# COSRX - The Vitamin C 23 Serum **Brand:** COSRX **Category:** Soins du visage **Code (GTIN/SKU):** 8809598454651 **Canonical URL:** https://openreviews.io/en/reviews/cosrx/cosrx-the-vitamin-c-23-serum-8809598454651 ## Rating: 4.7/5 ★★★★★ — 115 reviews analyzed _Confidence: high_ ## At a glance COSRX - The Vitamin C 23 Serum reviews: 4.7/5 based on 115 analyzed reviews from 3 sites, updated October 27, 2026. Praised: scent and sensation / usage. Criticized: peculiar scent and sensitivity and storage. - Scent: 25 reviews mention it, mostly positively - Sensation / Usage: 11 reviews mention it, mostly positively - Formula / Texture: 9 reviews mention it, mostly positively 115 reviews analyzed: 70 published on OpenReviews and 45 on other sites. Other sites: 2 sources, 45 reviews, average rating 4.6/5. How we count reviews: https://openreviews.io/en/methodology ## AI summary This concentrated vitamin C serum is highly praised for its effectiveness in brightening the complexion, reducing pigmentation, and its hydrating effect. Its texture spreads easily and absorbs well into the skin, offering a radiant finish that is highly appreciated by users. A few users note a slightly sticky sensation upon application and mild tingling on sensitive skin. Additionally, its surprising initial scent, although fleeting, and the requirement to store it in a cool place may displease some. ## Strengths - Scent (36%) - Sensation / Usage (16%) - Formula / Texture (13%) - Price (11%) - Appearance (7%) ## Weaknesses - **Peculiar scent** — The product emits a strong and unique initial odor, which fortunately fades after application. - **Sensitivity and storage** — Its powerful formula can tingle sensitive skin and requires mandatory storage in the refrigerator. ## Frequently asked questions - What does this serum smell like? - Can it be used on sensitive skin? - Does it absolutely have to be kept in the fridge? - Does it leave a sticky finish on the face? ## Top reviews ### 5.0/5 · Isabelpoizen · October 2, 2025 Siero con alta percentuale di vitamina C, sulla mia pelle pizzica un pochino dopo l’applicazione, ma è normale per il tipo di prodotto. Ha l’odore tipico di tutti i sieri con alta percentuale di vitamina C, che non a tutti piace, ma per i risultati che si ottengono, si può tranquillamente sopportare. Contiene anche acido ialuronico e vitamina E, che ha azione antiossidante. Prodotto ottimo, come tutti i prodotti coreani che non si battono.Dopo l’applicazione la pelle è subito luminosa e morbida. Ovviamente una volta aperto, si conserva in frigorifero, per evitare che gli attivi si degradino. ### 5.0/5 · Nadia.E · October 1, 2025 Ça reste pour moi l indispensable à avoir, je ne peux plus m’en passer.Réduit les cicatrices d’acné, illumine la peau, l’acide hyaluronique fait que ça hydrate vraiment la peau.Je rachèterai sans hésitation! ### 5.0/5 · HARNOIS DOMINIQUE · October 1, 2025 Perfect ### 5.0/5 · Yam · September 24, 2025 Très bon serum, efficace. ### 5.0/5 · Very beautiful · September 19, 2025 Beautiful ### 5.0/5 · gbenedictis · September 11, 2025 Very good ### 5.0/5 · C**** T**** · September 9, 2025 bonne vita c ### 5.0/5 · Anthony Poland · July 30, 2025 Very good product well worth the money and very fast delivery ### 5.0/5 · tr · July 24, 2025 I’ve been using this Vitamin C serum daily in the morning, and I’m honestly impressed with the results. My skin looks noticeably brighter and more even-toned after just a couple of weeks. It gives a subtle glow and helps wake up my complexion—perfect before sunscreen and makeup.The texture is lightweight and absorbs quickly without feeling sticky or greasy, which is a huge plus. It layers well with the rest of my routine and hasn’t caused any breakouts or irritation (and I have oily, acne-prone skin).The only thing I’d mention is the scent—it’s mild but slightly citrusy, which didn’t bother me but might be noticeable to some. Overall, this serum has become a staple in my morning skincare routine, and I’d definitely repurchase. ### 5.0/5 · Milica Sovilj · July 14, 2025 I have been using the COSRX Pure Vitamin C Serum with Vitamin E for a while now and I really love it. At first, I noticed it has a slightly weird smell. It is not unpleasant but definitely unique compared to other serums I have tried. Once you get used to the smell, it is no longer a problem.What I really like is how it feels on the skin. The texture is very lightweight and it absorbs quickly without leaving any sticky or greasy feeling. It gives my skin a fresh and real sensation as if it is doing something beneficial deep down rather than just sitting on the surface.Since using this serum regularly I have noticed that my skin looks brighter and more even toned. It feels softer and smoother. The added Vitamin E helps with hydration and nourishes my skin. I also appreciate that it does not irritate my skin even though it can be sensitive sometimes so it is gentle yet effective.Overall despite the odd smell at first the performance of this serum makes it totally worth it. It feels like a high quality product that works well and I would definitely recommend it to anyone looking to improve their skincare routine with a Vitamin C serum that actually delivers results. --- _Source: OpenReviews — https://openreviews.io/en/reviews/cosrx/cosrx-the-vitamin-c-23-serum-8809598454651_