What are good products to improve the dermis of my skin?

Dermis. Since the production of procollagen must precede the production of collagen, vitamin c must have a role in this step. A compounded topical medication called vitamin c palmitate 30% is very effective at improving the collagen in the dermis. The oral vitamin c is not that effective.
Collagen production. The best treatment is retin a (tretinoin) as it stimulates collagen formation in the dermis.