Is the 13% serum suitable for a vitamin C beginner and everyday use?

Yes. COSRX identifies it as the beginner-friendly option for mild daily brightening and hydration, while the Vitamin C 23 Serum is intended for more experienced users seeking intensive care.

Where does this serum go in my routine, and how much should I apply?

Use it after cleansing and toner. Apply a few drops or a small amount evenly, avoiding the eye area, then gently massage until absorbed.

Can I apply it during the day?

Yes. When you use it during the day, follow with sunscreen.

How should I store the serum after opening?

Keep it away from high temperatures and direct sunlight. Refrigeration is recommended if you do not use it daily and can help maintain freshness. Use the serum within two months of opening.

Is the serum supposed to have a yellow tint?

Yes. The serum has a slight yellow tint from its pure vitamin C content.

Does the serum contain added fragrance or have a noticeable smell?

No fragrance is added. You may still notice a characteristic odor from the formula's raw materials.

How is The Vitamin C 13 Serum different from COSRX's Vitamin C 23 Serum?

The 13% serum is lighter, more refreshing and designed as a mild daily option for beginners. The 23% serum is positioned for experienced vitamin C users seeking more intensive brightening care.

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COSRX

The Vitamin C 13 Serum

What it is: A watery, quick-absorbing facial serum that helps improve the look of discoloration and uneven tone while supporting moisture.

13% pure vitamin C
Watery, non-sticky finish
Beginner-friendly daily care
Hydrating, comforting support

Net weight: 20 ml / 0.67 fl oz

The Vitamin C 13 Serum

20ml ·$13.99 USD

13% pure vitamin C

Watery, non-sticky finish

Beginner-friendly daily care

Hydrating, comforting support

Main active: Vitamin C
Intensity: Gentle

PRODUCT DETAILS

Hello, brighter days. This water-based serum pairs 13% pure vitamin C with daily brightening care for the appearance of discoloration and uneven tone. It is a thoughtful place to begin if you are new to vitamin C or simply prefer a milder option for regular use.

The texture keeps things light. It is watery, quick-absorbing and non-sticky, with a more refreshing feel than COSRX's Vitamin C 23 Serum. A slight yellow tint is natural for this formula and comes from its pure vitamin C content. No fragrance is added, though you may notice the characteristic scent of the raw materials.

Sodium hyaluronate and allantoin bring moisture and comfort to the formula, balancing its brightening focus with a little softness. Together, they make this brightening serum with hydrating support a comfortable match for routines focused on dullness, uneven tone, dark spots or early visible signs of aging.

Compared with the Vitamin C 23 Serum, this version is the gentler first step: lighter, more refreshing and intended for beginners. Choose it when you want an approachable everyday vitamin C serum rather than COSRX's more intensive option.

Learn more

GOES WELL WITH

2X TGG Care Hyaluronic HydroMask$19.99 USD

5 PDRN Hyaluronic Acid Vital Hydrating Hydrogel Mask$12.99 USD

1025 Dokdo Eye Cream$22.99 USD

5 PDRN B5 Vital Soothing Toner$15.99 USD

AC Fighting AHA BHA PHA Toner$9.99 USD

100 Reedle Shot Stick Pouch$8.09 USD

1025 Dokdo Cleanser$11.99 USD

1025 Dokdo Cream$24.99 USD

A gentle daily vitamin C serum for brighter, more even-looking skin, fresh hydration and a lightweight finish.

Brighter, more even-looking tone
Fresh hydration
An easy first vitamin C

Key Ingredients

Seven dry amber, apricot, lavender and celadon relief rays spread diagonally across one warm-ivory matte plaster surface beside a tiny coral point.

Vitamin C

An antioxidant ingredient family that can help brighten uneven-looking tone and soften visible dullness.

Clear hydrogel spheres and droplets on a pale lilac background.

Hyaluronic Acid

Helps hydrate and visibly plump the skin.

