Price: $20.50 - ($25.55 / fluid ounce)
(as of Sep 10, 2025 21:44:53 UTC – Details)

Product description

1 Results

2 Benefits

3 Key Ingredients

4 Active Ingredients

5 How To Use

The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked.

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Maximize Benefits with this Routine

1st Step- Facial Serum (Day)

Apply Serum after cleansing and toning, then follow up with sunscreen

2nd Step- Facial Essence

Follow up with the Snail Essence to maximize benefits and moisturize the skin

3rd Step- Sunscreen

Finish off with the lightweight Vitamin E Sunscreen SPF 50+

Benefits

Reduce redness, visible melasma, and blemishes while providing radiance

Benefits

Repair damaged skin, provide long-lasting hydration, and improve skin’s vitality

Benefits

Protect the skin from UVA and UVB rays and repair visible signs of aging

Our Brand Story

COSRX believes that cosmetics should give more than just outward beauty. We are devoted to enabling individuals to find solutions according to their personal skin conditions. We strive to help our customers gain self-confidence, and ultimately find their own unique beauty inside.

Featured in

COSRX has been featured in multiple prominent magazines and our products have received praise from many trusted editors. As proven by the countless articles that have been released, COSRX will continue to listen to the voices of our customers and strive to improve.

How do I use this product?

This Serum consists of highly concentrated Pure Vitamin C (Ascorbic Acid)- a patch test on the body is recommended before using on the face. Store in the fridge to prevent oxidation.

Why does the serum smell bad?

Pure Vitamin C (Ascorbic Acid) naturally has a coppery scent. In order to keep our product as natural as possible, The Vitamin C 23 Serum is formulated without artificial fragrances.

Can this be used on sensitive skin?

Based on a Primary Dermal Irritation Study (on 30 subjects for 24 hours) the “COSRX The Vitamin C23 Serum” is found to be a non-irritant product that causes no irritation for sensitive skin. *Perform a patch test on the body before using on the face.

How do I know if this product is authentic?​

To ensure the authenticity of the product, please make sure you are purchasing the product from COSRX Inc. ​The authenticity of the product cannot be promised when purchased from sellers other than COSRX Inc.

Product Dimensions ‏ : ‎ 1.73 x 2.56 x 4.09 inches; 0.71 ounces
Item model number ‏ : ‎ SC40TR03
Manufacturer ‏ : ‎ Cosrx
ASIN ‏ : ‎ B09ZY8T55Y
Best Sellers Rank: #3,841 in Beauty & Personal Care (See Top 100 in Beauty & Personal Care) #95 in Facial Serums
Customer Reviews: 4.1 4.1 out of 5 stars 6,540 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
A lightweight Vitamin C Booster Serum. Fight early signs of aging and improve the skin’s radiance with the lightweight and hydrating Vitamin C serum.
Patch Test Recommended: This serum consists of highly concentrated pure Vitamin C. A patch test on the body is recommended before using it on the face.
Dermatological Ingredients: Pure Vitamin C (Ascorbic acid) helps achieve youthful glowing skin. Super Vitamin E (Tocotrienol) helps fight signs of aging and slows down skin damage. Hyaluronic acid delivers rich moisture deep into the skin and helps reduce the appearance of fine lines and wrinkles.
How to Use: Shake 1-2 times before use and apply 2-3 drops once or twice daily. For daytime wear, follow up with SPF 30+ sunscreen. Can be applied under the eye area; avoid direct eye contact. ✅ Store in the fridge to prevent oxidation.
Patch Test Recommended: Perform a patch test on the body before using on the face. Proceed to using on the face if no irritation occurs in 24 hours. Consult with your doctor immediately if irritation occurs.