gently rolling it from the inside to the outside of the face with your fingertips.
1. Shake it lightly from side to side 1~2 times after securely attaching the included pipette. (If shaken before opening, overflowing may occur.)
2. Apply on both cheekbones.
3. Roll along the skin's texture from the cheeks to forehead to the chin (neck) using a rolling motion to apply.
4. Take care of skin elasticity by adding C-curl lift motion, focusing on the C-zone.
5. Spread the skincare product from the inside to the outside of the face.
* If you use this product during the day, make sure to apply sunscreen.

Why we love it

Vitamin C 23 Serum

Proven by 7 clinical tests*
to make your skin look 2 years younger in 1 month*

7 Benefits
in a single drop

Brightening booster to revive dull skin

Antioxidation

Glow / Brightening
IMPROVED Elasticity UP

Hyper-
pigmentation
IMPROVED Wrinkles-
DOWN
(around the eye)

3 Types of Skin Tone
IMPROVED Pores
DOWN

Key ingredients

Optimal synergy of
carefully selected ingredients
for intense hydration

Tocotrienol
(Super Vitamin E)

50x more effective
than vitamin E

*antioxidant care

Sodium Hyaluronate

Hydrating

Allantoin)

Soothing

Meeting both requirements
Brightening booster

Is it pure vitamin C?

Has it been antioxidant tested (in-vitro)?

Don't think all vitamin serums are the same!
The Foolproof Care Secrets of COSRX Vitamins

Featured ingredients

Formulated with 23% pure vitamin C,
stronger than vitamin derivatives

Vitamin C derivatives

Pure Vitamin C
(COSRX Serum)

Ethyl Ascorbyl Ether
Ascorbyl Glucoside
Sodium Ascorbyl Phosphate

Ascorbic Acid

Low

Smaller particles
for better absorption
of active ingredients

Resistant to light and heat

Optimized blend of
pure vitamin C
which is difficult to stabilize
because of its sensitivity
to light, heat, and oxygen

The secret to the stabilized formula
The specially designed container

We have packed the dropper separately
for hygienic storage and to keep it fresh.

To preserve the freshness and delay the oxidation of pure vitamin C,
which is sensitive to external stimuli such as light, heat, and oxygen,
a special container that allows internal gases to escape
while preventing the ingress of external air is used.

Up to 120 h of antioxidant power*
to fight skin aging

Pure vitamin C products are susceptible to light and heat,
and constant contact with air, including opening
and closing, can make them more unstable and less effective,
but our vitamin C serum is stabilized and can be kept at room temperature
for 120 h without losing its antioxidant power!

*Period: Nov. 1 – 10, 2022 / Dermacosmetic Skin Science Laboratory
*In vitro test for the antioxidant effects of COSRX The Vitamin C 23 Serum

Dark spots, blemishes and freckles reduced
in just 4 weeks!

*Period: Aug. 10 – Sep. 7, 2022 / Dermacosmetic Skin Science Laboratory
*Subjects: 20 people aged 30–65 *Photos with the top 5 improvement
*Results may vary by individual.

Reddish/yellowish/dull skin tones
improved in just 4 weeks!

*Period: Aug. 10 – Sep. 7, 2022 / Dermacosmetic Skin Science Laboratory
*Subject: 20 women aged 30–65 *Photos with the top 5 improvement rates
*Results may vary by individual.

Skin glow and elasticity
improved in just 7 days!

Crow's feet
reduced in just 4 weeks!

*Period: Aug. 10 – Sep. 7, 2022 / Dermacosmetic Skin Science Laboratory
*Subject: 20 women aged 30–65 *Photos with the top 5 improvement rates
*Results may vary by individual.

Enlarged pores improved in 4 aspects
just in 7 days!

*Period: Aug. 10 – Sep. 7, 2022 / Dermacosmetic Skin Science Laboratory
*Subject: 20 women aged 30–65 *Photos with the top 5 improvement rates
*Results may vary by individual.

Debunking the myth
that high content vitamin C is irritating!
Two types of skin irritation tests
have been completed!

Hydrating and firming texture

The oil and water layers are blended and gently penetrate the skin,
leaving it plumper and more radiant.

How to use

#HighPerformanceVitaSerum
Use it in this order.

After cleansing, apply an appropriate amount to the face
and massage around with fingertips
from the center of the face outwards.

Engage the provided dropper and gently shake from side to side
(do not shake before opening).
Apply to the cheekbone area of both cheeks.
Apply in a rolling motion from cheek to forehead to chin (neck),
following the texture of the skin.
Apply to the C-zone, where elasticity is an issue,
in a C-curl lifting motion to boost skin elasticity.
Apply your next skincare product from the center of the face outwards.

*If you use this product during the day, make sure you use sunscreen.

Precautions for storage
and handling of high amounts of vitamin C

*As we do not use fragrances that can cause irritation,
you may notice a strong odor that is inherent to the ingredients,
but this is not a sign of anything wrong with the product,
and you can use it with confidence.

*Use immediately after purchase
and refrigerate (3–10°C) upright.

Because of the nature of vitamin C, gas may be produced.
There may be a 'pop' sound when opening.
The specially designed cap controls the amount of
gas generated inside the bottle when the vitamin C is sealed,
ensuring safe storage.
Shaking the bottle before opening may cause overflow,
so shake the bottle gently from side to side after engaging the dropper.
The empty space in the bottle is reserved for safe use.
Vitamin C products are prone to discoloration due to oxidation
and should be used within two months of opening.
Store away from high temperatures and direct sunlight.
Store in the fridge before and after opening.

COSRX The Vitamin C 23 Serum 20g Double Set