COSRX The Vitamin C 23 Serum 20ml
Curated in Seoul — trusted skincare straight from Korea’s beauty capital.
Official Korean distributors — 100% verified and authentic products only.
Authenticity guaranteed — full refund if not satisfied.
$ 40 USD
Achieve a radiant, even-toned complexion while enjoying the nourishing effects of this lightweight formula—perfect for anyone seeking youthful, glowing skin!
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Don’t Assume All Vitamin Serums Are the Same!
Experience the difference with COSRX’s powerful Vitamin C 23 Serum—your all-in-one solution for glowing, even-toned, and youthful skin.
🌟 7 Benefits in Just One Drop
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Antioxidant Protection
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Improved Skin Elasticity
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Minimized Pores
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Dark Spot & Pigmentation Care
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Wrinkle Reduction (especially around the eyes)
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Triple Complexion Enhancement
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Radiant & Brightened Skin Tone
🔬 Key Ingredients
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23% Pure Vitamin C – A highly concentrated dose for maximum brightening and anti-aging results.
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Super Vitamin E – Enhances antioxidant protection and improves skin resilience.
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Hyaluronic Acid – Delivers hydration and prevents dryness or irritation.
Clinically Proven: In vitro tests show that COSRX The Vitamin C 23 Serum retains potency even after 120 hours. At 0.01% treatment concentration, it inhibited free radical production by 83.6%.
💬 Real Testimonials
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“Visible brightening results you can actually see!”
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“100% satisfaction with skin transformation over 4 weeks.”
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“My dull skin tone looks clearer and more even.”
📊 Clinical Study Results
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Pigmentation Reduction: -16.2%
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Skin Tone Improvement:
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Yellow tones: -32.8%
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Redness: +3.9%
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Wrinkle Reduction (Eye Area): -11.4%
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Pore Size Reduction:
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Volume: -38%
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Depth: -36%
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🙋♀️ Recommended For:
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Those looking for a high-potency vitamin serum
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Anyone concerned with dark spots, wrinkles, or uneven skin tone
✅ How to Use
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After cleansing, apply a small amount during the serum step.
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Gently massage into your skin, working from the center outward.
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Use sunscreen during the day to protect your skin and enhance results.
🌍 Eco-Friendly Disposal Guide
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Dropper Head: General waste
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Dropper Cap & Glass Tube: Glass recycling
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Label: Vinyl recycling
🧊 Storage Tips
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Store refrigerated (3–10°C) immediately after purchase.
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Use within 2 months after opening to prevent oxidation.
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Keep away from direct sunlight and heat.
Patch Test Recommended: Individual results may vary. Always test on a small area before full application.
Let your skin rediscover its glow—brighten, hydrate, and protect with The Vitamin C 23 Serum by COSRX.

14 reviews for COSRX The Vitamin C 23 Serum 20ml
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Seraphina from Madrid, España –
Al principio era escéptica acerca de la eficacia del suero COSRX The Vitamin C 23, pensando que todos los productos con vitamina C prometen resultados similares. Sin embargo, decidí probarlo debido a sus ingredientes destacados. Después de solo unas semanas de uso en Madrid, mi piel mostró una notable mejoría; las manchas oscuras comenzaron a desvanecerse y el tono se volvió más uniforme y radiante. Me encantó cómo sentí mi rostro revitalizado tras aplicar este potente concentrado — además tiene un aroma fresco increíblemente agradable que lo hace aún mejor para iniciar el día. Definitivamente vale cada centavo por ese brillo natural duradero.
Seraphina Trent from New York, USA –
As someone immersed in the vibrant skincare culture of New York City, I found COSRX The Vitamin C 23 Serum a remarkable gem amid an avalanche of products. The texture feels effortlessly lightweight yet impressively potent upon application—truly redefining my morning ritual! Over time, dark spots that have quietly occupied real estate on my face seemed to shrink away as if lost among subway commuters at rush hour. Each drop encapsulates pure hope with its incredible blend: high-dose vitamin C packs undeniable power against aging signs while hyaluronic acid brings necessary hydration through blistering summers and relentless winters alike. It transforms mundane routines into moments for indulgence and leaves skin feeling bright enough to reflect all those dazzling city lights. Bravo!
Haruki from Tokyo, Japan –
みんな、COSRXのビタミンCセラムを使った?ほんとにすごいよ!最初は懐疑的だったけど、今じゃ手放せない。これのおかげで肌が明るくなって、乾燥とは無縁になれた。特に気になる小さなシワも軽減された感じするし、小鼻の毛穴にも効いているっぽい!さらに若返った感覚まで味わえるなんて夢みたいだね。本当に試してみる価値アリ✨
Anastasija from Zagrzeb, Chorwacja (verified owner) –
Korzyści z witaminy C, które miałem w COSRX Vitamin C 23 Serum były spektakularne. Moja skóra wygląda bardziej promiennie i jędrniej niż kiedykolwiek! Idealny wybór na ujędrnianie bez uczucia ciężkości.
