COSRX Pure Vitamin C 23% Serum with Vitamin E & Hyaluronic Acid, Hydrating Facial Serum for Fine Lines, Uneven Skin Tone & Dull Skin, 0.7oz/20g, Korean Skin Care

I’ve only used this product for a few days, but I can already tell a difference, which is crazy. As soon as I put it on, it gave me an instant glow—not oily, greasy mess kind of glow, but the healthy, plump kind of glow. As someone who had beautiful skin during pregnancy, but is now struggling with uneven and dull skin tone postpartum, this made me extremely happy. Anyway, here are my initial thoughts: Formulation: •this contains a high ascorbic acid percentage. I’ve never been sensitive to ascorbic acid, so my skin does well with the high concentration. However, if you have more sensitive skin, consider starting with their other vitamin c serum that has a lower percentage of vitamin c. •there is no ferulic acid present, which is generally used to stabilize ascorbic acid. Without this, I’m afraid the product won’t last terribly long without oxidizing, so keep this in mind. The instructions do say to refrigerate after opening, which may help slow down oxidation. Texture: The texture of this serum reminds me of a bi-fácil product where there is an oil layer and water layer that need a little shake to incorporate. Don’t let the oiliness scare you though, it does sink in to the skin well and doesn’t feel heavy on the skin. I haven’t had any issues with pilling when I’ve applied other products and makeup on top. Smell: As many reviewers have mentioned, it does have a particular smell to it. To me, it reminds me of tuna, which is quite unpleasant. However, it does dissipitate quickly. I just hold my breath while I apply it to my face XD I don't smell it at all throughout the day.

This serum works really well. It also is affordable . The only complaint I have is that it smells terrible. Thank goodness the smell dissipates almost immediately. It does the job though and it's makes my skin brighter.

I've been a huge fan of Cosrx products. I originally had used the lower strength of vitamin c and upgraded to this one a few months back. I feel that it does work in terms of discoloration, but for some reason this one makes me break out more than other vitamin c products I've used. I'm going to finish up what I have left of this bottle but I think I'll go back to the lower strength. My only complaint with the Cosrx vitamin c is how small the bottles are. It could be because vitamin c doesn't last long in terms of potency once opened, but it's a bit pricey for such a small bottle. You definitely have to keep it in the fridge and the smell is strange and not very pleasant but goes away shortly after application. I have not noticed any stinging or irritation from this higher strength vitamin c, but like I said, I have noticed acne break outs happening a bit more than before. My recommendation...give it a shot if you've already used the lower strength and feel you need more potency, but beware of potential break outs.

First time with this brand, but using Vit C serum for years. So far one of my favorites in the range of price. Smells uncomfortable fishy but that is the Vit C normal smell, after some seconds over the skin the smell is gone, and personally prefer this than any extra essence. The oil is pretty thin and absorbs immediately. Haven't had any reactions but I have quite of time with this VitC concentration. I like how my skin looks, give me a glossy renewed look every morning. Any result with dark spots or fine lines, but I realized that is normal aging and nothing to do with it lol, anyway my skin looks healthy and younger for my age. Totally happy with this brand in my second week of use. Update: one month of use and still love it!

I’m extremely disappointed with this purchase. I just received and opened this Vitamin C serum today, and it already appears to be oxidized. The liquid is noticeably darker than the product images, and it has a strong rancid/oily smell (the kind of unpleasant “old oil” odor). This is not what a fresh Vitamin C serum should smell or look like. Vitamin C is highly unstable, and once oxidized, its effectiveness drops significantly. If the serum arrives already oxidized, it raises serious concerns about storage conditions, shelf life, or whether old inventory is being shipped out — especially to subscription customers. I ordered this expecting a fresh, effective product, not something that smells off and looks aged on day one. Completely unacceptable quality control. I will be returning/refunding and will not continue the subscription.

First, let me address the smell. I actually lost my taste and smell in 2020 and never fully got it back, so I had no clue this even had such a foul odor. I happened to stumble across the reviews, so I am quite amused simply because I was thinking my cat was wanting to spend quality “mommy and me” time every day while I was at the sink. However, now I am thinking it’s because she thought she was getting tuna 😂 JK, she likes to open my drawers and get hair ties in the bathroom, so I know she genuinely does want me for something. Now, regarding the oil: I love CosRx products, get regular skincare treatments (facials, chemical peels, etc.), follow some dermatologists and other non MD influencers on social media and all that fun stuff. In other words, skincare is important to me, so I don’t choose products that I put on my face willy nilly. I am about to order my second bottle, because I love this oil- I only use it a few times per week, but even then, it agreed with my skin, it is helping with my overall uneven skin pigmentation (it’s a slow process, so don’t expect overnight results), and it is more affordable than other brands out there.

脂性敏感肌です。リニューアル前のと比べると圧倒的に使いやすくなりました！！（匂いや使用感）肌が敏感になっている時は、ピリピリするので塗布する量や肌の状態に気をつけた方がいと思います！！！1〜2滴だとベタベタするのと匂いが少しあった。ベタつきが気になったので、0.5くらいの少量だけ塗ることにしました！匂いもZEROではない！ 毛穴が小さくなったり、肌が明るくなる！という目に見えた効果は私は感じられませんが、未来の肌への投資ということで使い続けています✌🏻( ᵔᢦᵔ )5本以上リニューアル前から使ってます（肌が薄い方や体質の方は感じられると思います）

its kinda of sticky, but it does good to my skin. I dont rub it but just tap it to my face, every other day.

Very good product well worth the money and very fast delivery

بنات ما يسوى ابدا تاخذون شي مو موثوق لانه رخيص وتعالجون بشرتكم لشهور اولا ريحته كريهة جدا كانها ريحة فاصوليا معلبة بدون مبالغة وهذا الشي كان ممكن يكون محتمل لو انه منتج فعال سبب لي حبوب حمراء اول مره اشوفها بوجهي وقعدت اعالجها لفترة، بشرتي دهنية طبعا استخدمت تونر من نفس الشركة وبرضو ماهو احسن منه، بس متأكدة ان هذا السيروم سبب الحبوب لاني حسيت الحبوب خفت بعد ما وقفته حتى مع استمراري على التونر كان يحرق كمان مع اني سويت اختبار على رقبتي وقلت ممكن طبيعي بما انه فيتامين سي انا ما اعرف اذا المنتج مو اصلي او مكوناته ما ناسبتني بس عموما ما يسوى تعيشين بهالقلق بعدوا عنه احسن

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.