Patchcollection review for Perfectionist Pro Rapid Brightening Treatment with Ferment² + Vitamin C

Took a few months of daily usage (applied 2 pumps every morning on my face) and just finished up a 30ml bottle. I can honestly say that this very expensive product did absolutely nothing for my skin. My skin did not brigthen nor did the sunspots or post acne marks fade away -- not that this serum also did not cause my skin to break out of dry out my skin. After I used up the 30ml, I moved onto using othet serums (kbeauty brands that are much cheaper in price) and my skin looks exactly the same as while I was using the Estee Lauder serum. I will not be repurchasing.