On the positive side, it does what it promises; with systematic use, it brightens the skin and nothing more!
On the negative side,
Its price is outrageous and is only justified if you live in 2005 when it first came out; for 2025, it is nothing compared to other products with much better results and clearly at 1/10th of the price! You are simply paying for the patent from 20 years ago! This particular serum does not have a stabilized form of vitamin C, resulting in it oxidizing very easily and becoming useless!! While there are countless formulas with ethyl ascorbic acid + derivatives with far better results and without irritation! In my opinion, do not waste your money on this under any circumstances!
Very good companies with much better results and clearly much cheaper are: medik8 pure c 15 and the best dupe of skinceuticals is from geek and gorgeous!
Identical ingredients and almost the same pH at €13 and the results are identical

I bought it because I had read extremely positive reviews. I wasn't impressed by the result after using the entire package. I should note that this is a significantly more expensive product compared to similar ones. Perhaps, it requires a longer application period to see something special as a result.

My dermatologist gave me a sample of the product and I was thrilled! So far, whatever I tried from other budget-friendly brands didn't make any difference, with this one I realized how great vitamin C is for the skin! Unfortunately, it is very expensive and only 30 ml.

This product from this particular company is gold for the skin.
It's no coincidence that it's the number one product. It's expensive but worth every penny of it 100%!!!

Excellent product! I apply it after face cleansing and before day cream! I would buy it again.

It is a truly multifunctional solution. It contains 15% pure VitC, 1% E, and the Ferulic acid, which is the gold here. Now, regarding the price. Even if it costs 30 to 50 to produce, if we consider the fact that it is the only product that is stabilized and has 50 years of research, then I believe you start to see it in a different light. Of course, I cannot fail to mention the wonderful scent it has. I give credit to the company for making great products.

Amazing product. It does what it promises and I would buy it again. Overall, all products from this company are very good. They are worth their money.

Overall, this company is the best! I have 3 products from them, the C sunscreen and glycolic acid cleanser, there is nothing better! With the first application! The downside..... It is an expensive company.