Re: vitamin c serum...
No worries Horizon. I'm actually not using Cellex-C myself. I've used Skin Ceuticals in the past which is good but sticky but am currently using Henry Tianus (organic brand) Antioxidant Youthful Essence which has 20% Vit C concentration along with other antioxidants. It's not widely available though, only via online or a couple of organic shops in London.
The Cellex C serum is called 'High Potency Serum' and it has 10% Vit C concentration. The highest concentration you can get in Vit C serums is 20%. Personally,