Three oversized translucent, softly faceted glass crystals arranged on a pale lavender stage above a blush background with a small coral accent.

Allantoin

Helps soothe and soften dry, rough-feeling skin.

Real Results

16.1%Improvement in the appearance of pigmentation after 4 weeks¹
12.2%Improvement in the appearance of pigmented area after 4 weeks¹
113.8%Improvement in surface moisture after 4 weeks¹
20.2%Improvement in skin texture or roughness after 4 weeks¹

View all 14 real results

Woman holding the dropper bottle beside a short list of product benefits.

Concerns & Benefits

Your Concerns

1
Uneven Skin Tone
Your complexion looks uneven, and you want focused care for the appearance of discoloration.
2
Dehydration
Your skin needs moisture, but you would rather avoid a sticky serum finish.

How To Use

1After cleansing and toner, apply a few drops or a small amount evenly to your face, avoiding the eye area.
2Gently massage from the center of your face outward until the serum is absorbed.
3When applying the serum during the day, follow with sunscreen.

Glass dropper releasing pale serum beside vitamin C, vitamin E, and hyaluronic acid callouts.

Frequently asked questions

What does the serum feel like, and does it leave a sticky finish?

It has a lightweight, watery texture that absorbs quickly and leaves a non-sticky finish.

Customer reviews

Frequently Bought Together

Buy these products together

This itemThe Vitamin C 13 Serum$13.99 USD

2X TGG Care Hyaluronic HydroMask$19.99 USD

5 PDRN Hyaluronic Acid Vital Hydrating Hydrogel Mask$12.99 USD

Total price: $46.97 USD

This itemThe Vitamin C 13 Serum$13.99 USD

2X TGG Care Hyaluronic HydroMask$19.99 USD

5 PDRN Hyaluronic Acid Vital Hydrating Hydrogel Mask$12.99 USD

Total price: $46.97 USD

PO:DL

2X TGG Care Hyaluronic HydroMask

Cooling, close-fitting hydrogel care for thirsty-looking skin and a supple, luminous finish.

42 g each × 4 masks$19.99 USD

COSRX

5 PDRN Hyaluronic Acid Vital Hydrating Hydrogel Mask

Close-fitting hydrogel care for deep hydration, a radiant look and firmer-looking skin.

3 masks, 34 g (1.19 oz.) each$12.99 USD

ROUND LAB

1025 Dokdo Eye Cream

Lightweight daily eye care for hydration, brightness and smoother-looking fine lines.

30 ml / 1.01 fl oz$22.99 USD

COSRX

5 PDRN B5 Vital Soothing Toner

Lightweight daily hydration for dry, sensitive or dull-looking skin

280 mL$15.99 USD

TIAM

AC Fighting AHA BHA PHA Toner

Triple-acid exfoliation with moisture support for a clearer, more even-looking tone.

180 ml$9.99 USD

VT COSMETICS

100 Reedle Shot Stick Pouch

A travel-size evening booster for smoother-feeling, more refined-looking skin.

2 mL × 10$8.09 USD

ROUND LAB

1025 Dokdo Cleanser

Creamy, slightly acidic foam for a comfortable cleanse

150 ml$11.99 USD

ROUND LAB

1025 Dokdo Cream

A rich, unscented balm moisturizer for lasting hydration and a soft, cushioned feel.

80 ml$24.99 USD

COSRX The Vitamin C 13 Serum for Daily Brightening

COSRX

The Vitamin C 13 Serum

What it is: A watery, quick-absorbing facial serum that helps improve the look of discoloration and uneven tone while supporting moisture.

