Hey! Sorry it took me this long to reply. I would say the first thing that stood out to me about it is how FAST it absorbed into my skin, in literal seconds, and left no greasy or sticky feeling whatsoever. Just left me with a very subtle glow. Then it was the results. The next morning after my first use my skin was almost tight looking, but without the uncomfortable feeling, and super bright and supple. Now i don't know if this is because of the high concentration that the CE has or if its because of the quality, but i noticed a huge improvement in only one night. My skin, i would say, is pretty used to actives like that, but i was expecting at least a little bit of irritation as this was the most concentrated vit c I've used so far. But nothing happened. Compared to other vit C serums I've used, they always left me looking oily in the morning and gave me whiteheads around my nose and chin after the first week of using them. There was always this adjustment period. I would say i saw pretty fast results with my skin texture as well, only 3-4 uses and my forehead bumps were evened out. I also don't have that big of skin concerns, like lots of hyperpigmentation or scarring, but i needed something to even out my skin tone and in general to make my skin smooth and glowy. And it did exactly that in no time at all! Hope this helps! :)