I used the whole bottle. I mainly got it to see if it would help me at all with acne but I didn't see any significant difference. Yes, it does have a bit of a smell but it's not bothersome and it goes away afterwards. You don't need a large amount because it won't absorb quickly if you want to do other steps before makeup. Yes, my face became brighter but I don't know if I would buy it again.

It changed my face, made it more radiant and with a sculpted look, I use it quite often and I highly recommend it.

I used it all and I didn't see any significant difference in discolorations and spots. Also, the dropper is not convenient. Serums that have a dispenser are better. I will also remove a star because I bought it in November for about 13 euros and now with all the advertising it has reached up to 50 euros!! Every time we look for it, the price seems to go up... One would say it contains gold inside and not vitamin C!

I've been using it for a month..... I am 42 years old and I read that I should include vitamin C in my routine. Personally, I haven't seen any difference. I think the Estee Lauder serum I used was better, it was just extremely expensive and didn't have vitamin C. On the plus side, it absorbs quickly. The smell is indeed bad, but it disappears almost immediately and you don't notice it.

Very watery, like water. Smells like fish. I don't see any glow on my face and I can say that I am very consistent with my morning routine. I apply it before the moisturizer from the same company and then sunscreen. I would not buy it again

I have only used it twice so I don't have an opinion on its effectiveness and unfortunately I won't form one because it smells so bad that I feel like I've spread rotten meat fat on myself.

I am not going to buy it again nor use it again.

I used it at night for about two weeks and the result was that I broke out in acne. Closed comedones and small cysts that took many days to subside. Besides that, its texture is incredibly sticky and the smell is unacceptable, but at least it faded over time. Needless to say, I will not buy it again.

Best vitamin C serum I have tried in recent years. Like every serum, it works best when accompanied by a proper skin care routine, diet, and habits.

Use only in winter due to the vitamin A it contains. It may cause irritation during the summer months

The skin's appearance changes. It becomes brighter, softer, and smoother!!! I have been using it for 6 months. I am very satisfied with the result!!!

I think it's the best, with the highest vitamin C content, it doesn't smell nice but I read that it's supposed to be like that! I would buy it again!

I have a mild form of rosacea. I wear it every other night in case the vitamin C irritates my skin. From the first day, my face glows and my skin is smoother

Love it, perfect quality but bare in mind its really strong percentage, not for sensitive skin. I use it every second night i see the diference. Scent is strange like barbeque, which is normal because it contains ferulic acid. Very happy i would buy it again.

I am 38, my skin becomes like cotton!! From the very first use. I haven't seen a difference in wrinkles, but for the texture of the skin it gets a 5

it neither has a sticky feeling nor a strange smell.. as for its effectiveness, I'm not sure because I don't use it on a daily basis. the high content of vit c is a positive element.

Guys, I don't know what's up with those who made this and those who keep buying it, but this thing smells like CAT FOOD!

I didn't use it much because I happened to get a tattoo on my eyebrows and it's not suitable. It ruins the tattoo. Its smell is terrible but fortunately it goes away after a while

It is oily and I only used it at night. I have oily skin and I noticed that it gives me small pimples, meaning it clogs my pores. I wouldn't mind anything if it did what it promises, but I see the dark spots appearing normally, just like every spring with the sun :( I will try some cream next time and another serum.

I have acne-prone skin. Not active acne, but I am very sensitive to breaking out from products, pillowcases, my children's hands, etc. It does what it promises. I recommend it!! I immediately saw a difference in the old acne marks and a more flawless complexion!! I am very satisfied. Ideally, I combine it with a moisturizer that also has healing-whitening properties and it works wonders!

I've been wearing it for 5 days, it leaves the skin smooth and matte from the first use. The makeup applies better and I've already seen a difference in the pores!

You can see the difference in the skin from the first application. Be careful to store it in the fridge and always apply sunscreen. Update: the best I've tried in vitamin C. I love it!

I have already bought it 3 times! Amazing product! It moisturizes the skin very well! It has become essential for me!

I have found it difficult to pump from the tube... unless it finished in a month! I am at one month of use.

Today I received the product, from the very first use it seemed like a very good condition! It leaves a very nice soft feeling! I felt my skin tightening and giving it a brightness! I feel satisfied with the product, I will return in a month to see if some signs of hyperpigmentation will decrease!

Wonderful product! It has a very light scent and its texture is fluid. The skin glows after using it, I've been using it for 2 years now and I won't change it. It requires hand washing immediately after application like all Vitamin C products.

Really a best seller and not without reason. It may not smell nice upon application, but that is temporary. No true serum with vitamin C smells nice. The product deeply hydrates, soothes the skin, and makes it elastic. I combine it with the beauty of Joseon cream in the morning and they are wonderful together

It is not heavy at all and has a nice feel. It leaves the skin very soft and I had no irritation at all. However, I did not notice any other change in my skin, neither in the spots nor in the brightness.

In contrast to the 13%, it feels noticeably heavier and stickier. Also, I didn't have the glow and effectiveness of the 13%, I won't buy it again, too oily a texture for my combination skin.

I have combination to oily skin, yet it doesn't leave any shine. I noticed a difference in my pores within the first 10 days. Very good, it delivers on its promises, that's why I bought a second bottle.