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

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!

Works well and the price is great compared to competition. Although the smell reminds me of the oil packets you get from insta ramen.

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.

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.

The media could not be loaded. I’ve only been using this serum for a week, so I can’t speak to the results yet but the smell is awful. It seriously reminds me of canned dog food (beef kind), and it’s hard to get past.Also, the packaging isn’t great.The first bottle arrived completely leaked and had to be returned. The replacement came quickly, but it still had a slight leak. Not sealed well, which is disappointing for a serum that oxidizes easily.

Yes the color, smell is a little weird but this is the real stuff that actually works not some processed junk.

I’d like you to meet officially my glow dealer. I put her on, and it’s like someone turned the brightness up on my face without making me look oily or fake — just pure, radiant, even skin.She’s lightweight, sinks in instantly, and doesn’t give me the dreaded sticky or stingy drama that so many vitamin C serums bring to the table. Within weeks, my dullness is GONE & my redness? Fading. My entire complexion? Smooth, even, and practically sparkling. I look like I’ve been sleeping eight hours and drinking green juice (spoiler: I haven’t).This isn’t just brightening — it’s transformative. My morning routine feels incomplete without her, and when I skip a day, I can tell. She’s will forever live in my mini fridge rent free.She’s the reason I’m glowing like I actually have my life together.

This product works great but has that nasty smell to it. I had to stop using it because the smell was making me gag. I have dry skin so I think if I would have continued using it, it really would have done some skin improvement for me, but I just couldn’t take the odor.