13% pure vitamin C
Watery, non-sticky finish
Beginner-friendly daily care
Hydrating, comforting support

Net weight: 20 ml / 0.67 fl oz

The Vitamin C 13 Serum

20ml ·$13.99 USD

13% pure vitamin C

Watery, non-sticky finish

Beginner-friendly daily care

Hydrating, comforting support

Main active: Vitamin C
Intensity: Gentle

PRODUCT DETAILS

Learn more

GOES WELL WITH

2X TGG Care Hyaluronic HydroMask$19.99 USD

5 PDRN Hyaluronic Acid Vital Hydrating Hydrogel Mask$12.99 USD

1025 Dokdo Eye Cream$22.99 USD

5 PDRN B5 Vital Soothing Toner$15.99 USD

AC Fighting AHA BHA PHA Toner$9.99 USD

100 Reedle Shot Stick Pouch$8.09 USD

1025 Dokdo Cleanser$11.99 USD

1025 Dokdo Cream$24.99 USD

A gentle daily vitamin C serum for brighter, more even-looking skin, fresh hydration and a lightweight finish.

Brighter, more even-looking tone
Fresh hydration
An easy first vitamin C

Key Ingredients

Real Results

16.1%Improvement in the appearance of pigmentation after 4 weeks¹
12.2%Improvement in the appearance of pigmented area after 4 weeks¹
113.8%Improvement in surface moisture after 4 weeks¹
20.2%Improvement in skin texture or roughness after 4 weeks¹

View all 14 real results

Concerns & Benefits

Your Concerns

1
Uneven Skin Tone
Your complexion looks uneven, and you want focused care for the appearance of discoloration.
2
Dehydration
Your skin needs moisture, but you would rather avoid a sticky serum finish.

How To Use

1After cleansing and toner, apply a few drops or a small amount evenly to your face, avoiding the eye area.
2Gently massage from the center of your face outward until the serum is absorbed.
3When applying the serum during the day, follow with sunscreen.

Frequently asked questions

What does the serum feel like, and does it leave a sticky finish?

It has a lightweight, watery texture that absorbs quickly and leaves a non-sticky finish.

Customer reviews

Frequently Bought Together

Buy these products together

This itemThe Vitamin C 13 Serum$13.99 USD

2X TGG Care Hyaluronic HydroMask$19.99 USD

5 PDRN Hyaluronic Acid Vital Hydrating Hydrogel Mask$12.99 USD

Total price: $46.97 USD

This itemThe Vitamin C 13 Serum$13.99 USD

2X TGG Care Hyaluronic HydroMask$19.99 USD

5 PDRN Hyaluronic Acid Vital Hydrating Hydrogel Mask$12.99 USD

Total price: $46.97 USD

PO:DL

2X TGG Care Hyaluronic HydroMask

Cooling, close-fitting hydrogel care for thirsty-looking skin and a supple, luminous finish.

42 g each × 4 masks$19.99 USD

COSRX

5 PDRN Hyaluronic Acid Vital Hydrating Hydrogel Mask

Close-fitting hydrogel care for deep hydration, a radiant look and firmer-looking skin.

3 masks, 34 g (1.19 oz.) each$12.99 USD

ROUND LAB

1025 Dokdo Eye Cream

Lightweight daily eye care for hydration, brightness and smoother-looking fine lines.

30 ml / 1.01 fl oz$22.99 USD

COSRX

5 PDRN B5 Vital Soothing Toner

Lightweight daily hydration for dry, sensitive or dull-looking skin

280 mL$15.99 USD

TIAM

AC Fighting AHA BHA PHA Toner

Triple-acid exfoliation with moisture support for a clearer, more even-looking tone.

180 ml$9.99 USD

VT COSMETICS

100 Reedle Shot Stick Pouch

A travel-size evening booster for smoother-feeling, more refined-looking skin.

2 mL × 10$8.09 USD

ROUND LAB

1025 Dokdo Cleanser

Creamy, slightly acidic foam for a comfortable cleanse

150 ml$11.99 USD

ROUND LAB

1025 Dokdo Cream

A rich, unscented balm moisturizer for lasting hydration and a soft, cushioned feel.

80 ml$24.99 USD