You're very welcome. These threads are my guilty pleasure.
My Skinceuticals sample arrived just before I came on holiday so I haven't tried it yet. Not sure I can remember where I put it.
I brought the Allies of Skin Vit C away with me to try. It's quite a high % and my skin has been tolerating it but it's a very sticky texture and I need to apply it on top of another serum otherwise it won't spread without dragging. Given it's an expensive one I'm not sure I will repurchase this one when it's done.