I can’t tell you how much I love this. I use this in my night routine and I wake up looking like I had a spa facial the night before with no fail (I usually had taut and dull skin before using). I have a full, round face and 1-2 drops go a long way. A little on the pricey side but it cleared and made me a skip on a few items on my night regime!
In my experience, none at all. Although, I don’t recommend this for oily skin types since it leaves a residue the morning after. I also don’t recommend using this with any Vit. C serums you have since it will counter and clash with this product in terms of ingredients.