@MiaL @sfbeautyxo I use the same Vitamin C, and am pretty happy with it. Haven't tried the retinol. I think I've read that it's ok if you use them at different times of the day, retinol being best at night and vit C in the morning .
I use the vitamin c serum every day under moisturiser, and retinol once a week. I don't use the vitamin c on the day I use the retinol serum x
I would also recommend Drunk Elephant x
Seen some goid reviews for elizabeth arden retinol capsules....they are suppise to be really good and wotk pretty much instantly. Not sure ifvthe give samples...you can always ask at counter