Layla from Dubai, UAE –
لنكن صادقين، لم أكن أتوقع الكثير من سيروم فيتامين C هذا. هناك العديد من المنتجات المماثلة الموجودة بالسوق وكلها تدعي نفس الفوائد العجيبة! ومع ذلك، بدأت بإستخدام سيروم COSRX Vitamin C 23 وصدقوني يا رفاق – كانت النتائج فورية وبعيدة الأثر. فقط بعد أيام قليلة لاحظت كيف بدأ لون بشرتي بالتوحّد وتحسن توهج وجهي بشكل ملحوظ مما كان رائعًا لرؤيته بعيداً عن شاشة المرآة اليومية.
قررت استثمار لحظة لنفسي ، ولذلك سأستمر بتطبيق السيروم وأدع الجمال البراق يبتكر ظاهرة تفرد ولياعتي كما يأمل طموح عقلي النقي والعقلاني بعصر جديد للبشرة!
Catalina Torres from Madrid, España –
Probé el suero de vitamina C y mi piel lució iluminada como nunca. Los problemas con las manchas oscuras han disminuido considerablemente, realmente es efectivo para mantener un tono uniforme.
Giorgos from Rome, Italy (verified owner) –
Entro la luminosità dei vicoli di Roma, ho scoperto il siero COSRX The Vitamin C 23 che ha rivoluzionato completamente la mia routine quotidiana. Dopo solo alcune settimane, i cambiamenti sulla mia pelle sono innegabili: macchie scure svaniscono e un’uniformità luminosa riemerge nel mio viso. L’intenso potere antiossidante della vitamina C pure trasmette freschezza anche alle mie serate più frenetiche! Per non parlare del miglioramento nell’elasticità; quella sensazione soda è difficile da trovare altrove. Se siete come me ed abitate una città affollata e piena di smog come questa eterna bellezza italiana, vale decisamente provare questo prodotto – soprattutto prima dell’estate quando cerco quel bagliore radioso mentre cammino verso Campo de’ Fiori.
Gabriela Silva from Toronto, Canada –
Transformational in essence—this serum unveils skin luminosity through scientifically adept methods. A touch evokes enchantment; marks fade, and resilience thrives at every pore.
Olivia Jensen from Portland, USA –
At first glance, I thought the hype surrounding COSRX’s Vitamin C 23 Serum was just another skincare marketing ploy. However, after trying it for several weeks in rainy Portland—a city known for its gloomy weather—I found myself surprised. Each application delivered an impressive surge of freshness to my face and that natural glow I often craved! Gradually dark spots diminished; my complexion felt remarkably more vibrant than during those long winter months when skin feels as tired as a midweek coffee run could cure. Yes, there’s been minor improvements around delicate areas like eyes too—less creasing worry before big meetings! Color me impressed.
Amelia Harrington from Toronto, Canada –
I approached COSRX’s Vitamin C 23 Serum with a hint of skepticism; I’ve seen so many glowing claims that turned out to be just clever marketing. However, after incorporating this serum into my routine for about two weeks in the bustling heart of Toronto, I genuinely began to see a difference! My complexion looks noticeably brighter and more even-toned. The texture feels light yet somehow nourishing, giving my skin an astonishing bounce—like it’s taken on new life. Dark spots seem lighter too! Sure, it took some commitment but experiencing such evident improvements is hard to argue against now.
Lucas Mendes from Rio de Janeiro, Brasil –
Minha pele realmente mudou desde que comecei a usar o Sérum de Vitamina C 23 da COSRX. Manchas escuras diminuíram e notei um brilho incrível! Maravilhoso!
Niamh from Dublin, Ireland –
So, I’ve been trying out the COSRX Vitamin C 23 Serum for a few weeks now, and honestly? It’s a game changer! First off, that 23% pure vitamin C is no joke—my skin feels brighter already. I mean, I’m all about those glowing vibes. Plus, the super vitamin E really helps with keeping my skin looking plump; you can feel it working its magic right after applying. And let’s not skip over the hyaluronic acid—perfect for someone like me who battles dry patches in wintertime! This serum has just made my skincare routine so much easier and effective. If you’re into clean formulations that deliver results without harshness, this one’s definitely worth checking out!
Sofiane from Montreal, Canada –
Alright, let me tell you about this COSRX Vitamin C serum! Honestly, I’ve been using it for a few weeks now and my skin is feeling like a whole new canvas. You know how sometimes your face feels kinda blah? This stuff brightens everything up without being sticky or greasy—major plus in my book. Plus, it’s packed with that pure vitamin C goodness; I’m all about those antioxidants protecting me from everyday life. My dark spots are fading too—I can actually see the difference when I check myself out after I’ve done my skincare routine! If you’re hunting for something to get your glow back, give this baby a shot. No joke!
Zahra from Kuala Lumpur, Malaysia –
This COSRX serum is a game changer! My skin’s brighter and more hydrated after just a week. Love it!