The Vitamin C 23 Serum with Super Vitamin E + Hyaluronic Acid

This vitamin c is wonderful. It’s recommended to be kept in the fridge and putting on this product cool is so refreshing. The consistency feels great and is well absorbed. The thing with skin care products is that only the first 5 ingredients really matter. 23% vitamin C is in the top 5.

Muy buen producto, lo uso hace mucho. Es excelente la concentración y textura.

I started with the cleanser and was so impressed that I ended up buying almost the entire COSRX line. The Advanced Snail Mucin Gel Cleanser leaves my skin feeling super clean without drying it out or making it feel tight. After seeing how well my skin reacted, I added the toner, snail cream, vitamin C serum, retinol, eye cream, and sunscreen to my routine — and every single product has been amazing. My skin feels smoother, more hydrated, brighter, and healthier overall. The snail mucin products especially give my skin such a soft glow, and the retinol/vitamin C combo has really helped improve texture and dark spots. The sunscreen is lightweight and doesn’t leave a white cast, which I love. Honestly, COSRX completely upgraded my skincare routine. My skin has never looked this good, and now I understand why so many people rave about this brand. Definitely worth every penny!

Great products highly recommended

Perfecta una vitamina para el rostro exelente producto

Love this vit c serum i use it daily

For $25, this is a pretty awesome and high performance serum. With 23% pure ascorbic acid, which is quite a high concentration, acid, it delivers serious antioxidant power and noticeable brightening. The formula is thoughtfully balanced with panthenol, allantoin, and silicones to buffer irritation, which helps make such a high concentration more tolerable. But still, I wouldn't use this as a vit c newbie due to the high concentration, but perhaps a serum to work up to! The texture is slightly oily due to the added plant oils and squalane, but it spreads easily and absorbs better than many high-strength vitamin C formulas. For my acne prone friends, this might also feel a bit heavier due to the included oils. It contains both fast and slow acting vit c (and a derivative) plus stabilizers, but with any vit c product, you can still expect it to oxidize eventually. I appreciate that it's in a dark bottle to slow that process down. I also keep it in the fridge to try to lengthen it's shelf life. Overall, it’s an impressively potent vitamin C serum for the price. If you're looking for results and can tolerate 23% vit c, give this a try!!!

Buen producto

Great job COSRX amazing I loved really

Great part of eye washing routine. Makes skin feel amazing after routine

I have ordered this a couple times. I applied daily with my moisturizer i like the feel of my skin afterward.

Good and feels hydrating

My favorite vitamin c serum, perfect for my skin. Little breakout.

Good skincare. Very useful. The vitamin c is pure.

nothing to complain

Great product

Excelente

A staple in my regimen

LA MEJOR VITAMINA C QUE HE PROBADO, supera la roche porsai, ademas tiene 23 . a mi no me irrita nada

The product was received

Help me to improve my skin 100%

Exelente, pero trae muy poco, la primera vez me alcanzó para 15 dias y la segunda compra comencé a poner menos cantidad, unas 6 gotitas en todo el rostro y no me alcanzó a durar ni un mes. Buena pero buscaré otra opción.

I like this product, but don't love it. I used Dr. Althea VitC serum before and really liked it. I made the switch to try something more "powerful". It is a bit runny and non-greasy. The skin feels ok after applying it, but sometimes (not always) I feel a burning sensation. I think it all depends on what you are looking for and your skin tolerance. This one seems more like a repair serum.

Es un producto de muy biena calidad, la verdad llevo usándola tiempo y no la cambio por otra.

Todo bien, llego en el tiempo que decía.. pensé que tardaría más. Original y en buenas condiciones.

Very effective for fading marks and discoloration. Gentle on skin, so good for daily use

Amazing vitamin c serum! Did not experience weird smell as other reviewers mentioned. Makes my skin look so glowy and beautiful

I like it

Excelente vitamina para la piel!!

I haven't taken this consistently enough to notice a change yet, so I am still waiting to produce before and after photo updates! I am pretty thrilled that this has glutathione in it, which is a decent antioxidant that we also produce internally to neutralize free radicals. It is supposedly also supposed to target and inhibit a certain enzyme, which in theory should help with skin tone. Hoping to clear up my skin and any patches.

By far the best Vitamin C serum I’ve ever used. I have been using this for about two years now and at 40, I think my skin looks better now than it did at 30. After using this, I started using a much lighter foundation, then changed to a tinted moisturizer, now, I don’t even wear foundation very much at all, I don’t need it!

