Very good for skin!!!!! I’m going to get buy more!!!!

It’s sooo good i feel my skin is more lightness 

Amazing vitamin C, very hydrating, fights pigmentation so well

I have been using Koreans beauty products for a couple years and this brand has never disappointed me. I have dry skin, & can counter this by layering something moisturizing - it's nice that this product provides the benefits of ascorbic acid but also provides moisture. I appreciate the addition of all the other antioxidants as well.

Cosrx has been a staple in my skincare as long as I have been using korean beauty products. This does not disappoint. My skin does tend to be on the oily side so I do not use as much of this as I should, but it's a keeper.

While I love ascorbic acid-containing vitamin c serums, they do tend to be a bit drying. I have dry skin, & can counter this by layering something moisturising - it's nice that this product provides the benefits of ascorbic acid but also provides moisture. I appreciate the addition of all the other antioxidants as well. This is absolutely perfect for my dry skin in dry Aussie summers when I need vitamin c & moisture at the same time.

My trusted vitamin C, effective yet gentle on the skin

I use it for month but its burn me a little Idk why

very good i recommend helped my skin. a little sticky 

Hands down best vitamin C so far for me, very effective

i've been use this serum for 2 weeks and i dont any negative effect on my skin. NO TINGLING, NO ITCHY, NO REDNESS or any other bad feeling. it's a bit sticky at the beginning but dissappear after i use moisturizer. i can feel the changes because my skin looks brighter and some acne scars dissappear too. overall i give 4.5 for this brilliant invention from @cosrx. for you who have been scrolling and looking for good vitamin C, i will highly recommend to try this serum for sure. you can get this product from your fave website or ecommerce to buy skincare.

以前も使って良かったから新しいもの買いました！レビューもいいし、好きです

初めて使ったけどとっても良かった！またリピートする予定です！！

I have oily/combination skin and used the Real Fit vitamin C for 5 months, using 5 to 6 drops per use (2 to 3 did not seem like enough) for 5 months every morning.

I love cosrx products and I wanted to use a nice vitamin c so I believe this will be what I need for my dull complexion. Ordered their niacinamide serum too to use together so will be uploading

I like this. It's very hydrating and soothing to my skin. I love this.

I love love love love love

This seems to work as my dark spots are fading slowly. My only concern is the packaging of this bottle. Vitamin C is an active ingredient and every time you open the bottle it oxidizes making it less effective after each use. Wished it had a pump instead of a dropper…

I am still finishing my old vitamin C serum so I still didnt use this one . I will update once i am able to use it.

This is very light and seems effective to me. Been using it for a month now.

the first THING that I notice

buying this the second time. brightens the skin tone, makes the skin kind of smooth also. absolutely no irritation but i did use other vit c product in the past. a real good product. the product didnt oxidise which is very nice; i did keep it in fridge to have the cool feeling on my face on summer days. the only thing i didnt like is the smell of vit C; very light smell but i did smell it on my face.

This is by far my favorite vitamin C it doesn’t oxides like other vitamin c I ordered twice for me and my sister and I really enjoyed it i use it in the morning under sunscreen and I’ve noticed less pigmentation

This serum helps brighten my face like most Vit C products. Toonaway 1 star because I don't really notice much changes to my skin except that it makes it a bit brighter.

Great affordable vitamin c serum.

Havnt used yet packing and product looks good

It’s was a good product and the ingredients also what I’m looking for so long it’s a must try product don’t for get to grab it when they have good price with good events

Great vitamin C serum, fades pigmentation very fast

Great serum, love it absolutely

Didn’t really do much for my skin