I have only just started using this, so too early to see significant difference as yet. Bought it to compliment environ AVST 5 which I’ve been using for years. I can see the fine lines starting to creep in at 49, so with help from the knowledgeable advisors, I have added Vit C into my routine. I put on first, followed by AVST. I’d normally need an extra moisturiser with AVST, but using the Vit C, I don’t have to if I don’t want to as the Vit C moisturises enough. Will continue to use Environ as great high end products!