I have been exploring Korean skincare for a long time now, and this high-concentration Vitamin C serum has quickly become a standout in my morning routine. It features a potent 23% pure Vitamin C, which is quite strong, so I was happy to find that it feels surprisingly gentle on my skin. The formula is a brilliant blend of Ascorbic Acid, Super Vitamin E, and Glutathione. These ingredients work together as an antioxidant powerhouse to fade pigmentation, smooth out fine lines, and really bring back that healthy radiance to a dull complexion. The texture is incredibly lightweight and non-greasy, sinking into the skin almost instantly. I love the hydrated finish it leaves behind, which makes my face look soft and firm without any of the stickiness I have experienced with other brands. It applies smoothly, and I have found it layers beautifully under my moisturizer and sunscreen without pilling. One thing to be very mindful of is the storage and handling of such a high percentage of Vitamin C. I keep my bottle in the refrigerator to prevent it from oxidizing, as it needs to remain a light straw color to stay effective. If it turns a dark orange, the potency is gone. I also recommend a quick shake before applying two or three drops. It is an affordable way to achieve that sought-after glass skin glow, though I would suggest a patch test first if you are new to stronger actives. COSRX Advanced Pure Vitamin C 23% Serum

Love this brand…it has really improved my skin care.

The best in skincare. Leaves skin smoother.

Nice it does the job great absorption

I started using this 2 weeks ago. I have always used Vitamin C, E and glutathione individually. Having it put together in one bottle is great. I just put a dropperful onto my face and it makes it feel wonderful. The texture and look of my skin has improved. It feels soft, smooth and firm. This product is not greasy and it's very lightweight. Sinks into your skin quickly.

This is a nice lightweight vitamin C serum. I have sensitive skin with rosacea and this doesn't irritate my skin at all. It absorbs well and quickly, it doesn't leave a sticky residue, and my skin feels hydrated and plump after using it. I really love k-beauty products, I feel like they always make my skin feel so much lighter and brighter. I do feel like my skin looks more glowy when I am using this regularly. Compared to some of the more pricey vitamin C products out there, I think this is a really great budget option.

Excelente calidad

Es buena.

I am new to Korean beauty and bought this to try after a recommendation from a dermatologist I follow on YouTube. I wasn’t expecting it to go on so beautifully and make my skin glow. I have very dry skin and am a golden tan color. Love layering this under my other serums in the morning. For the price, it’s worth trying to see if it works for you too. One tip the dermatologist recommended for purchasing any Vitamin C serum is that it needs to be the straw color that you will see this serum to be. Anything darker means the serum has “turned,” and the Vitamin C is no longer effective/active. Been using this a few weeks now, and the color has remained the consistent straw color. I will likely run out in the next few weeks and will absolutely buy this on repeat.

This line is fantastic I use it all and I feel such a difference

I just bought my second bottle of COSRX Vitamin C 23% Serum. The product itself is FENOMENAL. Hands down the best I have tried so far!! However, this second bottle came almost EMPTY (no product inside the bottle). It was sealed and no signs of leakage. Great product, but a ripoff.

I was very excited to try this vitamin C as I like the COSRX brand a lot and have many of their other products. The problem (for which I removed a star) is that is contains sunflower oil, and this breaks out my skin. I know it isn't high on the ingredient list, but I just wish they hadn't included out, because otherwise this is a very nice formulation and should be very effective on skin which can tolerate this high of a level of vitamin C. I keep mine in the fridge and decant a small amount into another bottle, this helps it last a long time. I like the inclusion of the Glutathione. It doesn't break me out too much, so I have kept using it. That said, I'm not sure I'm seeing a lot of difference in brightness and fading of dark spots.

I found this to be a quality vitamin C serum, on par with more expensive brands. One thing I didn’t realize however is that it requires refrigeration. That is admittedly something I don’t love as I can’t keep it with my other beauty items. That having been said, for the results the inconvenience of having to go to the kitchen during the facial routine may be worth it.

Best vitamin C serum I’ve ever used! I’ve tried so many, but this one truly stands out. You can actually see and feel a difference within two week. My skin is very sensitive and I use it every morning, and it doesn’t break me out at all. COSRX is my fav brand..absolutely love it!

I'll start by saying this is an excellent product with a very good quality percentage overall. In my first purchases, the results were genuinely impressive — I noticed radical, noticeable changes that made me a loyal customer. However, I have to be honest: my most recent orders have not lived up to that same standard. It feels like the product is no longer the same as it used to be, whether in formula, potency, or overall effectiveness. The difference is hard to ignore when you've experienced what it can actually do at its best.

I’ve been using this Vitamin C 23% for about two months and the results are incredible (Just got my second bottle). My skin tone is much more even, and my post-acne marks have faded significantly. At 37, my skin has never looked more radiant and smooth. It’s a powerful formula, so I recommend keeping it in the fridge to stay fresh. Highly recommend for that Korean 'glass skin' glow!

I’ve been buying this for years and all my other skincare products are medical grade. This actually works unlike some you buy that’s already oxidized. 1) when you open it it smells like fish (anything good stinks lol 2) it’s YELLOW and towards the end of the bottle turns orange. It even says to use within 2 months. Best overall vitamin c especially for the price.

Good product

Excelente producto y vendedor