Best best best. I love it sooo muchhh

was skeptical at first but this product works wonders & does exactly what it says it’s going to!! i’m happier with my skin now and can wear other foundations.

I saw dermatologist recommended this serum

I recommend this vitamin c serum it’s very good for blemish skin and anti aging

Vitamin C is always a miss for me for some reason. I love Cosrx so I wanted to give this one a try but for some reason I feel like it gives me more red spots. Not sure if my skin is just sensitive to vitamin c or I still haven’t found one for me.

Recommended for those who wish to have smooth and bright skin. This serum can help. Highly recommended!

I have no idea how it's work. I got order from customer.

Bought it for someone I know hasn't tried it yet

I have really enjoyed using this serum! Cosrx has such effective formulas and this ia definitely one of them! I would recommend this serum!

I love it since it doesn’t make my skin irritated. And it adsorption perfectly into the skin, doesn’t not feel sticky at all.

★ 13% Pure Vitamin C, Super Vitamin E & Allantoin
 –a beginner friendly vitamin c serum. mild and sensitive skin would enjoy this. it contains hyaluronic acid which hydrates the skin at the same time while brightening the skin. the texture is very watery than the high concentrated vitamin C serum of cosrx. It doesn't leave any stickiness and absorbs well. I notice that most of my dark spots got lessen. Its too early to say that my acne marks are already gone but its slowly doing its job for that case.

I love it very good one 13% of pure vitamin c help me a lot with dark spot

I thought it would sting, but it didn’t sting at all, low irritation in my sensitive skin. My dark spot under my nose are fading faster, i am very satisfied. I think I will continue to use this serum and someday try a higher percentage version from cosrx. This Vitamin C serum that must be tried for dull & dark spot skin.

Để nói về công dụng của vitamin C thì em nó có công dụng làm mờ sẹo mụn,vết thâm,cải thiện sắc tố da,làm đều màu da…Và với chiết xuất 13% vitamin C tinh khiết thì em này rất thích hợp cho những bạn mới sử dụng và làm quen với vitamin C giống như mình và hoàn toàn có thể dùng hàng ngày sau bước toner. Lần đầu sử dụng thì tớ có cảm giác châm chích nhẹ nhưng đến lần thứ 2 thì hết hoàn toàn.Cảm giác em nó thấm khá nhanh và dễ chịu trên da.Sau khoảng 14 ngày sử dụng thì có cảm nhận da sáng lên đôi chút nhưng không quá rõ ràng và có lẽ sau khi dùng hết em 13 này mình sẽ nâng lên em 23

Cosrx The Vitamin C 13 Serum - highly concentrated 13% Pure Vitamin C stabilized formula that has Super Vitamin E & Hyaluronic Acid. This Vitamin C 13 Serum fades scars & hyperpigmentation, brightens dull skin and helps reduce fine lines & wrinkles. This serum works on sensitive skin with little to no irritation. Apply a few drops to clean face with fingers and tap to absorb, follow with SPF. This serum is lightweight but it does take awhile to absorb. Serum must be stored in the refrigerator.

Good good gooooooddddd gooodddd

It’s light weight, yellow serum, absorbs easily & does wonders for my skin This is a great Vit C serum, and at a lower percentage, it’s great for those that want to try out C & see what goodness it can bring to their skin. Packaging is perfect, a dark bottle to help protect the active, sealed with a cap you take off & replace with the included dropper when you’re ready to start using it. They include a thorough explanation sheet as well! Do yourself a favor & store this in the fridge, to delay oxidization. It will last you about 2 months after opening before it starts to lose effectiveness, about how long it takes to use it. So perfect! Start with just a couple drops, go from there. I’ve had zero irritation, and use about 4 drops, just to avoid any tackiness you may get if you use more product. Honestly I’m ok with that, since it goes away after a bit.

All Day Vitamin Pure C5.5   This was the most potent serum out of the 3 with 5.5% Ascorbic Acid as well as alpha arbutin  which help dark spots and hyperpigmentation. l used this every day in my morning routine and it worked well that way.The serum was very runny and lightweight .It wasn’t super hydrating but it did brighten my complexion and make it glowy. I didn’t experience any irritation and it’s a decent everyday vitamin C serum .I would just use with caution as it can be irritating to some skin types that are sensititive to ascorbic acid .Also there is only a 3PAO which makes me worried I won’t finish it in time.

I also have oily skin and I refrain from using serums in the morning or afternoon because it might get humid later. I tried using this Vitamin C 13 serum and I was so happy that it lightened my skin tone and I can use it before wearing sunscreen without feeling oily or sticky. 

With 13% pure vitamin C derivative (Ascorbic Acid) has the ability to gently clean, remove dead cells, dry, dull, dark skin on the surface, making skin smooth and bright. Bright and even color, fade dark spots after only 2 weeks. + Allantoin, Niacinamide: regenerating, promoting collagen synthesis, moisturizing. + B5 and Adenosine should help reduce irritation caused by high concentrations of vitamin C, restore and give skin a healthy, smooth glow. My feelings: - Because of the high concentration of vitamin C, the texture will be quite sticky on the face. Plus, it takes a long time to absorb. - I found the product to have a very good skin lightening effect. It takes about 2 weeks (and I only use it every morning) to see it fade away, the results are very noticeable. I also did a fun test with a bruise on my shin to see how long it took, maybe a little longer, but I did see an improvement in pigmentation in those areas. In general, after experiencing it, I strongly recommend it to

This formula is light-weight and slightly oily. It doesn't feel oily or heavy on the skin, it absorbs quite fast. It contains 13% Vitamin C and it did not irritate my skin. Vitamin C helps to improve skin tone, improve wrinkles, acne scars and brighten skin overtime. Once opened use within 2 months.

Good for nourishing as it has vutamin c good gor glowing and brightening

This serum contains 13% pure vitamin C and has a liquid texture that feels pleasant on my skin. It is effective in reducing the appearance of dark spots and blemishes, while also making my skin brighter and improving its texture, leaving it feeling smooth and soft. The formula is mild and suitable for daily use, making it a great addition to my daily skincare routine.

I only used this every morning, it's a lightweight and non greasy serum that helps my acne marks slowly fading. Since this is a vitamin serum, I'm glad that it doesn't irritate my skin. I try to put it on refrigerator to maintain the freshness of Vitamin C.

Lightweight texture, although sometimes it leaves a sticky feeling. Besides that, I´ve noticed my skin more luminous and with even skin tone. It´s great! <3

this vitamin C is gentle. I normally have issues with vitamin C as my skin doesn’t react well to it, but I have no issue with this form.

This is the second bottle with the lowest % of vitamin C from my previous vitamin C that I have tried from COSRX. I love how it's gentle enough on my sensitive skin, works well without stinging or irritating my skin at all. I noticed that my skin looked way healthier and brighter than before. Definitely repurchase this vitamin C! No alcohol, no fragrance, no essential oil, slightly comedogenic

When it was first opened, the pipette and tube were separated, so it was safer from oxidation. The color of the texture when it was opened was slightly yellow, but that was because it was fresh vitamin C. The texture was watery and not sticky. It contains 13% ascorbic acid (the most active and pure form of vit C), hyaluronic acid (moist and hydrated), allantoin (soothes), super vitamin E (improves the appearance of fine lines and wrinkles). I thought it would sting, but it didn’t sting at all, low irritation in my sensitive skin. My dark spot under my nose are fading faster, i am very satisfied. I think I will continue to use this serum and someday try a higher percentage version from cosrx.