I have dry skin and sometimes it's sensitive, so I wouldn't put it on my face again and I didn't see any improvement. However, using it 1-2 times a week as a deodorant does a great job!

just started to use it a week ago. No skin irritation, no issues until now, but I'm using it on my legs to help exfoliate my "strawberry legs", so I'm not using it in a sensitive area. I'll buy it again unless I will find something that works better than this, in a bigger quantity and at better price.

I was very hesitant to buy this particular product because every time I have used glycolic acid, it hasn't worked well for me. However, this one pleasantly surprised me.
I used the toner on my face, heels, elbows, hair due to dry skin, and certain areas of my hands where I have eczema.
(Note: it is a strong ingredient, especially if you are inexperienced, use it on problematic areas at your own risk. I also did some experiments).
Especially on my scalp and hands, the results were noticeable from the first week itself, while for each area mentioned above, I have bought product after product with no results.
It may seem expensive, but I have been using it daily on some of these areas since I bought it in April '23, and there are still 4-5 uses left for sure in the bottle.
It is worth every euro cent and can be used in many other ways as well.
If you search on the internet, you will find what suits you.

I have oily skin prone to acne. The pimples stopped appearing immediately. The skin cleared up within a week. I apply it every night and then apply a moisturizer, and in the morning, I definitely need a sunscreen. I was very satisfied because it finally got rid of my pimples.